{"id":1195,"date":"2025-03-24T08:52:38","date_gmt":"2025-03-23T23:52:38","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1195"},"modified":"2025-03-24T08:52:38","modified_gmt":"2025-03-23T23:52:38","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91gson%e3%81%a7json%e3%82%92%e8%87%aa%e5%9c%a8%e3%81%ab%e6%93%8d%e3%82%8b%ef%bc%817%e3%81%a4%e3%81%ae%e5%ae%9f%e8%a3%85%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1195","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Gson\u3067JSON\u3092\u81ea\u5728\u306b\u64cd\u308b\uff017\u3064\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u6027\u80fd\u6539\u5584\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"i-0\">Gson\u3068\u306f\uff1fJackson\u3068\u306e\u9055\u3044\u304b\u3089\u7406\u89e3\u3059\u308b\u7279\u5fb4\u3068\u5229\u70b9<\/h1>\n\n\n\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\">Gson\u3068\u306f\uff1fJackson\u3068\u306e\u9055\u3044\u304b\u3089\u7406\u89e3\u3059\u308b\u7279\u5fb4\u3068\u5229\u70b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">Google\u88fd\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u3057\u3066\u306e\u4fe1\u983c\u6027\u3068\u5b9f\u7e3e<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u67d4\u8edf\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u80fd\u304c\u5149\u308b\u81ea\u7531\u5ea6<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-5\">Gson\u5c0e\u5165\u304b\u3089\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u307e\u3067<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-6\">Maven\/Gradle\u3067\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u8ffd\u52a0\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-9\">GsonBuilder\u3092\u4f7f\u3063\u305f\u521d\u671f\u8a2d\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u5b9f\u88c5\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">7\u3064\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3067\u30de\u30b9\u30bf\u30fc\u3059\u308bJSON\u51e6\u7406<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">1. \u57fa\u672c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba<\/a>      <\/li>      <li>        <a href=\"#i-22\">2. \u30cd\u30b9\u30c8\u5316\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u52b9\u7387\u51e6\u7406\u30e1\u30bd\u30c3\u30c9<\/a>      <\/li>      <li>        <a href=\"#i-23\">3. \u30ea\u30b9\u30c8\u3084\u30de\u30c3\u30d7\u69cb\u9020\u306e\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li>        <a href=\"#i-25\">4. \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u5b9f\u88c5\u624b\u9806<\/a>      <\/li>      <li>        <a href=\"#i-26\">5. \u65e5\u4ed8\u5f62\u5f0f\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3068\u56fd\u969b\u5316\u5bfe\u5fdc<\/a>      <\/li>      <li>        <a href=\"#i-27\">6. NULL\u306e\u6271\u3044\u3068\u30aa\u30d7\u30b7\u30e7\u30f3\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5b9f\u88c5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-28\">7. \u30d0\u30fc\u30b8\u30e7\u30cb\u30f3\u30b0\u3068\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u4e92\u63db\u5236\u5fa1<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-30\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b\u5b9f\u88c5\u306e\u30b3\u30c4<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-31\">GsonBuilder\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>      <li>        <a href=\"#i-35\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u91cd\u8996\u3057\u305f\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306e\u5b9f\u88c5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-38\">\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3057\u305f\u51e6\u7406\u901f\u5ea6\u306e\u5411\u4e0a<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-42\">\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-43\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-47\">\u4f8b\u5916\u51e6\u7406\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-53\">\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3068\u5b9f\u88c5\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-54\">REST API\u306e\u5fdc\u7b54\u51e6\u7406\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-57\">\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u66f8\u304d\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-60\">\u4ed6\u30b7\u30b9\u30c6\u30e0\u3068\u306e\u9023\u643a\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/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-1\">Google\u88fd\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u3057\u3066\u306e\u4fe1\u983c\u6027\u3068\u5b9f\u7e3e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gson\u306f\u3001Google\u304c\u958b\u767a\u30fb\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3057\u3066\u3044\u308bJava\u306e\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3001Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068JSON\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u76f8\u4e92\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u30022008\u5e74\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3066\u4ee5\u6765\u3001\u591a\u304f\u306e\u4f01\u696d\u3084\u958b\u767a\u8005\u306b\u63a1\u7528\u3055\u308c\u3001\u73fe\u5728\u3082\u6d3b\u767a\u306b\u958b\u767a\u304c\u7d99\u7d9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3b\u306a\u63a1\u7528\u4f01\u696d\u30fb\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Google Android SDK\uff08\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u3057\u3066\u63a1\u7528\uff09<\/li>\n\n\n\n<li>Spring Framework\uff08\u30b5\u30dd\u30fc\u30c8\u5bfe\u8c61\u30e9\u30a4\u30d6\u30e9\u30ea\uff09<\/li>\n\n\n\n<li>Apache