{"id":1189,"date":"2025-03-24T08:52:39","date_gmt":"2025-03-23T23:52:39","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1189"},"modified":"2025-03-24T08:52:39","modified_gmt":"2025-03-23T23:52:39","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91jackson%e5%85%a5%e9%96%80-2024%ef%bc%9ajava%e9%96%8b%e7%99%ba%e8%80%85%e3%81%ae%e3%81%9f%e3%82%81%e3%81%ae%e5%ae%9f%e8%b7%b5%e7%9a%84json%e5%87%a6%e7%90%86","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1189","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Jackson\u5165\u9580 2024\uff1aJava\u958b\u767a\u8005\u306e\u305f\u3081\u306e\u5b9f\u8df5\u7684JSON\u51e6\u7406\u30ac\u30a4\u30c9 10\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">Jackson \u3068\u306f\uff1f\u6700\u65b0\u306e Java JSON \u51e6\u7406\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u7406\u89e3\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">Java \u306e\u30c7\u30d5\u30a1\u30af\u30c8\u6a19\u6e96\u3068\u306a\u3063\u305fJackson \u306e\u7279\u5fb4\u3068\u6ce8\u76ee<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">2024 \u5e74\u6700\u65b0\u306e Jackson \u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u4e3b\u8981\u306a\u6a5f\u80fd<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">Jackson \u5c0e\u5165\u304b\u3089 Hello World \u307e\u3067\u306e\u624b\u9806<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">Maven\/Gradle \u3067\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u8ffd\u52a0\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u57fa\u672c\u7684\u306aObjectMapper\u306e\u8a2d\u5b9a\u3068\u521d\u671f\u5316<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30b7\u30f3\u30d7\u30eb\u306aJSON\u5909\u63db\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5b9f\u8df5\u7684\u306aJSON\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">POJO\u3068JSON\u306e\u76f8\u4e92\u5909\u63db\u306e\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u30fb\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u30d9\u30b9\u30c8\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">\u65e5\u4ed8\u3084\u6642\u523b\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">\u9ad8\u5ea6\u306aJackson\u6a5f\u80fd\u306e\u6d3b\u7528\u8853<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">JsonNode\u3092\u4f7f\u7528\u3057\u305f\u52d5\u7684\u306aJSON\u51e6\u7406<\/a>      <\/li>      <li>        <a href=\"#i-13\">JSON\u30d1\u30b9\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-14\">\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0API\u3092\u4f7f\u7528\u3057\u305f\u5927\u898f\u6a21\u306aJSON\u306e\u51e6\u7406<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-15\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-17\">\u4e00\u822c\u7684\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3068\u5bfe\u7b56\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u51e6\u7406\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u9ad8\u5ea6\u306a\u30d2\u30f3\u30c8\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">\u5faa\u74b0\u53c2\u7167\u306e\u89e3\u6c7a\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-21\">\u591a\u614b\u6027\u306e\u51e6\u7406\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-23\">Spring Framework\u3068Jackson\u306e\u9023\u643a<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-24\">Spring Boot\u3067\u306eJackson\u8a2d\u5b9a\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/a>      <\/li>      <li>        <a href=\"#i-25\">RESTful API\u3067\u306eJackson\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-26\">\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3068\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-27\">2024\u5e74\u306b\u304a\u3051\u308bJackson\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b910\u9078<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-28\">\u8a2d\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-29\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-30\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-31\">\u305d\u306e\u4ed6\u306e\u91cd\u8981\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-32\">Jackson \u306e\u4ee3\u66ff\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u6bd4\u8f03<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-33\">Gson \u3068 Jackson \u306e\u6a5f\u80fd\u6bd4\u8f03<\/a>      <\/li>      <li>        <a href=\"#i-34\">JSON-B \u3068\u306e\u4f7f\u3044\u5206\u3051<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-35\">\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u6700\u9069\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u691c\u8a0e\u57fa\u6e96<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">Jackson \u3068\u306f\uff1f\u6700\u65b0\u306e Java JSON \u51e6\u7406\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u7406\u89e3\u3059\u308b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">Java \u306e\u30c7\u30d5\u30a1\u30af\u30c8\u6a19\u6e96\u3068\u306a\u3063\u305fJackson \u306e\u7279\u5fb4\u3068\u6ce8\u76ee<\/h3>\n\n\n\n<p>Jackson \u306f\u3001Java \u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3044\u3066\u6700\u3082\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b JSON \u51e6\u7406\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002Spring Framework \u3084 Apache Hadoop \u306a\u3069\u3001\u591a\u304f\u306e\u4e3b\u8981\u306a\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u306e JSON \u30d7\u30ed\u30bb\u30c3\u30b5\u3068\u3057\u3066\u63a1\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u4e8b\u5b9f\u4e0a\u306e\u6a19\u6e96\uff08\u30c7\u30d5\u30a1\u30af\u30c8\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\uff09\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u4e3b\u8981\u306a\u7279\u5fb4\u306b\u3088\u308a\u3001Jackson \u306f\u591a\u304f\u306e\u958b\u767a\u8005\u304b\u3089\u652f\u6301\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9ad8\u5ea6\u306a\u67d4\u8edf\u6027<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u30d9\u30fc\u30b9\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/li>\n\n\n\n<li>\u8c4a\u5bcc\u306a\u8a2d\u5b9a\u30aa\u30d7\u30b7\u30e7\u30f3<\/li>\n\n\n\n<li>\u62e1\u5f35\u53ef\u80fd\u306a\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u512a\u308c\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u4f7f\u7528<\/li>\n\n\n\n<li>\u9ad8\u901f\u306a\u51e6\u7406\u901f\u5ea6<\/li>\n\n\n\n<li>\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0 API \u306e\u30b5\u30dd\u30fc\u30c8<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8c4a\u5bcc\u306a\u6a5f\u80fd\u30bb\u30c3\u30c8<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\uff08POJO\u3068JSON\u306e\u76f8\u4e92\u5909\u63db\uff09<\/li>\n\n\n\n<li>\u30c4\u30ea\u30fc\u30e2\u30c7\u30eb\uff08JsonNode\uff09\u306b\u3088\u308b\u52d5\u7684\u51e6\u7406<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6<\/li>\n\n\n\n<li>\u65e5\u4ed8\/\u6642\u523b\u5f62\u5f0f\u306e\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li>\u591a\u69d8\u306a\u30c7\u30fc\u30bf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30b5\u30dd\u30fc\u30c8\uff08JSON, XML, YAML, CSV \u306a\u3069\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">2024 \u5e74\u6700\u65b0\u306e Jackson \u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u4e3b\u8981\u306a\u6a5f\u80fd<\/h3>\n\n\n\n<p>\u73fe\u5728\u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\uff082024\u5e744\u6708\u6642\u70b9\uff09\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u304c\u8ffd\u52a0\u30fb\u6539\u5584\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<p><strong>1. \u30b3\u30a2\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u9032\u5316<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u524a\u6e1b<\/li>\n\n\n\n<li>Java 21 \u3068\u306e\u5b8c\u5168\u306a\u4e92\u63db\u6027<\/li>\n\n\n\n<li>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306e\u30cd\u30a4\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5f37\u5316<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8106\u5f31\u6027\u5bfe\u7b56\u306e\u5f37\u5316<\/li>\n\n\n\n<li>\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u653b\u6483\u304b\u3089\u306e\u4fdd\u8b77\u6a5f\u80fd<\/li>\n\n\n\n<li>\u5165\u529b\u691c\u8a3c\u306e\u6539\u5584<\/li>\n<\/ul>\n\n\n\n<p><strong>3. \u65b0\u6a5f\u80fd\u3068\u6539\u5584\u70b9<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ 1. \u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306e\u30b5\u30dd\u30fc\u30c8\npublic record Person(String name, int age) {}\n\nObjectMapper mapper = new ObjectMapper();\nString json = mapper.writeValueAsString(new Person(\"John\", 30));\n\n\/\/ 2. \u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u306e\u30b5\u30dd\u30fc\u30c8\nJsonNode node = mapper.readTree(json);\nObject value = switch (node.getNodeType()) {\n    case STRING -&gt; node.asText();\n    case NUMBER -&gt; node.asInt();\n    default -&gt; throw new IllegalArgumentException(\"Unexpected value\");\n};\n\n\/\/ 3. Virtual Properties\uff08\u8a08\u7b97\u3055\u308c\u305f\u5024\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09\npublic class Product {\n    private double price;\n    private double taxRate;\n\n    @JsonProperty  \/\/ \u81ea\u52d5\u7684\u306b\u8a08\u7b97\u3057\u3066 JSON \u306b\u542b\u3081\u308b\n    public double getTotalPrice() {\n        return price * (1 + taxRate);\n    }\n}<\/pre>\n\n\n\n<p><strong>4. \u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306e\u62e1\u5145<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spring Framework \u3068\u306e\u7d71\u5408\u5f37\u5316<\/li>\n\n\n\n<li>\u30af\u30e9\u30a6\u30c9\u30cd\u30a4\u30c6\u30a3\u30d6\u74b0\u5883\u3067\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3078\u306e\u9069\u5fdc<\/li>\n<\/ul>\n\n\n\n<p>Jackson \u306e\u63a1\u7528\u4e8b\u4f8b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5927\u898f\u6a21\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30b7\u30b9\u30c6\u30e0<\/strong>: \u91d1\u878d\u6a5f\u95a2\u3001E\u30b3\u30de\u30fc\u30b9<\/li>\n\n\n\n<li><strong>\u30af\u30e9\u30a6\u30c9\u30b5\u30fc\u30d3\u30b9<\/strong>: AWS\u3001GCP \u3068\u306e\u9023\u643a<\/li>\n\n\n\n<li><strong>\u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9<\/strong>: Spring Boot \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/li>\n\n\n\n<li><strong>\u30c7\u30fc\u30bf\u5206\u6790<\/strong>: Apache Hadoop\u3001Spark \u3068\u306e\u7d71\u5408<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u7279\u5fb4\u3068\u6700\u65b0\u6a5f\u80fd\u306b\u3088\u308a\u3001Jackson \u306f\u5f15\u304d\u7d9a\u304d Java \u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3051\u308b JSON \u51e6\u7406\u306e\u6700\u6709\u529b\u9078\u629e\u80a2\u3067\u3042\u308a\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u3001\u9ad8\u5ea6\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4e21\u7acb\u3001\u3055\u3089\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u3067\u306e\u7d99\u7d9a\u7684\u306a\u6539\u5584\u306f\u3001\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u4fa1\u5024\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">Jackson \u5c0e\u5165\u304b\u3089 Hello World \u307e\u3067\u306e\u624b\u9806<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">Maven\/Gradle \u3067\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u8ffd\u52a0\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067Jackson\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u9069\u5207\u306a\u4f9d\u5b58\u95a2\u4fc2\u3092\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6700\u3082\u4e00\u822c\u7684\u306a\u8a2d\u5b9a\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>Maven \u306e\u5834\u5408\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;dependencies&gt;\n    &lt;!-- Jackson \u30b3\u30a2\u30e2\u30b8\u30e5\u30fc\u30eb --&gt;\n    &lt;dependency&gt;\n        &lt;groupId&gt;com.fasterxml.jackson.core&lt;\/groupId&gt;\n        &lt;artifactId&gt;jackson-databind&lt;\/artifactId&gt;\n        &lt;version&gt;2.16.0&lt;\/version&gt;\n    &lt;\/dependency&gt;\n\n    &lt;!-- \u65e5\u4ed8\u6642\u523b\u30e2\u30b8\u30e5\u30fc\u30eb\uff08\u5fc5\u8981\u306b\u5fdc\u3058\u3066\uff09 --&gt;\n    &lt;dependency&gt;\n        &lt;groupId&gt;com.fasterxml.jackson.datatype&lt;\/groupId&gt;\n        &lt;artifactId&gt;jackson-datatype-jsr310&lt;\/artifactId&gt;\n        &lt;version&gt;2.16.0&lt;\/version&gt;\n    &lt;\/dependency&gt;\n&lt;\/dependencies&gt;<\/pre>\n\n\n\n<p><strong>Gradle \u306e\u5834\u5408\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">dependencies {\n    implementation 'com.fasterxml.jackson.core:jackson-databind:2.16.0'\n    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.16.0'\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u57fa\u672c\u7684\u306aObjectMapper\u306e\u8a2d\u5b9a\u3068\u521d\u671f\u5316<\/h3>\n\n\n\n<p>ObjectMapper \u306f Jackson \u306e\u4e2d\u5fc3\u7684\u306a\u30af\u30e9\u30b9\u3067\u3001JSON\u5909\u63db\u306e\u307b\u3068\u3093\u3069\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u4e00\u822c\u7684\u306a\u521d\u671f\u5316\u3068\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import com.fasterxml.jackson.databind.ObjectMapper;\nimport com.fasterxml.jackson.databind.SerializationFeature;\nimport com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;\n\npublic class JacksonConfig {\n    public static ObjectMapper createObjectMapper() {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ \u57fa\u672c\u8a2d\u5b9a\n        mapper.configure(SerializationFeature.INDENT_OUTPUT, true);  \/\/ \u6574\u5f62\u3055\u308c\u305fJSON\u51fa\u529b\n        mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);  \/\/ \u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8a31\u53ef\n\n        \/\/ Java 8 \u65e5\u4ed8\/\u6642\u523b\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u767b\u9332\n        mapper.registerModule(new JavaTimeModule());\n        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);\n\n        return mapper;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30b7\u30f3\u30d7\u30eb\u306aJSON\u5909\u63db\u306e\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<p>\u57fa\u672c\u7684\u306aJSON\u306e\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u3092\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306b\u3001\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u64cd\u4f5c\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ POJO\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9\npublic class User {\n    private String name;\n    private int age;\n    private LocalDate birthDate;\n\n    \/\/ getter\/setter\uff08\u7701\u7565\uff09...\n}\n\npublic class JacksonDemo {\n    public static void main(String[] args) throws Exception {\n        ObjectMapper mapper = JacksonConfig.createObjectMapper();\n\n        \/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089JSON\u3078\u306e\u5909\u63db\uff08\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09\n        User user = new User();\n        user.setName(\"\u5c71\u7530\u592a\u90ce\");\n        user.setAge(30);\n        user.setBirthDate(LocalDate.of(1994, 1, 1));\n\n        String json = mapper.writeValueAsString(user);\n        System.out.println(\"\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u7d50\u679c:\");\n        System.out.println(json);\n\n        \/\/ JSON\u304b\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u5909\u63db\uff08\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09\n        String inputJson = \"\"\"\n            {\n                \"name\": \"\u9234\u6728\u82b1\u5b50\",\n                \"age\": 25,\n                \"birthDate\": \"1999-12-31\"\n            }\n            \"\"\";\n\n        User parsedUser = mapper.readValue(inputJson, User.class);\n        System.out.println(\"\\n\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u7d50\u679c:\");\n        System.out.println(\"\u540d\u524d: \" + parsedUser.getName());\n        System.out.println(\"\u5e74\u9f62: \" + parsedUser.getAge());\n        System.out.println(\"\u751f\u5e74\u6708\u65e5: \" + parsedUser.getBirthDate());\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u7d50\u679c:\n{\n  \"name\" : \"\u5c71\u7530\u592a\u90ce\",\n  \"age\" : 30,\n  \"birthDate\" : \"1994-01-01\"\n}\n\n\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u7d50\u679c:\n\u540d\u524d: \u9234\u6728\u82b1\u5b50\n\u5e74\u9f62: 25\n\u751f\u5e74\u6708\u65e5: 1999-12-31<\/pre>\n\n\n\n<p>\u521d\u671f\u6bb5\u968e\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u554f\u984c\u3068\u89e3\u6c7a\u7b56\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u30a8\u30e9\u30fc<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u554f\u984c: getter\/setter\u304c\u306a\u3044<\/li>\n\n\n\n<li>\u89e3\u6c7a: <code>@JsonProperty<\/code> \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001\u30a2\u30af\u30bb\u30b5\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u65e5\u4ed8\u5f62\u5f0f\u306e\u30a8\u30e9\u30fc<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u554f\u984c: \u65e5\u4ed8\u5f62\u5f0f\u306e\u5909\u63db\u30a8\u30e9\u30fc<\/li>\n\n\n\n<li>\u89e3\u6c7a: JavaTimeModule \u306e\u767b\u9332\u3068\u9069\u5207\u306a\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u672a\u77e5\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u30a8\u30e9\u30fc<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u554f\u984c: JSON\u306b\u5b58\u5728\u3057\u306a\u3044\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u3042\u308b<\/li>\n\n\n\n<li>\u89e3\u6c7a: <code>mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u8a2d\u5b9a\u3068\u5b9f\u88c5\u4f8b\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001Jackson\u3092\u4f7f\u7528\u3057\u305fJSON\u51e6\u7406\u306e\u57fa\u790e\u3092\u7fd2\u5f97\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u6a5f\u80fd\u3084\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5b9f\u8df5\u7684\u306aJSON\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">POJO\u3068JSON\u306e\u76f8\u4e92\u5909\u63db\u306e\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>Jackson\u3067\u306f\u3001POJO\u3068JSON\u306e\u76f8\u4e92\u5909\u63db\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u305f\u3081\u306e\u69d8\u3005\u306a\u6a5f\u80fd\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5b9f\u8df5\u7684\u306a\u624b\u6cd5\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6d3b\u7528\u3057\u305f\u67d4\u8edf\u306a\u30de\u30c3\u30d4\u30f3\u30b0<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import com.fasterxml.jackson.annotation.