Camel\uff08\u30c7\u30fc\u30bf\u5909\u63db\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09<\/li>\n\n\n\n<li>Netflix\uff08\u4e00\u90e8\u306e\u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Gson\u306e\u6700\u5927\u306e\u7279\u5fb4\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u8a2d\u8a08\u601d\u60f3\u3068\u4f7f\u3044\u3084\u3059\u3055\u306b\u3042\u308a\u307e\u3059\u3002\u521d\u671f\u8a2d\u5b9a\u3067\u591a\u304f\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3092\u30ab\u30d0\u30fc\u3057\u306a\u304c\u3089\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u7d30\u304b\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3082\u53ef\u80fd\u306a\u8a2d\u8a08\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-2\">\u67d4\u8edf\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u80fd\u304c\u5149\u308b\u81ea\u7531\u5ea6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gson\u3068Jackson\u3092\u6bd4\u8f03\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u306e\u9055\u3044\u304c\u6d6e\u304b\u3073\u4e0a\u304c\u308a\u307e\u3059\uff1a<\/p>\n\n\n<div id=\"id-aa68e9fa-ac82-49f3-a6a7-d4e7b9edbb45\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6a5f\u80fd\/\u7279\u5fb4<\/th><th>Gson<\/th><th>Jackson<\/th><\/tr><\/thead><tbody><tr><td>\u521d\u671f\u8a2d\u5b9a\u306e\u7c21\u5358\u3055<\/td><td>\u25ce \u6700\u5c0f\u9650\u306e\u8a2d\u5b9a\u3067\u5229\u7528\u53ef\u80fd<\/td><td>\u25cb \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u7b49\u306e\u8a2d\u5b9a\u304c\u5fc5\u8981<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u25cb \u4e00\u822c\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3067\u5341\u5206\u306a\u6027\u80fd<\/td><td>\u25ce \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306b\u5f37\u3044<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/td><td>\u25ce \u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406<\/td><td>\u25cb \u6a5f\u80fd\u306b\u3088\u308b<\/td><\/tr><tr><td>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027<\/td><td>\u25ce TypeAdapter\u7b49\u3067\u67d4\u8edf\u306b\u5bfe\u5fdc\u53ef\u80fd<\/td><td>\u25cb Module\u7cfb\u306e\u4ed5\u7d44\u307f\u3067\u62e1\u5f35\u53ef\u80fd<\/td><\/tr><tr><td>\u5b66\u7fd2\u30b3\u30b9\u30c8<\/td><td>\u25ce \u30b7\u30f3\u30d7\u30eb\u3067\u5b66\u3073\u3084\u3059\u3044<\/td><td>\u25b3 \u6a5f\u80fd\u304c\u8c4a\u5bcc\u3067\u7fd2\u5f97\u306b\u6642\u9593\u304c\u304b\u304b\u308b<\/td><\/tr><tr><td>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/td><td>\u25cb \u57fa\u672c\u7684\u306a\u60c5\u5831\u306f\u5145\u5b9f<\/td><td>\u25ce \u8a73\u7d30\u306a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3042\u308a<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u67d4\u8edf\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u306e\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Gson\u306e\u5f37\u307f\u3067\u3042\u308b\u67d4\u8edf\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u80fd\u3092\u793a\u3059\u5177\u4f53\u4f8b\u3092\u3044\u304f\u3064\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u65e5\u4ed8\u5f62\u5f0f\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/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=\"\">Gson gson = new GsonBuilder()\n    .setDateFormat(\"yyyy-MM-dd HH:mm:ss\")\n    .create();<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>null\u5024\u306e\u6271\u3044\u306e\u5236\u5fa1<\/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=\"\">Gson gson = new GsonBuilder()\n    .serializeNulls()  \/\/ null\u5024\u3082\u542b\u3081\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\n    .create();<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u5b9f\u88c5<\/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 CustomDateSerializer implements JsonSerializer&lt;Date&gt; {\n    @Override\n    public JsonElement serialize(Date date, Type type, JsonSerializationContext context) {\n        return new JsonPrimitive(new SimpleDateFormat(\"MM\/dd\/yyyy\").format(date));\n    }\n}\n\nGson gson = new GsonBuilder()\n    .registerTypeAdapter(Date.class, new CustomDateSerializer())\n    .create();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u4e3b\u306a\u7528\u9014\u3068\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Gson\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u7279\u306b\u529b\u3092\u767a\u63ee\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>RESTful API\u306e\u958b\u767a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HTTP\u30ea\u30af\u30a8\u30b9\u30c8\/\u30ec\u30b9\u30dd\u30f3\u30b9\u306eJSON\u51e6\u7406<\/li>\n\n\n\n<li>Web\u30b5\u30fc\u30d3\u30b9\u306e\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0G<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u8a2d\u5b9a\u306eJSON\u5f62\u5f0f\u3067\u306e\u4fdd\u5b58\/\u8aad\u307f\u8fbc\u307f<\/li>\n\n\n\n<li>\u5916\u90e8\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u51e6\u7406<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u6c38\u7d9a\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eJSON\u5f62\u5f0f\u3067\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30c7\u30fc\u30bf\u306e\u4fdd\u5b58<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u7279\u5fb4\u304b\u3089\u3001Gson\u306f\u7279\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u6700\u9069\u306a\u9078\u629e\u80a2\u3068\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b7\u30f3\u30d7\u30eb\u3067\u76f4\u611f\u7684\u306aAPI\u3092\u91cd\u8996\u3059\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u306e\u9ad8\u3044JSON\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u5b66\u7fd2\u30b3\u30b9\u30c8\u3092\u6291\u3048\u3064\u3064\u3001\u67d4\u8edf\u306a\u5b9f\u88c5\u3092\u884c\u3044\u305f\u3044\u5834\u5408<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6291\u3048\u305f\u3044\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u5408\u306fJackson\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>XML\u306a\u3069\u4ed6\u306e\u30c7\u30fc\u30bf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3082\u6271\u3046\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u3088\u308a\u8a73\u7d30\u306a\u8a2d\u5b9a\u3084\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-5\">Gson\u5c0e\u5165\u304b\u3089\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u307e\u3067<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">Maven\/Gradle\u3067\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u8ffd\u52a0\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">Maven\u3067\u306e\u8ffd\u52a0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">pom.xml\u306b\u4ee5\u4e0b\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u8ffd\u52a0\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=\"\">&lt;dependency&gt;\n    &lt;groupId&gt;com.google.code.gson&lt;\/groupId&gt;\n    &lt;artifactId&gt;gson&lt;\/artifactId&gt;\n    &lt;version&gt;2.10.1&lt;\/version&gt;\n&lt;\/dependency&gt;<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">Gradle\u3067\u306e\u8ffd\u52a0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">build.gradle\u306b\u4ee5\u4e0b\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u8ffd\u52a0\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=\"\">dependencies {\n    implementation 'com.google.code.gson:gson:2.10.1'\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-9\">GsonBuilder\u3092\u4f7f\u3063\u305f\u521d\u671f\u8a2d\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">GsonBuilder\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001Gson\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u52d5\u4f5c\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u8a2d\u5b9a\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">1. \u57fa\u672c\u7684\u306a\u521d\u671f\u5316<\/h3>\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=\"\">\/\/ \u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u521d\u671f\u5316\nGson gson = new Gson();\n\n\/\/ GsonBuilder\u3092\u4f7f\u7528\u3057\u305f\u57fa\u672c\u7684\u306a\u521d\u671f\u5316\nGson gson = new GsonBuilder().create();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">2. \u63a8\u5968\u3055\u308c\u308b\u6a19\u6e96\u8a2d\u5b9a<\/h3>\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=\"\">Gson gson = new GsonBuilder()\n    .setDateFormat(\"yyyy-MM-dd HH:mm:ss\")  \/\/ \u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a\n    .serializeNulls()                       \/\/ null\u5024\u3082\u542b\u3081\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\n    .setPrettyPrinting()                    \/\/ \u6574\u5f62\u3055\u308c\u305fJSON\u3092\u51fa\u529b\n    .disableHtmlEscaping()                  \/\/ HTML\u7279\u6b8a\u6587\u5b57\u306e\u30a8\u30b9\u30b1\u30fc\u30d7\u3092\u7121\u52b9\u5316\n    .create();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">3. \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u56fa\u6709\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u305f\u8a2d\u5b9a<\/h3>\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=\"\">Gson gson = new GsonBuilder()\n    \/\/ \u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\n    .setVersion(1.0)  \n    \/\/ \u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\n    .excludeFieldsWithoutExposeAnnotation()\n    \/\/ \u30c8\u30e9\u30f3\u30b8\u30a7\u30f3\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u542b\u3081\u308b\n    .includeFields()\n    \/\/ \u30ab\u30b9\u30bf\u30e0\u30a2\u30c0\u30d7\u30bf\u30fc\u306e\u767b\u9332\n    .registerTypeAdapter(Date.class, new DateTypeAdapter())\n    .create();<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-13\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">1. \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089JSON\u3078\u306e\u5909\u63db\uff08\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09<\/h3>\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 User {\n    private String name;\n    private int age;\n    private String email;\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001getter\u3001setter\u306f\u7701\u7565\n}\n\n\/\/ \u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306e\u4f8b\nUser user = new User(\"\u5c71\u7530\u592a\u90ce\", 30, \"yamada@example.com\");\nString json = gson.toJson(user);\n\/\/ \u7d50\u679c: {\"name\":\"\u5c71\u7530\u592a\u90ce\",\"age\":30,\"email\":\"yamada@example.com\"}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">2. JSON\u304b\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u5909\u63db\uff08\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09<\/h3>\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=\"\">\/\/ \u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306e\u4f8b\nString json = \"{\\\"name\\\":\\\"\u5c71\u7530\u592a\u90ce\\\",\\\"age\\\":30,\\\"email\\\":\\\"yamada@example.com\\\"}\";\nUser user = gson.fromJson(json, User.class);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">3. \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u578b\u306e\u51e6\u7406<\/h3>\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=\"\">\/\/ List&lt;User&gt;\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\nList&lt;User&gt; users = Arrays.asList(\n    new User(\"\u5c71\u7530\u592a\u90ce\", 30, \"yamada@example.com\"),\n    new User(\"\u9234\u6728\u82b1\u5b50\", 25, \"suzuki@example.com\")\n);\nString json = gson.toJson(users);\n\n\/\/ List&lt;User&gt;\u306e\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\nType userListType = new TypeToken&lt;List&lt;User&gt;&gt;(){}.getType();\nList&lt;User&gt; userList = gson.fromJson(json, userListType);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">4. \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3068JSON\u306e\u5909\u63db<\/h3>\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=\"\">\/\/ \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u5909\u63db\u4f8b\nint number = 42;\nString jsonNumber = gson.toJson(number);  \/\/ \"42\"\n\nboolean bool = true;\nString jsonBool = gson.toJson(bool);      \/\/ \"true\"\n\n\/\/ JSON\u304b\u3089\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3078\u306e\u5909\u63db\nint parsedNumber = gson.fromJson(\"42\", int.class);\nboolean parsedBool = gson.fromJson(\"true\", boolean.class);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30c6\u30a3<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gson\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u306e\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5168\u4f53\u3067\u518d\u5229\u7528\u53ef\u80fd\u3067\u3059<\/li>\n\n\n\n<li>static final\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3092\u63a8\u5968\u3057\u307e\u3059<\/li>\n<\/ul>\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 GsonUtil {\n    private static final Gson GSON = new GsonBuilder()\n        .setDateFormat(\"yyyy-MM-dd HH:mm:ss\")\n        .create();\n\n    \/\/ private\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3092\u9632\u6b62\n    private GsonUtil() {}\n\n    public static Gson getGson() {\n        return GSON;\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>JsonSyntaxException\u3084JsonIOException\u3092try-catch\u3067\u9069\u5207\u306b\u51e6\u7406\u3057\u307e\u3059<\/li>\n<\/ul>\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=\"\">try {\n    User user = gson.fromJson(json, User.class);\n} catch (JsonSyntaxException e) {\n    \/\/ JSON\u5f62\u5f0f\u304c\u4e0d\u6b63\u306a\u5834\u5408\u306e\u51e6\u7406\n    logger.error(\"Invalid JSON format\", e);\n} catch (JsonIOException e) {\n    \/\/ I\/O\u30a8\u30e9\u30fc\u306e\u51e6\u7406\n    logger.error(\"I\/O error during JSON processing\", e);\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u3067\u3001Gson\u3092\u4f7f\u7528\u3057\u305fJSON\u51e6\u7406\u306e\u5927\u90e8\u5206\u306e\u30b1\u30fc\u30b9\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-19\">7\u3064\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3067\u30de\u30b9\u30bf\u30fc\u3059\u308bJSON\u51e6\u7406<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">1. \u57fa\u672c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30ab\u30b9\u30bf\u30e0\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u306e\u6307\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>@SerializedName<\/code>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001Java\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3068JSON\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\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=\"\">public class Product {\n    @SerializedName(\"product_id\")\n    private String productId;\n\n    @SerializedName(\"product_name\")\n    private String name;\n\n    @SerializedName(\"price_amount\")\n    private BigDecimal price;\n\n    \/\/ getter\/setter\u306f\u7701\u7565\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nProduct product = new Product(\"P001\", \"\u9ad8\u7d1a\u8155\u6642\u8a08\", new BigDecimal(\"29800\"));\nString json = gson.toJson(product);\n\/\/ \u7d50\u679c: {\"product_id\":\"P001\",\"product_name\":\"\u9ad8\u7d1a\u8155\u6642\u8a08\",\"price_amount\":29800}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-22\">2. \u30cd\u30b9\u30c8\u5316\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u52b9\u7387\u51e6\u7406\u30e1\u30bd\u30c3\u30c9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u69cb\u9020\u3092\u6301\u3064JSON\u3092\u52b9\u7387\u7684\u306b\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u3092\u793a\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=\"\">public class Order {\n    private String orderId;\n    private Customer customer;\n    private List&lt;OrderItem&gt; items;\n    private Address shippingAddress;\n\n    public static class Customer {\n        private String id;\n        private String name;\n        private String email;\n    }\n\n    public static class OrderItem {\n        private String productId;\n        private int quantity;\n        private BigDecimal price;\n    }\n\n    public static class Address {\n        private String street;\n        private String city;\n        private String postalCode;\n    }\n}\n\n\/\/ \u30cd\u30b9\u30c8\u5316\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51e6\u7406\nOrder order = gson.fromJson(complexJson, Order.class);<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-23\">3. \u30ea\u30b9\u30c8\u3084\u30de\u30c3\u30d7\u69cb\u9020\u306e\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u51e6\u7406<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">TypeToken\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u9069\u5207\u306b\u51e6\u7406\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=\"\">\/\/ \u30ea\u30b9\u30c8\u306e\u51e6\u7406\nType listType = new TypeToken&lt;List&lt;Product&gt;&gt;(){}.getType();\nList&lt;Product&gt; products = gson.fromJson(jsonArray, listType);\n\n\/\/ \u30de\u30c3\u30d7\u306e\u51e6\u7406\nType mapType = new TypeToken&lt;Map&lt;String, Product&gt;&gt;(){}.getType();\nMap&lt;String, Product&gt; productMap = gson.fromJson(jsonObject, mapType);\n\n\/\/ \u8907\u96d1\u306a\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\nType complexType = new TypeToken&lt;Map&lt;String, List&lt;Order&gt;&gt;&gt;(){}.getType();\nMap&lt;String, List&lt;Order&gt;&gt; ordersByCustomer = gson.fromJson(jsonData, complexType);<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-25\">4. \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u5b9f\u88c5\u624b\u9806<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u6b8a\u306a\u30c7\u30fc\u30bf\u578b\u3084\u8907\u96d1\u306a\u5909\u63db\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u793a\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=\"\">public class DateSerializer implements JsonSerializer&lt;Date&gt; {\n    private final SimpleDateFormat format = new SimpleDateFormat(\"yyyy-MM-dd'T'HH:mm:ss'Z'\");\n\n    @Override\n    public JsonElement serialize(Date date, Type typeOfSrc, JsonSerializationContext context) {\n        return new JsonPrimitive(format.format(date));\n    }\n}\n\npublic class DateDeserializer implements JsonDeserializer&lt;Date&gt; {\n    private final SimpleDateFormat format = new SimpleDateFormat(\"yyyy-MM-dd'T'HH:mm:ss'Z'\");\n\n    @Override\n    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)\n            throws JsonParseException {\n        try {\n            return format.parse(json.getAsString());\n        } catch (ParseException e) {\n            throw new JsonParseException(e);\n        }\n    }\n}\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\/\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30b6\u306e\u767b\u9332\nGson gson = new GsonBuilder()\n    .registerTypeAdapter(Date.class, new DateSerializer())\n    .registerTypeAdapter(Date.class, new DateDeserializer())\n    .create();<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-26\">5. \u65e5\u4ed8\u5f62\u5f0f\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3068\u56fd\u969b\u5316\u5bfe\u5fdc<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u69d8\u3005\u306a\u65e5\u4ed8\u5f62\u5f0f\u3068\u5730\u57df\u8a2d\u5b9a\u306b\u5bfe\u5fdc\u3059\u308b\u5b9f\u88c5\u65b9\u6cd5\u3067\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 LocalizedDateAdapter implements JsonSerializer&lt;Date&gt;, JsonDeserializer&lt;Date&gt; {\n    private final Locale locale;\n    private final String pattern;\n\n    public LocalizedDateAdapter(Locale locale, String pattern) {\n        this.locale = locale;\n        this.pattern = pattern;\n    }\n\n    @Override\n    public JsonElement serialize(Date date, Type typeOfSrc, JsonSerializationContext context) {\n        SimpleDateFormat formatter = new SimpleDateFormat(pattern, locale);\n        return new JsonPrimitive(formatter.format(date));\n    }\n\n    @Override\n    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)\n            throws JsonParseException {\n        SimpleDateFormat formatter = new SimpleDateFormat(pattern, locale);\n        try {\n            return formatter.parse(json.getAsString());\n        } catch (ParseException e) {\n            throw new JsonParseException(e);\n        }\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nGson gson = new GsonBuilder()\n    .registerTypeAdapter(Date.class, new LocalizedDateAdapter(Locale.JAPAN, \"yyyy\u5e74MM\u6708dd\u65e5\"))\n    .create();<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-27\">6. NULL\u306e\u6271\u3044\u3068\u30aa\u30d7\u30b7\u30e7\u30f3\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5b9f\u88c5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NULL\u5024\u3068\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9069\u5207\u306b\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u3067\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 OptionalFieldsExample {\n    @SerializedName(\"required_field\")\n    private String requiredField;\n\n    @SerializedName(\"optional_field\")\n    @Expose(serialize = true, deserialize = true)\n    private String optionalField;\n\n    @SerializedName(\"nullable_field\")\n    private String nullableField;\n\n    \/\/ \u30c8\u30e9\u30f3\u30b8\u30a7\u30f3\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u306f JSON \u5909\u63db\u304b\u3089\u9664\u5916\n    transient private String temporaryField;\n}\n\nGson gson = new GsonBuilder()\n    .serializeNulls()  \/\/ NULL\u5024\u3082\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308b\n    .excludeFieldsWithoutExposeAnnotation()  \/\/ @Expose\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u306a\u3044\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\n    .create();<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-28\">7. \u30d0\u30fc\u30b8\u30e7\u30cb\u30f3\u30b0\u3068\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u4e92\u63db\u5236\u5fa1<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">API\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3068\u4e0b\u4f4d\u4e92\u63db\u6027\u3092\u7dad\u6301\u3059\u308b\u5b9f\u88c5\u65b9\u6cd5\u3067\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 VersionedClass {\n    @Since(1.0)\n    private String field1;\n\n    @Since(1.1)\n    private String field2;\n\n    @Until(2.0)\n    private String deprecatedField;\n\n    \/\/ \u30d0\u30fc\u30b8\u30e7\u30f31.0\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\n    Gson gsonV1 = new GsonBuilder().setVersion(1.0).create();\n\n    \/\/ \u30d0\u30fc\u30b8\u30e7\u30f31.1\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\n    Gson gsonV11 = new GsonBuilder().setVersion(1.1).create();\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-29\">\u5b9f\u88c5\u6642\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u578b\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>TypeToken\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u306e\u5b8c\u5168\u306a\u6307\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u5f37\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ab\u30b9\u30bf\u30e0\u4f8b\u5916\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u8ffd\u52a0<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gson\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u518d\u5229\u7528<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u306e\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c6\u30b9\u30c8\u5bb9\u6613\u6027\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e2\u30c3\u30af\u53ef\u80fd\u306a\u8a2d\u8a08<\/li>\n\n\n\n<li>\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u4f5c\u6210<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\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<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-30\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b\u5b9f\u88c5\u306e\u30b3\u30c4<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-31\">GsonBuilder\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">GsonBuilder\u306e\u8a2d\u5b9a\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u3067\u3001JSON\u51e6\u7406\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-32\">1. \u4e0d\u8981\u306a\u6a5f\u80fd\u306e\u7121\u52b9\u5316<\/h3>\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=\"\">Gson gson = new GsonBuilder()\n    .disableHtmlEscaping()           \/\/ HTML\u7279\u6b8a\u6587\u5b57\u306e\u30a8\u30b9\u30b1\u30fc\u30d7\u3092\u7121\u52b9\u5316\n    .disableInnerClassSerialization() \/\/ \u5185\u90e8\u30af\u30e9\u30b9\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3092\u7121\u52b9\u5316\n    .excludeFieldsWithoutExposeAnnotation() \/\/ @Expose\u306e\u306a\u3044\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\n    .create();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-33\">2. \u30d5\u30a3\u30fc\u30eb\u30c9\u30cd\u30fc\u30df\u30f3\u30b0\u30dd\u30ea\u30b7\u30fc\u306e\u6700\u9069\u5316<\/h3>\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=\"\">\/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3092\u4f7f\u7528\uff08\u5909\u63db\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\uff09\nGson gson = new GsonBuilder()\n    .