*;\n\n@JsonInclude(JsonInclude.Include.NON_NULL)  \/\/ null\u5024\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\npublic class Employee {\n    private Long id;\n\n    @JsonProperty(\"full_name\")  \/\/ JSON \u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u3092\u5909\u66f4\n    private String fullName;\n\n    @JsonIgnore  \/\/ \u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u304b\u3089\u9664\u5916\n    private String internalNote;\n\n    @JsonFormat(pattern = \"yyyy-MM-dd\")  \/\/ \u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a\n    private LocalDate joinDate;\n\n    \/\/ getter\/setter\uff08\u7701\u7565\uff09...\n}<\/pre>\n\n\n\n<p><strong>2. \u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u69cb\u9020\u306e\u51e6\u7406<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Department {\n    private String name;\n\n    @JsonManagedReference  \/\/ \u5faa\u74b0\u53c2\u7167\u306e\u5236\u5fa1\n    private List&lt;Employee&gt; employees;\n\n    @JsonUnwrapped  \/\/ \u30cd\u30b9\u30c8\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d5\u30e9\u30c3\u30c8\u5316\n    private Location location;\n}\n\npublic class Location {\n    private String city;\n    private String country;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u30fb\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u30d9\u30b9\u30c8\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u5909\u63db\u3084\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u542b\u3080\u5834\u5408\u3001\u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u304c\u6709\u7528\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MoneySerializer extends JsonSerializer&lt;Money&gt; {\n    @Override\n    public void serialize(Money value, JsonGenerator gen, \n                         SerializerProvider serializers) throws IOException {\n        gen.writeStartObject();\n        gen.writeNumberField(\"amount\", value.getAmount());\n        gen.writeStringField(\"currency\", value.getCurrency().getCurrencyCode());\n        gen.writeEndObject();\n    }\n}\n\n@JsonSerialize(using = MoneySerializer.class)\npublic class Money {\n    private BigDecimal amount;\n    private Currency currency;\n    \/\/ ... \u305d\u306e\u4ed6\u306e\u30b3\u30fc\u30c9\n}<\/pre>\n\n\n\n<p><strong>2. \u30ab\u30b9\u30bf\u30e0\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u5b9f\u88c5\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MoneyDeserializer extends JsonDeserializer&lt;Money&gt; {\n    @Override\n    public Money deserialize(JsonParser p, DeserializationContext ctxt) \n            throws IOException {\n        JsonNode node = p.getCodec().readTree(p);\n\n        BigDecimal amount = new BigDecimal(node.get(\"amount\").asText());\n        Currency currency = Currency.getInstance(node.get(\"currency\").asText());\n\n        return new Money(amount, currency);\n    }\n}\n\n@JsonDeserialize(using = MoneyDeserializer.class)\npublic class Money {\n    \/\/ ... \u524d\u8ff0\u306e\u30b3\u30fc\u30c9\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u65e5\u4ed8\u3084\u6642\u523b\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\u65b9\u6cd5<\/h3>\n\n\n\n<p>Java 8\u4ee5\u964d\u306e\u65e5\u4ed8\u6642\u523bAPI\u3068\u306e\u9023\u643a\u306b\u3064\u3044\u3066\u3001\u5b9f\u8df5\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u57fa\u672c\u7684\u306a\u65e5\u4ed8\u6642\u523b\u306e\u51e6\u7406<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Event {\n    @JsonFormat(pattern = \"yyyy-MM-dd HH:mm:ss\")\n    private LocalDateTime startTime;\n\n    @JsonFormat(shape = JsonFormat.Shape.STRING)\n    private LocalDate eventDate;\n\n    @JsonFormat(timezone = \"Asia\/Tokyo\")\n    private ZonedDateTime timestamp;\n}<\/pre>\n\n\n\n<p><strong>2. \u30ab\u30b9\u30bf\u30e0\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u9069\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class DateTimeConfig {\n    public static ObjectMapper configureObjectMapper(ObjectMapper mapper) {\n        JavaTimeModule module = new JavaTimeModule();\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u767b\u9332\n        module.addSerializer(LocalDate.class, new LocalDateSerializer(\n            DateTimeFormatter.ofPattern(\"yyyy\/MM\/dd\")));\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u767b\u9332\n        module.addDeserializer(LocalDateTime.class, \n            new LocalDateTimeDeserializer(\n                DateTimeFormatter.ofPattern(\"yyyy\/MM\/dd HH:mm:ss\")));\n\n        mapper.registerModule(module);\n        return mapper;\n    }\n}<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8003\u616e\u4e8b\u9805<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306f\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u3068\u3057\u3066\u5b9f\u88c5<\/li>\n\n\n\n<li>\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306b\u8a2d\u8a08<\/li>\n\n\n\n<li>\u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306f\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0API\u306e\u4f7f\u7528\u3092\u691c\u8a0e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@JsonDeserialize(using = CustomDeserializer.class)\npublic class CustomDeserializer extends JsonDeserializer&lt;MyObject&gt; {\n    @Override\n    public MyObject deserialize(JsonParser p, DeserializationContext ctxt) \n            throws IOException {\n        try {\n            \/\/ \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u51e6\u7406\n        } catch (Exception e) {\n            throw new JsonParseException(p, \"\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u30a8\u30e9\u30fc: \" + e.getMessage());\n        }\n    }\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u7d71\u5408<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ValidatedDeserializer extends JsonDeserializer&lt;UserData&gt; {\n    private final Validator validator = Validation.buildDefaultValidatorFactory()\n                                                .getValidator();\n\n    @Override\n    public UserData deserialize(JsonParser p, DeserializationContext ctxt) \n            throws IOException {\n        UserData userData = \/\/ \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u51e6\u7406\n\n        Set&lt;ConstraintViolation&lt;UserData&gt;&gt; violations = validator.validate(userData);\n        if (!violations.isEmpty()) {\n            throw new JsonParseException(p, \"\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc: \" + violations);\n        }\n\n        return userData;\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5805\u7262\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044JSON\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306aJackson\u6a5f\u80fd\u306e\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">\u9ad8\u5ea6\u306aJackson\u6a5f\u80fd\u306e\u6d3b\u7528\u8853<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">JsonNode\u3092\u4f7f\u7528\u3057\u305f\u52d5\u7684\u306aJSON\u51e6\u7406<\/h3>\n\n\n\n<p>JsonNode\u306f\u3001JSON\u306e\u69cb\u9020\u3092\u52d5\u7684\u306b\u51e6\u7406\u3059\u308b\u969b\u306b\u5f37\u529b\u306a\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u7279\u306b\u3001\u5b9f\u884c\u6642\u307e\u3067JSON\u69cb\u9020\u304c\u78ba\u5b9a\u3057\u306a\u3044\u5834\u5408\u3084\u3001\u67d4\u8edf\u306a\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u6709\u7528\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>1. JsonNode\u306e\u57fa\u672c\u64cd\u4f5c<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class JsonNodeExample {\n    public static void main(String[] args) throws Exception {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ JSON\u6587\u5b57\u5217\u304b\u3089JsonNode\u3092\u751f\u6210\n        String jsonStr = \"\"\"\n            {\n                \"name\": \"\u88fd\u54c1A\",\n                \"price\": 1000,\n                \"details\": {\n                    \"color\": \"\u8d64\",\n                    \"size\": \"M\",\n                    \"features\": [\"\u9632\u6c34\", \"\u8efd\u91cf\"]\n                }\n            }\n            \"\"\";\n\n        JsonNode rootNode = mapper.readTree(jsonStr);\n\n        \/\/ \u5024\u306e\u53d6\u5f97\n        String name = rootNode.get(\"name\").asText();\n        int price = rootNode.get(\"price\").asInt();\n\n        \/\/ \u30cd\u30b9\u30c8\u3055\u308c\u305f\u5024\u306e\u53d6\u5f97\n        JsonNode detailsNode = rootNode.get(\"details\");\n        String color = detailsNode.get(\"color\").asText();\n\n        \/\/ \u914d\u5217\u306e\u51e6\u7406\n        ArrayNode featuresNode = (ArrayNode) detailsNode.get(\"features\");\n        featuresNode.forEach(feature -&gt; \n            System.out.println(\"\u7279\u5fb4: \" + feature.asText()));\n\n        \/\/ \u52d5\u7684\u306a\u30ce\u30fc\u30c9\u306e\u4f5c\u6210\u3068\u66f4\u65b0\n        ObjectNode newNode = mapper.createObjectNode();\n        newNode.put(\"name\", \"\u65b0\u88fd\u54c1\");\n        newNode.put(\"price\", 2000);\n\n        \/\/ \u65e2\u5b58\u30ce\u30fc\u30c9\u306e\u66f4\u65b0\n        ((ObjectNode) rootNode).set(\"updated\", newNode);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">JSON\u30d1\u30b9\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9<\/h3>\n\n\n\n<p>JSONPath\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306aJSON\u69cb\u9020\u304b\u3089\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u62bd\u51fa\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import com.jayway.jsonpath.JsonPath;\n\npublic class JsonPathExample {\n    public static void main(String[] args) {\n        String json = \"\"\"\n            {\n                \"store\": {\n                    \"books\": [\n                        {\n                            \"title\": \"Java\u5165\u9580\",\n                            \"price\": 2000\n                        },\n                        {\n                            \"title\": \"Python\u57fa\u790e\",\n                            \"price\": 1800\n                        }\n                    ]\n                }\n            }\n            \"\"\";\n\n        \/\/ \u7279\u5b9a\u306e\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u306e\u62bd\u51fa\n        List&lt;String&gt; expensiveBooks = JsonPath\n            .read(json, \"$.store.books[?(@.price &gt; 1900)].title\");\n\n        \/\/ \u914d\u5217\u5185\u306e\u7279\u5b9a\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\n        String firstBookTitle = JsonPath\n            .read(json, \"$.store.books[0].title\");\n\n        \/\/ \u8907\u6570\u306e\u5024\u306e\u96c6\u8a08\n        Integer totalPrice = JsonPath\n            .read(json, \"$.store.books[*].price.sum()\");\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0API\u3092\u4f7f\u7528\u3057\u305f\u5927\u898f\u6a21\u306aJSON\u306e\u51e6\u7406<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u306aJSON\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u3001\u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0API\u306e\u4f7f\u7528\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StreamingExample {\n    public static void processLargeJson(InputStream input) throws IOException {\n        JsonFactory factory = new JsonFactory();\n        JsonParser parser = factory.createParser(input);\n\n        \/\/ \u30c8\u30fc\u30af\u30f3\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u51e6\u7406\n        while (parser.nextToken() != JsonToken.END_OBJECT) {\n            String fieldName = parser.getCurrentName();\n            if (\"items\".equals(fieldName)) {\n                \/\/ \u914d\u5217\u306e\u958b\u59cb\u3092\u691c\u51fa\n                if (parser.nextToken() == JsonToken.START_ARRAY) {\n                    while (parser.nextToken() != JsonToken.END_ARRAY) {\n                        \/\/ \u5404\u8981\u7d20\u306e\u51e6\u7406\n                        processArrayElement(parser);\n                    }\n                }\n            }\n        }\n        parser.close();\n    }\n\n    private static void processArrayElement(JsonParser parser) throws IOException {\n        \/\/ \u8981\u7d20\u306e\u51e6\u7406\u30ed\u30b8\u30c3\u30af\n        if (parser.getCurrentToken() == JsonToken.START_OBJECT) {\n            ObjectMapper mapper = new ObjectMapper();\n            JsonNode node = mapper.readTree(parser);\n            \/\/ \u30ce\u30fc\u30c9\u306e\u51e6\u7406...\n        }\n    }\n}<\/pre>\n\n\n\n<p><strong>\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class BufferedProcessingExample {\n    private static final int BUFFER_SIZE = 1000;\n\n    public static void processWithBuffer(InputStream input) throws IOException {\n        List&lt;JsonNode&gt; buffer = new ArrayList&lt;&gt;(BUFFER_SIZE);\n        JsonParser parser = new JsonFactory().createParser(input);\n\n        while (parser.nextToken() != null) {\n            if (buffer.size() &gt;= BUFFER_SIZE) {\n                processBuffer(buffer);\n                buffer.clear();\n            }\n            \/\/ \u30d0\u30c3\u30d5\u30a1\u306b\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\n            JsonNode node = new ObjectMapper().readTree(parser);\n            buffer.add(node);\n        }\n\n        \/\/ \u6b8b\u308a\u306e\u30d0\u30c3\u30d5\u30a1\u3092\u51e6\u7406\n        if (!buffer.isEmpty()) {\n            processBuffer(buffer);\n        }\n\n        parser.close();\n    }\n\n    private static void processBuffer(List&lt;JsonNode&gt; buffer) {\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u5185\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u62ec\u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u9ad8\u5ea6\u306a\u6a5f\u80fd\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u67d4\u8edf\u306aJSON\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u51e6\u7406\u3084\u3001\u52d5\u7684\u306aJSON\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u304c\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>Jackson\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryOptimizedProcessor {\n    public void processLargeFile(File inputFile) throws IOException {\n        JsonFactory factory = new JsonFactory();\n        try (JsonParser parser = factory.createParser(inputFile)) {\n            \/\/ \u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u306e\u6700\u9069\u5316\n            parser.setRequestPayloadLimit(8192);  \/\/ 8KB\n\n            \/\/ \u30c8\u30fc\u30af\u30f3\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\n            while (parser.nextToken() != null) {\n                \/\/ \u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u51e6\u7406\n                if (parser.getCurrentName() != null &amp;&amp; \n                    parser.getCurrentName().equals(\"targetField\")) {\n                    processTargetField(parser);\n                    \/\/ \u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u306f\u30b9\u30ad\u30c3\u30d7\n                    parser.skipChildren();\n                }\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<p><strong>2. \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u518d\u5229\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ObjectPoolExample {\n    private final ObjectMapper mapper;\n    private final ObjectReader reader;\n    private final ObjectWriter writer;\n\n    public ObjectPoolExample() {\n        this.mapper = new ObjectMapper();\n        \/\/ \u7279\u5b9a\u306e\u578b\u7528\u306eReader\u3068Writer\u3092\u4e8b\u524d\u306b\u4f5c\u6210\n        this.reader = mapper.readerFor(DataType.class);\n        this.writer = mapper.writerFor(DataType.class);\n    }\n\n    public DataType readValue(String json) throws IOException {\n        return reader.readValue(json);\n    }\n\n    public String writeValue(DataType data) throws IOException {\n        return writer.writeValueAsString(data);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u4e00\u822c\u7684\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3068\u5bfe\u7b56\u65b9\u6cd5<\/h3>\n\n\n\n<p>Jackson\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u4e3b\u8981\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3068\u3001\u305d\u306e\u5bfe\u7b56\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u653b\u6483\u3078\u306e\u5bfe\u7b56<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SecureObjectMapper extends ObjectMapper {\n    public SecureObjectMapper() {\n        super();\n        \/\/ \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30c3\u30af\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306e\u7121\u52b9\u5316\n        this.deactivateDefaultTyping();\n\n        \/\/ \u4fe1\u983c\u3067\u304d\u308b\u30af\u30e9\u30b9\u306e\u307f\u3092\u8a31\u53ef\n        this.activateDefaultTyping(\n            new DefaultBaseTypeLimitingValidator(\n                Arrays.asList(\n                    \"com.example.trusted.\",\n                    \"java.util.ArrayList\"\n                )\n            )\n        );\n\n        \/\/ \u672a\u77e5\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u62d2\u5426\n        this.configure(\n            DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, \n            true\n        );\n    }\n}<\/pre>\n\n\n\n<p><strong>2. \u5165\u529b\u691c\u8a3c\u306e\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ValidatedDeserializer&lt;T&gt; extends JsonDeserializer&lt;T&gt; {\n    private final Class&lt;T&gt; targetClass;\n    private final Validator validator;\n\n    public ValidatedDeserializer(Class&lt;T&gt; targetClass) {\n        this.targetClass = targetClass;\n        this.validator = Validation.buildDefaultValidatorFactory()\n                                 .getValidator();\n    }\n\n    @Override\n    public T deserialize(JsonParser p, DeserializationContext ctxt) \n            throws IOException {\n        \/\/ \u57fa\u672c\u7684\u306a\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\n        T value = p.getCodec().readValue(p, targetClass);\n\n        \/\/ \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\n        Set&lt;ConstraintViolation&lt;T&gt;&gt; violations = validator.validate(value);\n        if (!violations.isEmpty()) {\n            throw new JsonMappingException(p, \n                \"\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc: \" + violations);\n        }\n\n        return value;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u51e6\u7406\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b\u305f\u3081\u306e\u4e3b\u8981\u306a\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u8a2d\u5b9a\u306e\u6700\u9069\u5316<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class OptimizedMapper {\n    public static ObjectMapper create() {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u8a2d\u5b9a\n        mapper.configure(\n            DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, \n            false\n        );\n        mapper.configure(\n            SerializationFeature.CLOSE_CLOSEABLE, \n            false\n        );\n\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u306e\u6700\u9069\u5316\n        mapper.getFactory().configure(\n            JsonGenerator.Feature.FLUSH_PASSED_TO_STREAM, \n            false\n        );\n\n        return mapper;\n    }\n}<\/pre>\n\n\n\n<p><strong>2. \u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class AsyncProcessor {\n    private final ObjectMapper mapper;\n    private final ExecutorService executor;\n\n    public AsyncProcessor() {\n        this.mapper = new ObjectMapper();\n        this.executor = Executors.newFixedThreadPool(\n            Runtime.getRuntime().availableProcessors()\n        );\n    }\n\n    public CompletableFuture&lt;String&gt; processAsync(Object data) {\n        return CompletableFuture.supplyAsync(() -&gt; {\n            try {\n                return mapper.writeValueAsString(data);\n            } catch (JsonProcessingException e) {\n                throw new CompletionException(e);\n            }\n        }, executor);\n    }\n}<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u304d\u306aJSON\u306e\u90e8\u5206\u7684\u306a\u51e6\u7406<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u306e\u56de\u907f<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5165\u529b\u30c7\u30fc\u30bf\u306e\u691c\u8a3c<\/li>\n\n\n\n<li>\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u5236\u9650<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u5236\u9650\u306e\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u975e\u540c\u671f\u51e6\u7406\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6226\u7565\u7684\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff08\u907f\u3051\u308b\u3079\u304d\u5b9f\u88c5\uff09\npublic void badPractice() {\n    ObjectMapper mapper = new ObjectMapper(); \/\/ \u6bce\u56de\u751f\u6210\u306f\u975e\u52b9\u7387\n    mapper.enableDefaultTyping(); \/\/ \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\n    mapper.configure(Feature.AUTO_CLOSE_SOURCE, true); \/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\n}\n\n\/\/ \u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\n@Singleton\npublic class BestPractice {\n    private final ObjectMapper mapper;\n\n    public BestPractice() {\n        this.mapper = new ObjectMapper()\n            .configure(Feature.AUTO_CLOSE_SOURCE, false)\n            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u3067\u9ad8\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306aJSON\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u9ad8\u5ea6\u306a\u30d2\u30f3\u30c8\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u5faa\u74b0\u53c2\u7167\u306e\u89e3\u6c7a\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u5faa\u74b0\u53c2\u7167\u306f\u5b9f\u52d9\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u554f\u984c\u306e\u4e00\u3064\u3067\u3059\u3002\u9069\u5207\u306a\u51e6\u7406\u65b9\u6cd5\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u30b9\u30bf\u30c3\u30af\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u9632\u304e\u3064\u3064\u3001\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u305f\u89e3\u6c7a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Department {\n    private String name;\n\n    @JsonManagedReference\n    private List&lt;Employee&gt; employees;\n}\n\npublic class Employee {\n    private String name;\n\n    @JsonBackReference\n    private Department department;\n}<\/pre>\n\n\n\n<p><strong>2. \u30ab\u30b9\u30bf\u30e0\u53c2\u7167\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CustomReferenceHandler {\n    private static ObjectMapper createMapperWithCustomReference() {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4f5c\u6210\n        SimpleModule module = new SimpleModule();\n        module.addSerializer(Department.class, new DepartmentSerializer());\n        mapper.registerModule(module);\n\n        return mapper;\n    }\n}\n\nclass DepartmentSerializer extends JsonSerializer&lt;Department&gt; {\n    @Override\n    public void serialize(Department dept, JsonGenerator gen, \n                         SerializerProvider provider) throws IOException {\n        gen.writeStartObject();\n        gen.writeStringField(\"name\", dept.getName());\n\n        \/\/ \u5f93\u696d\u54e1\u60c5\u5831\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\n        gen.writeArrayFieldStart(\"employees\");\n        for (Employee emp : dept.getEmployees()) {\n            gen.writeStartObject();\n            gen.writeStringField(\"id\", emp.getId());\n            gen.writeStringField(\"name\", emp.getName());\n            gen.writeEndObject();\n        }\n        gen.writeEndArray();\n\n        gen.writeEndObject();\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u591a\u614b\u6027\u306e\u51e6\u7406\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u7d99\u627f\u95a2\u4fc2\u306e\u3042\u308b\u30af\u30e9\u30b9\u3092\u6b63\u3057\u304f\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308b\u305f\u3081\u306e\u5b9f\u88c5\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@JsonTypeInfo(\n    use = JsonTypeInfo.Id.NAME,\n    include = JsonTypeInfo.As.PROPERTY,\n    property = \"type\"\n)\n@JsonSubTypes({\n    @JsonSubTypes.Type(value = Dog.class, name = \"dog\"),\n    @JsonSubTypes.Type(value = Cat.class, name = \"cat\")\n})\npublic abstract class Animal {\n    private String name;\n    \/\/ getter\/setter\n}\n\npublic class Dog extends Animal {\n    private String barkSound;\n    \/\/ getter\/setter\n}\n\npublic class Cat extends Animal {\n    private String meowSound;\n    \/\/ getter\/setter\n}\n\n\/\/ \u4f7f\u7528\u4f8b\npublic class PolymorphicExample {\n    public void processAnimals() throws JsonProcessingException {\n        ObjectMapper mapper = new ObjectMapper();\n\n        List&lt;Animal&gt; animals = Arrays.asList(\n            new Dog().setName(\"\u30dd\u30c1\").setBarkSound(\"\u30ef\u30f3\"),\n            new Cat().setName(\"\u30bf\u30de\").setMeowSound(\"\u30cb\u30e3\u30fc\")\n        );\n\n        String json = mapper.writeValueAsString(animals);\n        List&lt;Animal&gt; deserialized = mapper.readValue(json,\n            new TypeReference&lt;List&lt;Animal&gt;&gt;() {});\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u672a\u77e5\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u30a8\u30e9\u30fc<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a8\u30e9\u30fc\ncom.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: \nUnrecognized field \"newField\" not marked as ignorable\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd51: \u30af\u30e9\u30b9\u30ec\u30d9\u30eb\u3067\u8a2d\u5b9a\n@JsonIgnoreProperties(ignoreUnknown = true)\npublic class UserData {\n    \/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u5b9a\u7fa9\n}\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd52: ObjectMapper\u8a2d\u5b9a\nObjectMapper mapper = new ObjectMapper()\n    .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);<\/pre>\n\n\n\n<p><strong>2. \u578b\u5909\u63db\u30a8\u30e9\u30fc<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a8\u30e9\u30fc\ncom.fasterxml.jackson.databind.exc.InvalidFormatException: \nCannot deserialize value of type `java.time.LocalDate`\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd5: \u30ab\u30b9\u30bf\u30e0\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u5b9f\u88c5\npublic class FlexibleDateDeserializer extends JsonDeserializer&lt;LocalDate&gt; {\n    private static final List&lt;DateTimeFormatter&gt; FORMATTERS = Arrays.asList(\n        DateTimeFormatter.ISO_LOCAL_DATE,\n        DateTimeFormatter.ofPattern(\"yyyy\/MM\/dd\"),\n        DateTimeFormatter.ofPattern(\"MM\/dd\/yyyy\")\n    );\n\n    @Override\n    public LocalDate deserialize(JsonParser p, DeserializationContext ctxt) \n            throws IOException {\n        String dateStr = p.getText();\n\n        for (DateTimeFormatter formatter : FORMATTERS) {\n            try {\n                return LocalDate.parse(dateStr, formatter);\n            } catch (DateTimeParseException e) {\n                continue;\n            }\n        }\n\n        throw new JsonParseException(p, \"Invalid date format: \" + dateStr);\n    }\n}<\/pre>\n\n\n\n<p><strong>3. \u30c7\u30d0\u30c3\u30b0\u306e\u30d2\u30f3\u30c8<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class DebugHelper {\n    public static void debugJson(ObjectMapper mapper, Object value) {\n        try {\n            \/\/ \u6574\u5f62\u3055\u308c\u305fJSON\u3092\u51fa\u529b\n            String prettyJson = mapper\n                .writerWithDefaultPrettyPrinter()\n                .writeValueAsString(value);\n            System.out.println(\"Debug JSON output:\");\n            System.out.println(prettyJson);\n\n            \/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u90e8\u72b6\u614b\u3092\u78ba\u8a8d\n            System.out.println(\"\\nObject details:\");\n            System.out.println(mapper.writeValueAsString(\n                mapper.readTree(prettyJson)));\n        } catch (JsonProcessingException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/pre>\n\n\n\n<p>\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Jackson\u95a2\u9023\u306e\u4f9d\u5b58\u95a2\u4fc2\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u6574\u5408\u6027\u78ba\u8a8d<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>null\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u65e5\u4ed8\/\u6642\u523b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u52d5\u4f5c\u78ba\u8a8d<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u89e3\u6c7a\u7b56\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u591a\u304f\u306e\u4e00\u822c\u7684\u306a\u554f\u984c\u3092\u52b9\u7387\u7684\u306b\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-23\">Spring Framework\u3068Jackson\u306e\u9023\u643a<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">Spring Boot\u3067\u306eJackson\u8a2d\u5b9a\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/h3>\n\n\n\n<p>Spring Boot\u306fJackson\u3092\u6a19\u6e96\u306eJSON\u30d7\u30ed\u30bb\u30c3\u30b5\u3068\u3057\u3066\u63a1\u7528\u3057\u3066\u304a\u308a\u3001\u69d8\u3005\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u306e\u8a2d\u5b9a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># application.yml\nspring:\n  jackson:\n    # \u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a\n    date-format: yyyy-MM-dd HH:mm:ss\n    # \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u8a2d\u5b9a\n    time-zone: Asia\/Tokyo\n    # \u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u8a2d\u5b9a\n    serialization:\n      INDENT_OUTPUT: true\n      FAIL_ON_EMPTY_BEANS: false\n    # \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u8a2d\u5b9a\n    deserialization:\n      FAIL_ON_UNKNOWN_PROPERTIES: false\n    # \u30d7\u30ed\u30d1\u30c6\u30a3\u547d\u540d\u6226\u7565\n    property-naming-strategy: SNAKE_CASE<\/pre>\n\n\n\n<p><strong>2. Java\u8a2d\u5b9a\u3067\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Configuration\npublic class JacksonConfig {\n    @Bean\n    public ObjectMapper objectMapper() {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ \u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u8ffd\u52a0\n        mapper.registerModule(new JavaTimeModule());\n\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u8a2d\u5b9a\n        mapper.setDateFormat(new SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\"));\n        mapper.setTimeZone(TimeZone.getTimeZone(\"Asia\/Tokyo\"));\n\n        \/\/ \u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u8a2d\u5b9a\n        mapper.configure(SerializationFeature.INDENT_OUTPUT, true);\n        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);\n\n        return mapper;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">RESTful API\u3067\u306eJackson\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>Spring MVC\u3067RESTful API\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306eJackson\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u57fa\u672c\u7684\u306aREST\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@RestController\n@RequestMapping(\"\/api\/users\")\npublic class UserController {\n    @GetMapping(\"\/{id}\")\n    public ResponseEntity&lt;UserResponse&gt; getUser(@PathVariable Long id) {\n        UserResponse user = userService.findById(id);\n        return ResponseEntity.ok(user);\n    }\n\n    @PostMapping\n    public ResponseEntity&lt;UserResponse&gt; createUser(\n            @RequestBody @Valid UserRequest request) {\n        UserResponse created = userService.create(request);\n        return ResponseEntity\n            .created(URI.create(\"\/api\/users\/\" + created.getId()))\n            .body(created);\n    }\n}\n\n\/\/ \u30ea\u30af\u30a8\u30b9\u30c8\/\u30ec\u30b9\u30dd\u30f3\u30b9DTO\n@JsonInclude(JsonInclude.Include.NON_NULL)\npublic class UserResponse {\n    private Long id;\n\n    @JsonProperty(\"full_name\")\n    private String fullName;\n\n    @JsonFormat(pattern = \"yyyy-MM-dd\")\n    private LocalDate birthDate;\n\n    \/\/ getter\/setter\n}<\/pre>\n\n\n\n<p><strong>2. \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u9069\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@JsonComponent\npublic class CustomSerializers {\n    public static class MoneySerializer extends JsonSerializer&lt;Money&gt; {\n        @Override\n        public void serialize(Money value, JsonGenerator gen,\n                            SerializerProvider provider) throws IOException {\n            gen.writeStartObject();\n            gen.writeNumberField(\"amount\", value.getAmount());\n            gen.writeStringField(\"currency\", value.getCurrency().getCurrencyCode());\n            gen.writeEndObject();\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-26\">\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3068\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/h3>\n\n\n\n<p>Spring Boot\u3067\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3068Jackson\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u5b9f\u88c5\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u8a2d\u5b9a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class UserRequest {\n    @NotBlank(message = \"\u540d\u524d\u306f\u5fc5\u9808\u3067\u3059\")\n    private String name;\n\n    @Email(message = \"\u6709\u52b9\u306a\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\")\n    private String email;\n\n    @Past(message = \"\u751f\u5e74\u6708\u65e5\u306f\u904e\u53bb\u306e\u65e5\u4ed8\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\")\n    @JsonFormat(pattern = \"yyyy-MM-dd\")\n    private LocalDate birthDate;\n}<\/pre>\n\n\n\n<p><strong>2. \u30b0\u30ed\u30fc\u30d0\u30eb\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@RestControllerAdvice\npublic class GlobalExceptionHandler {\n    @ExceptionHandler(MethodArgumentNotValidException.class)\n    public ResponseEntity&lt;ErrorResponse&gt; handleValidationErrors(\n            MethodArgumentNotValidException ex) {\n        List&lt;String&gt; errors = ex.getBindingResult()\n            .getFieldErrors()\n            .stream()\n            .map(FieldError::getDefaultMessage)\n            .collect(Collectors.toList());\n\n        ErrorResponse errorResponse = new ErrorResponse(\n            \"\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\",\n            errors\n        );\n\n        return ResponseEntity\n            .badRequest()\n            .body(errorResponse);\n    }\n\n    @ExceptionHandler(JsonProcessingException.class)\n    public ResponseEntity&lt;ErrorResponse&gt; handleJsonProcessingError(\n            JsonProcessingException ex) {\n        ErrorResponse errorResponse = new ErrorResponse(\n            \"JSON\u30d1\u30fc\u30b9\u30a8\u30e9\u30fc\",\n            Collections.singletonList(ex.getMessage())\n        );\n\n        return ResponseEntity\n            .badRequest()\n            .body(errorResponse);\n    }\n}<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8a2d\u5b9a\u306e\u512a\u5148\u9806\u4f4d<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30d7\u30ed\u30d1\u30c6\u30a3<\/li>\n\n\n\n<li>Java\u30d9\u30fc\u30b9\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u30d9\u30fc\u30b9\u306e\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Configuration\npublic class WebConfig implements WebMvcConfigurer {\n    @Override\n    public void configureMessageConverters(\n            List&lt;HttpMessageConverter&lt;?&gt;&gt; converters) {\n        MappingJackson2HttpMessageConverter converter =\n            new MappingJackson2HttpMessageConverter();\n        converter.setObjectMapper(objectMapper());\n        converters.add(0, converter);\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u8a2d\u5b9a\u3068\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5805\u7262\u306aRESTful API\u3092\u69cb\u7bc9\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-27\">2024\u5e74\u306b\u304a\u3051\u308bJackson\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b910\u9078<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">\u8a2d\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p><strong>1. \u30b7\u30f3\u30b0\u30eb\u30c8\u30f3ObjectMapper\u306e\u4f7f\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Configuration\npublic class JacksonConfiguration {\n    @Bean\n    public ObjectMapper objectMapper() {\n        return new ObjectMapper()\n            .registerModule(new JavaTimeModule())\n            .registerModule(new Jdk8Module())\n            .setSerializationInclusion(JsonInclude.Include.NON_NULL)\n            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)\n            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);\n    }\n}<\/pre>\n\n\n\n<p><strong>2. \u9069\u5207\u306a\u30e2\u30b8\u30e5\u30fc\u30eb\u7ba1\u7406<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ModuleConfiguration {\n    public static ObjectMapper configureModules(ObjectMapper mapper) {\n        \/\/ \u5fc5\u8981\u306a\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u307f\u3092\u767b\u9332\n        mapper.registerModules(\n            new JavaTimeModule(),          \/\/ Java 8 \u65e5\u4ed8\/\u6642\u523b\n            new Jdk8Module(),              \/\/ Optional\u5bfe\u5fdc\n            new ParameterNamesModule(),    \/\/ \u30d1\u30e9\u30e1\u30fc\u30bf\u540d\u306e\u4fdd\u6301\n            new JsonNullableModule()       \/\/ null\u5024\u306e\u9069\u5207\u306a\u51e6\u7406\n        );\n\n        return mapper;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-29\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p><strong>3. \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6700\u9069\u5316<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Component\npublic class MemoryEfficientProcessor {\n    private final ObjectMapper mapper;\n\n    public MemoryEfficientProcessor(ObjectMapper mapper) {\n        this.mapper = mapper;\n    }\n\n    public void processLargeFile(File file) throws IOException {\n        try (JsonParser parser = mapper.getFactory().createParser(file)) {\n            \/\/ \u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u3067\u30e1\u30e2\u30ea\u4f7f\u7528\u3092\u6700\u9069\u5316\n            parser.setCodec(mapper);\n\n            while (parser.nextToken() != null) {\n                if (parser.currentToken() == JsonToken.START_OBJECT) {\n                    processObject(parser);\n                }\n            }\n        }\n    }\n\n    private void processObject(JsonParser parser) throws IOException {\n        \/\/ \u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<p><strong>4. \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6700\u9069\u5316<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Service\npublic class BatchProcessor {\n    private static final int BATCH_SIZE = 1000;\n    private final ObjectWriter writer;\n\n    public BatchProcessor(ObjectMapper mapper) {\n        this.writer = mapper.writer()\n            .withDefaultPrettyPrinter()\n            .withRootValueSeparator(\"\\n\");\n    }\n\n    public void processBatch(List&lt;DataObject&gt; objects, Writer output) \n            throws IOException {\n        int total = objects.size();\n        for (int i = 0; i &lt; total; i += BATCH_SIZE) {\n            List&lt;DataObject&gt; batch = objects.subList(\n                i, Math.min(i + BATCH_SIZE, total));\n            writer.writeValues(output).writeAll(batch);\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-30\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p><strong>5. \u5b89\u5168\u306a\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u8a2d\u5b9a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Configuration\npublic class SecureJacksonConfig {\n    @Bean\n    public ObjectMapper secureObjectMapper() {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8a2d\u5b9a\n        mapper.deactivateDefaultTyping()\n            .configure(MapperFeature.BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES, true)\n            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true);\n\n        \/\/ \u4fe1\u983c\u3067\u304d\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u307f\u3092\u8a31\u53ef\n        PolymorphicTypeValidator ptv = BasicPolymorphicTypeValidator.builder()\n            .allowIfBaseType(YourBaseClass.class)\n            .allowIfSubType(\"com.yourcompany.model\")\n            .build();\n\n        mapper.activateDefaultTyping(ptv, ObjectMapper.DefaultTyping.OBJECT_AND_NON_CONCRETE);\n\n        return mapper;\n    }\n}<\/pre>\n\n\n\n<p><strong>6. \u5165\u529b\u691c\u8a3c\u306e\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ValidationConfig {\n    @Bean\n    public ValidatingObjectMapper validatingObjectMapper() {\n        ObjectMapper mapper = new ObjectMapper();\n\n        \/\/ \u30d0\u30ea\u30c7\u30fc\u30bf\u306e\u8a2d\u5b9a\n        Validator validator = Validation.buildDefaultValidatorFactory()\n            .getValidator();\n\n        return new ValidatingObjectMapper(mapper, validator);\n    }\n}\n\npublic class ValidatingObjectMapper extends ObjectMapper {\n    private final Validator validator;\n\n    public ValidatingObjectMapper(ObjectMapper mapper, Validator validator) {\n        super(mapper);\n        this.validator = validator;\n    }\n\n    @Override\n    public &lt;T&gt; T readValue(String content, Class&lt;T&gt; valueType) \n            throws JsonProcessingException {\n        T value = super.readValue(content, valueType);\n        validate(value);\n        return value;\n    }\n\n    private &lt;T&gt; void validate(T value) {\n        Set&lt;ConstraintViolation&lt;T&gt;&gt; violations = validator.validate(value);\n        if (!violations.isEmpty()) {\n            throw new ValidationException(\n                \"\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc: \" + violations);\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-31\">\u305d\u306e\u4ed6\u306e\u91cd\u8981\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p><strong>7. \u52b9\u7387\u7684\u306a\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@ControllerAdvice\npublic class JacksonErrorHandler {\n    @ExceptionHandler(JsonProcessingException.class)\n    public ResponseEntity&lt;ErrorResponse&gt; handleJsonError(\n            JsonProcessingException ex) {\n        ErrorResponse error = new ErrorResponse(\n            \"JSON\u51e6\u7406\u30a8\u30e9\u30fc\",\n            ex.getMessage(),\n            collectDetailedInfo(ex)\n        );\n\n        return ResponseEntity.badRequest().body(error);\n    }\n\n    private Map&lt;String, String&gt; collectDetailedInfo(\n            JsonProcessingException ex) {\n        Map&lt;String, String&gt; details = new HashMap&lt;&gt;();\n        details.put(\"location\", ex.getLocation().toString());\n        details.put(\"path\", ex.getPath().toString());\n        return details;\n    }\n}<\/pre>\n\n\n\n<p><strong>8. \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u9069\u5207\u306a\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@JsonComponent\npublic class CustomSerializers {\n    public static class MoneySerializer extends JsonSerializer&lt;Money&gt; {\n        private static final NumberFormat FORMAT = \n            NumberFormat.getCurrencyInstance(Locale.JAPAN);\n\n        @Override\n        public void serialize(Money value, JsonGenerator gen,\n                            SerializerProvider provider) throws IOException {\n            gen.writeStartObject();\n            gen.writeNumberField(\"amount\", value.getAmount());\n            gen.writeStringField(\"formatted\", FORMAT.format(value.getAmount()));\n            gen.writeEndObject();\n        }\n    }\n}<\/pre>\n\n\n\n<p><strong>9. \u52b9\u7387\u7684\u306a\u30c6\u30b9\u30c8\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@SpringBootTest\nclass JsonProcessingTest {\n    @Autowired\n    private ObjectMapper mapper;\n\n    @Test\n    void shouldHandleComplexObject() throws Exception {\n        \/\/ \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u6e96\u5099\n        ComplexObject obj = createTestObject();\n\n        \/\/ \u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\n        String json = mapper.writeValueAsString(obj);\n\n        \/\/ JSON\u69cb\u9020\u306e\u691c\u8a3c\n        DocumentContext context = JsonPath.parse(json);\n        assertThat(context.read(\"$.name\", String.class))\n            .isEqualTo(\"\u30c6\u30b9\u30c8\");\n\n        \/\/ \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3068\u6bd4\u8f03\n        ComplexObject parsed = mapper.readValue(json, ComplexObject.class);\n        assertThat(parsed)\n            .usingRecursiveComparison()\n            .isEqualTo(obj);\n    }\n}<\/pre>\n\n\n\n<p><strong>10. \u30d0\u30fc\u30b8\u30e7\u30cb\u30f3\u30b0\u3068\u4e0b\u4f4d\u4e92\u63db\u6027\u306e\u7dad\u6301<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@JsonIgnoreProperties(ignoreUnknown = true)\npublic class VersionedObject {\n    private String id;\n\n    @JsonProperty(\"v2_field\")\n    private String newField;\n\n    @Deprecated\n    @JsonProperty(\"old_field\")\n    private String legacyField;\n\n    \/\/ \u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u7528\u306e\u30e1\u30bd\u30c3\u30c9\n    @JsonProperty(\"old_field\")\n    private void upgradeLegacyField(String value) {\n        if (value != null &amp;&amp; newField == null) {\n            this.newField = convertLegacyFormat(value);\n        }\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u3067\u52b9\u7387\u7684\u306aJSON\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4e21\u7acb\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-32\">Jackson \u306e\u4ee3\u66ff\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u6bd4\u8f03<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-33\">Gson \u3068 Jackson \u306e\u6a5f\u80fd\u6bd4\u8f03<\/h3>\n\n\n\n<p>Gson\uff08Google\u88fd\uff09\u3068Jackson\u306f\u3001Java\u74b0\u5883\u3067\u6700\u3082\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bJSON\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u8981\u306a\u9055\u3044\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306e\u6bd4\u8f03<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ Jackson\u306e\u5834\u5408\nObjectMapper mapper = new ObjectMapper();\nUser user = mapper.readValue(jsonString, User.class);\nString json = mapper.writeValueAsString(user);\n\n\/\/ Gson\u306e\u5834\u5408\nGson gson = new Gson();\nUser user = gson.fromJson(jsonString, User.class);\nString json = gson.toJson(user);<\/pre>\n\n\n\n<p><strong>2. \u4e3b\u306a\u7279\u5fb4\u306e\u6bd4\u8f03<\/strong><\/p>\n\n\n<div id=\"id-d42f437c-3a2b-49db-92a9-9deb02b6b2b5\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6a5f\u80fd<\/th><th>Jackson<\/th><th>Gson<\/th><\/tr><\/thead><tbody><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u9ad8\u901f\uff08\u7279\u306b\u5927\u898f\u6a21\u30c7\u30fc\u30bf\uff09<\/td><td>\u4e2d\u7a0b\u5ea6<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/td><td>\u52b9\u7387\u7684<\/td><td>\u3084\u3084\u975e\u52b9\u7387<\/td><\/tr><tr><td>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027<\/td><td>\u975e\u5e38\u306b\u9ad8\u3044<\/td><td>\u4e2d\u7a0b\u5ea6<\/td><\/tr><tr><td>\u5b66\u7fd2\u66f2\u7dda<\/td><td>\u3084\u3084\u6025<\/td><td>\u7de9\u3084\u304b<\/td><\/tr><tr><td>Spring\u7d71\u5408<\/td><td>\u30c7\u30d5\u30a9\u30eb\u30c8\u30b5\u30dd\u30fc\u30c8<\/td><td>\u8981\u8a2d\u5b9a<\/td><\/tr><tr><td>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/td><td>\u8c4a\u5bcc<\/td><td>\u9069\u5ea6<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-34\">JSON-B \u3068\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p>JSON-B\uff08JSON Binding\uff09\u306fJava EE\/Jakarta EE\u306e\u6a19\u6e96\u4ed5\u69d8\u306e\u4e00\u90e8\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>1. JSON-B\u306e\u7279\u5fb4<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ JSON-B\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\nJsonb jsonb = JsonbBuilder.create();\nUser user = jsonb.fromJson(jsonString, User.class);\nString json = jsonb.toJson(user);\n\n\/\/ \u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u8a2d\u5b9a\nJsonbConfig config = new JsonbConfig()\n    .withNullValues(true)\n    .withFormatting(true);\nJsonb jsonb = JsonbBuilder.create(config);<\/pre>\n\n\n\n<p><strong>2. \u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5225\u306e\u6bd4\u8f03<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ Jackson\u306e\u9ad8\u5ea6\u306a\u578b\u51e6\u7406\n@JsonTypeInfo(use = JsonTypeInfo.Id.NAME)\n@JsonSubTypes({\n    @JsonSubTypes.Type(value = Dog.class, name = \"dog\"),\n    @JsonSubTypes.Type(value = Cat.class, name = \"cat\")\n})\npublic abstract class Animal { }\n\n\/\/ JSON-B\u306e\u578b\u51e6\u7406\n@JsonbTypeInfo(key = \"@type\")\n@JsonbSubtype(type = Dog.class, name = \"dog\")\n@JsonbSubtype(type = Cat.class, name = \"cat\")\npublic abstract class Animal { }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-35\">\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u6700\u9069\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u691c\u8a0e\u57fa\u6e96<\/h3>\n\n\n\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u3001\u4ee5\u4e0b\u306e\u57fa\u6e96\u3067\u9069\u5207\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u9078\u629e\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Jackson\u3092\u9078\u3076\u3079\u304d\u5834\u5408<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spring Framework\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b<\/li>\n\n\n\n<li>\u9ad8\u5ea6\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u304c\u5fc5\u8981<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u306aJSON\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b<\/li>\n\n\n\n<li>\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u8981\u6c42\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u8c4a\u5bcc\u306a\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u304c\u5fc5\u8981<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Gson\u3092\u9078\u3076\u3079\u304d\u5834\u5408<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b7\u30f3\u30d7\u30eb\u306aJSON\u51e6\u7406\u3067\u5341\u5206<\/li>\n\n\n\n<li>\u5b66\u7fd2\u30b3\u30b9\u30c8\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u305f\u3044<\/li>\n\n\n\n<li>\u5c0f\u898f\u6a21\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/li>\n\n\n\n<li>Google\u88fd\u54c1\u3068\u306e\u7d71\u5408\u304c\u591a\u3044<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>JSON-B\u3092\u9078\u3076\u3079\u304d\u5834\u5408<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jakarta EE\u74b0\u5883\u3067\u958b\u767a\u3057\u3066\u3044\u308b<\/li>\n\n\n\n<li>\u6a19\u6e96\u4ed5\u69d8\u3078\u306e\u6e96\u62e0\u304c\u91cd\u8981<\/li>\n\n\n\n<li>\u30d9\u30f3\u30c0\u30fc\u975e\u4f9d\u5b58\u304c\u8981\u4ef6<\/li>\n\n\n\n<li>\u30b7\u30f3\u30d7\u30eb\u306a\u8a2d\u5b9a\u3067\u5341\u5206<\/li>\n<\/ul>\n\n\n\n<p>\u9078\u5b9a\u6642\u306e\u91cd\u8981\u306a\u8003\u616e\u70b9\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u51e6\u7406\u901f\u5ea6\u306e\u6bd4\u8f03\u4f8b\npublic class PerformanceComparison {\n    public void comparePerformance() {\n        \/\/ Jackson\n        ObjectMapper mapper = new ObjectMapper();\n        long jacksonStart = System.nanoTime();\n        mapper.writeValueAsString(largeObject);\n        long jacksonTime = System.nanoTime() - jacksonStart;\n\n        \/\/ Gson\n        Gson gson = new Gson();\n        long gsonStart = System.nanoTime();\n        gson.toJson(largeObject);\n        long gsonTime = System.nanoTime() - gsonStart;\n\n        \/\/ \u7d50\u679c\u6bd4\u8f03\n        System.out.println(\"Jackson\u51e6\u7406\u6642\u9593: \" + jacksonTime + \"ns\");\n        System.out.println(\"Gson\u51e6\u7406\u6642\u9593: \" + gsonTime + \"ns\");\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u5404\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u306f\u72ec\u81ea\u306e\u7279\u5fb4\u3068\u9069\u7528\u9818\u57df\u304c\u3042\u308a\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u9078\u629e\u3092\u884c\u3046\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002Jackson\u306f\u7dcf\u5408\u7684\u306a\u6a5f\u80fd\u3068\u6027\u80fd\u3067\u512a\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5fc5\u305a\u3057\u3082\u3059\u3079\u3066\u306e\u30b1\u30fc\u30b9\u3067\u6700\u9069\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":{"0":"post-1189","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-java","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1189"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1189\/revisions"}],"predecessor-version":[{"id":1190,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1189\/revisions\/1190"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}