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)\n    .create();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-34\">\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c<\/h3>\n\n\n<div id=\"id-40b0f51c-5f54-4f2b-894b-b1906368bffb\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8a2d\u5b9a<\/th><th>\u51e6\u7406\u6642\u9593\uff08ms\uff09<\/th><th>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\uff08MB\uff09<\/th><\/tr><\/thead><tbody><tr><td>\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a<\/td><td>100<\/td><td>25<\/td><\/tr><tr><td>\u6700\u9069\u5316\u8a2d\u5b9a<\/td><td>85<\/td><td>20<\/td><\/tr><tr><td>\u5168\u6a5f\u80fd\u7121\u52b9\u5316<\/td><td>70<\/td><td>15<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"i-35\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u91cd\u8996\u3057\u305f\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306e\u5b9f\u88c5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u898f\u6a21\u306aJSON\u30c7\u30fc\u30bf\u3092\u6271\u3046\u969b\u306f\u3001\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u3092\u4f7f\u7528\u3057\u3066\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6291\u5236\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-36\">1. JsonReader\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u8aad\u307f\u8fbc\u307f<\/h3>\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 List&lt;User&gt; readUsersStream(Reader reader) {\n    List&lt;User&gt; users = new ArrayList&lt;&gt;();\n    JsonReader jsonReader = new JsonReader(reader);\n\n    try {\n        jsonReader.beginArray();\n        while (jsonReader.hasNext()) {\n            User user = gson.fromJson(jsonReader, User.class);\n            users.add(user);\n        }\n        jsonReader.endArray();\n    } catch (IOException e) {\n        throw new RuntimeException(e);\n    }\n\n    return users;\n}\n\n\/\/ \u4f7f\u7528\u4f8b\ntry (FileReader reader = new FileReader(\"large_users.json\")) {\n    List&lt;User&gt; users = readUsersStream(reader);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-37\">2. JsonWriter\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u66f8\u304d\u8fbc\u307f<\/h3>\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 void writeUsersStream(Writer writer, List&lt;User&gt; users) {\n    JsonWriter jsonWriter = new JsonWriter(writer);\n\n    try {\n        jsonWriter.beginArray();\n        for (User user : users) {\n            gson.toJson(user, User.class, jsonWriter);\n        }\n        jsonWriter.endArray();\n    } catch (IOException e) {\n        throw new RuntimeException(e);\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\ntry (FileWriter writer = new FileWriter(\"output_users.json\")) {\n    writeUsersStream(writer, users);\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-38\">\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3057\u305f\u51e6\u7406\u901f\u5ea6\u306e\u5411\u4e0a<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-39\">1. Gson\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30ad\u30e3\u30c3\u30b7\u30e5<\/h3>\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 GsonCache {\n    private static final Gson INSTANCE = new GsonBuilder()\n        .disableHtmlEscaping()\n        .create();\n\n    private GsonCache() {} \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3092\u9632\u6b62\n\n    public static Gson getInstance() {\n        return INSTANCE;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-40\">2. TypeToken\u306e\u30ad\u30e3\u30c3\u30b7\u30e5<\/h3>\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 TypeTokenCache {\n    private static final Map&lt;Class&lt;?&gt;, Type&gt; TOKEN_CACHE = new ConcurrentHashMap&lt;&gt;();\n\n    public static &lt;T&gt; Type getListType(Class&lt;T&gt; clazz) {\n        return TOKEN_CACHE.computeIfAbsent(clazz, \n            k -&gt; TypeToken.getParameterized(List.class, k).getType());\n    }\n\n    public static &lt;K, V&gt; Type getMapType(Class&lt;K&gt; keyClass, Class&lt;V&gt; valueClass) {\n        return TOKEN_CACHE.computeIfAbsent(keyClass, \n            k -&gt; TypeToken.getParameterized(Map.class, keyClass, valueClass).getType());\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nType userListType = TypeTokenCache.getListType(User.class);\nList&lt;User&gt; users = gson.fromJson(json, userListType);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-41\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u306e\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=\"\">\/\/ \u5927\u304d\u306aJSON\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u969b\u306e\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u8a2d\u5b9a\nBufferedReader reader = new BufferedReader(\n    new FileReader(\"large_file.json\"), \n    32768  \/\/ 32KB\u306e\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\n);<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u30e2\u30cb\u30bf\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=\"\">public class MemoryMonitor {\n    public static void logMemoryUsage() {\n        Runtime runtime = Runtime.getRuntime();\n        long totalMemory = runtime.totalMemory();\n        long freeMemory = runtime.freeMemory();\n        long usedMemory = totalMemory - freeMemory;\n\n        System.out.printf(\"Used Memory: %d MB%n\", usedMemory \/ (1024 * 1024));\n    }\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\u7528\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3<\/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 PerformanceTimer {\n    public static &lt;T&gt; T measureTime(String operation, Supplier&lt;T&gt; action) {\n        long start = System.currentTimeMillis();\n        T result = action.get();\n        long end = System.currentTimeMillis();\n\n        System.out.printf(\"%s took %d ms%n\", operation, (end - start));\n        return result;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nString json = PerformanceTimer.measureTime(\"JSON Serialization\",\n    () -&gt; gson.toJson(largeObject));<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001Gson\u3092\u4f7f\u7528\u3057\u305fJSON\u51e6\u7406\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u6700\u9069\u5316\u306f\u5fc5\u8981\u306a\u5834\u5408\u306b\u306e\u307f\u884c\u3044\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3068\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u5e38\u306b\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-42\">\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-43\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-44\">1. JsonSyntaxException<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JSON\u69cb\u6587\u304c\u4e0d\u6b63\u306a\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u6700\u3082\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3067\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 JsonValidator {\n    private static final Gson gson = new Gson();\n\n    public static boolean isValidJson(String jsonStr) {\n        try {\n            \/\/ JsonElement\u3068\u3057\u3066\u30d1\u30fc\u30b9\u3092\u8a66\u307f\u308b\n            gson.fromJson(jsonStr, JsonElement.class);\n            return true;\n        } catch (JsonSyntaxException e) {\n            return false;\n        }\n    }\n\n    public static String formatJsonError(String jsonStr) {\n        try {\n            gson.fromJson(jsonStr, JsonElement.class);\n            return \"Valid JSON\";\n        } catch (JsonSyntaxException e) {\n            return \"Invalid JSON: \" + e.getMessage();\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-45\">2. JsonParseException<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u5b9a\u306e\u578b\u3078\u306e\u5909\u63db\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\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 SafeJsonParser&lt;T&gt; {\n    private final Gson gson;\n    private final Class&lt;T&gt; type;\n\n    public SafeJsonParser(Class&lt;T&gt; type) {\n        this.gson = new Gson();\n        this.type = type;\n    }\n\n    public Optional&lt;T&gt; parse(String json) {\n        try {\n            T result = gson.fromJson(json, type);\n            return Optional.ofNullable(result);\n        } catch (JsonParseException e) {\n            logger.error(\"Failed to parse JSON: {}\", json, e);\n            return Optional.empty();\n        }\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nSafeJsonParser&lt;User&gt; parser = new SafeJsonParser&lt;&gt;(User.class);\nOptional&lt;User&gt; user = parser.parse(jsonString);\nuser.ifPresent(u -&gt; System.out.println(\"User parsed: \" + u.getName()));<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-46\">3. \u30c7\u30fc\u30bf\u578b\u306e\u4e0d\u4e00\u81f4\u30a8\u30e9\u30fc<\/h3>\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 TypeSafeParser {\n    private static final Gson gson = new Gson();\n\n    public static &lt;T&gt; T parseWithTypeCheck(JsonElement element, Class&lt;T&gt; expectedType) {\n        try {\n            if (expectedType == String.class &amp;&amp; !element.isJsonPrimitive()) {\n                throw new JsonParseException(\"Expected String but got \" + element.getClass().getSimpleName());\n            }\n            return gson.fromJson(element, expectedType);\n        } catch (NumberFormatException e) {\n            throw new JsonParseException(\"Expected number but got: \" + element);\n        }\n    }\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-47\">\u4f8b\u5916\u51e6\u7406\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-48\">1. \u30ab\u30b9\u30bf\u30e0\u4f8b\u5916\u306e\u5b9f\u88c5<\/h3>\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 GsonException extends RuntimeException {\n    private final String json;\n    private final String targetType;\n\n    public GsonException(String message, String json, String targetType, Throwable cause) {\n        super(message, cause);\n        this.json = json;\n        this.targetType = targetType;\n    }\n\n    public String getJson() {\n        return json;\n    }\n\n    public String getTargetType() {\n        return targetType;\n    }\n}\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u4f8b\u5916\u3092\u4f7f\u7528\u3057\u305f\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\npublic class GsonWrapper {\n    private final Gson gson;\n\n    public GsonWrapper(Gson gson) {\n        this.gson = gson;\n    }\n\n    public &lt;T&gt; T fromJson(String json, Class&lt;T&gt; classOfT) throws GsonException {\n        try {\n            return gson.fromJson(json, classOfT);\n        } catch (JsonSyntaxException | JsonParseException e) {\n            throw new GsonException(\n                \"Failed to parse JSON\",\n                json,\n                classOfT.getSimpleName(),\n                e\n            );\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-49\">2. \u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u5f37\u5316<\/h3>\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 JsonLogger {\n    private static final Logger logger = LoggerFactory.getLogger(JsonLogger.class);\n\n    public static void logJsonError(String operation, String json, Exception e) {\n        logger.error(\"JSON {} failed. Input: {}\", operation, maskSensitiveData(json), e);\n    }\n\n    private static String maskSensitiveData(String json) {\n        \/\/ \u30bb\u30f3\u30b7\u30c6\u30a3\u30d6\u30c7\u30fc\u30bf\u306e\u30de\u30b9\u30af\u51e6\u7406\n        return json.replaceAll(\"\\\"password\\\":\\\"[^\\\"]*\\\"\", \"\\\"password\\\":\\\"*****\\\"\")\n                  .replaceAll(\"\\\"creditCard\\\":\\\"[^\\\"]*\\\"\", \"\\\"creditCard\\\":\\\"*****\\\"\");\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-50\">3. \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u6a5f\u80fd\u306e\u5b9f\u88c5<\/h3>\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 JsonValidator {\n    private final Gson gson;\n    private final JsonSchema schema;\n\n    public JsonValidator(String schemaJson) {\n        this.gson = new Gson();\n        this.schema = JsonSchema.parse(schemaJson);\n    }\n\n    public ValidationResult validate(String json) {\n        try {\n            JsonElement element = gson.fromJson(json, JsonElement.class);\n            List&lt;ValidationError&gt; errors = new ArrayList&lt;&gt;();\n\n            \/\/ \u30b9\u30ad\u30fc\u30de\u306b\u57fa\u3065\u304f\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\n            validateElement(element, schema, \"\", errors);\n\n            return new ValidationResult(errors.isEmpty(), errors);\n        } catch (JsonSyntaxException e) {\n            return new ValidationResult(false, \n                Collections.singletonList(new ValidationError(\"Invalid JSON syntax\")));\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-51\">\u30c7\u30d0\u30c3\u30b0\u306e\u305f\u3081\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3<\/h3>\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 GsonDebugger {\n    private static final Gson PRETTY_GSON = new GsonBuilder().setPrettyPrinting().create();\n\n    public static String prettyPrint(String json) {\n        try {\n            JsonElement je = JsonParser.parseString(json);\n            return PRETTY_GSON.toJson(je);\n        } catch (JsonSyntaxException e) {\n            return \"Invalid JSON: \" + e.getMessage();\n        }\n    }\n\n    public static void debugJson(String json, Class&lt;?&gt; targetType) {\n        System.out.println(\"=== JSON Debug Info ===\");\n        System.out.println(\"Input JSON:\");\n        System.out.println(prettyPrint(json));\n        System.out.println(\"\\nTarget Type: \" + targetType.getSimpleName());\n        try {\n            Object parsed = new Gson().fromJson(json, targetType);\n            System.out.println(\"Successfully parsed to: \" + parsed);\n        } catch (Exception e) {\n            System.out.println(\"Parsing failed: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-52\">\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u968e\u5c64\u7684\u306a\u4f8b\u5916\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5177\u4f53\u7684\u306a\u4f8b\u5916\u304b\u3089\u9806\u306b\u6355\u6349<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u4f8b\u5916\u306e\u5909\u63db\u3068\u60c5\u5831\u306e\u4fdd\u6301<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u6a19\u6e96\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u660e\u78ba\u3067\u4e00\u8cab\u6027\u306e\u3042\u308b\u30e1\u30c3\u30bb\u30fc\u30b8<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306e\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ea\u30ab\u30d0\u30ea\u30fc\u6226\u7565\u306e\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5024\u306e\u63d0\u4f9b<\/li>\n\n\n\n<li>\u518d\u8a66\u884c\u30e1\u30ab\u30cb\u30ba\u30e0\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u76e3\u8996\u3068\u30ed\u30ae\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u69cb\u9020\u5316\u30ed\u30b0\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u50be\u5411\u306e\u5206\u6790<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5805\u7262\u306aJSON\u51e6\u7406\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-53\">\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3068\u5b9f\u88c5\u4f8b<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-54\">REST API\u306e\u5fdc\u7b54\u51e6\u7406\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-55\">1. Spring Boot\u3068\u306e\u7d71\u5408\u4f8b<\/h3>\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\")\npublic class UserController {\n    private final Gson gson;\n\n    public UserController() {\n        this.gson = new GsonBuilder()\n            .setDateFormat(\"yyyy-MM-dd'T'HH:mm:ss.SSSZ\")\n            .serializeNulls()\n            .create();\n    }\n\n    @PostMapping(\"\/users\")\n    public ResponseEntity&lt;String&gt; createUser(@RequestBody String jsonBody) {\n        try {\n            User user = gson.fromJson(jsonBody, User.class);\n            \/\/ \u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306e\u51e6\u7406\n            return ResponseEntity.ok(gson.toJson(user));\n        } catch (JsonParseException e) {\n            return ResponseEntity.badRequest()\n                .body(gson.toJson(new ErrorResponse(\"Invalid JSON format\")));\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-56\">2. HTTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u306e\u4f7f\u7528\u4f8b<\/h3>\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 ApiClient {\n    private final OkHttpClient client;\n    private final Gson gson;\n    private final String baseUrl;\n\n    public ApiClient(String baseUrl) {\n        this.client = new OkHttpClient.Builder()\n            .connectTimeout(30, TimeUnit.SECONDS)\n            .readTimeout(30, TimeUnit.SECONDS)\n            .build();\n        this.gson = new Gson();\n        this.baseUrl = baseUrl;\n    }\n\n    public &lt;T&gt; T get(String path, Class&lt;T&gt; responseType) throws IOException {\n        Request request = new Request.Builder()\n            .url(baseUrl + path)\n            .build();\n\n        try (Response response = client.newCall(request).execute()) {\n            if (!response.isSuccessful()) {\n                throw new IOException(\"Unexpected response \" + response);\n            }\n\n            String responseBody = response.body().string();\n            return gson.fromJson(responseBody, responseType);\n        }\n    }\n\n    public &lt;T&gt; T post(String path, Object requestBody, Class&lt;T&gt; responseType) throws IOException {\n        String json = gson.toJson(requestBody);\n        RequestBody body = RequestBody.create(json, MediaType.parse(\"application\/json\"));\n\n        Request request = new Request.Builder()\n            .url(baseUrl + path)\n            .post(body)\n            .build();\n\n        try (Response response = client.newCall(request).execute()) {\n            if (!response.isSuccessful()) {\n                throw new IOException(\"Unexpected response \" + response);\n            }\n\n            String responseBody = response.body().string();\n            return gson.fromJson(responseBody, responseType);\n        }\n    }\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-57\">\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u66f8\u304d\u306e\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-58\">1. \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u8a2d\u5b9a\u306e\u7ba1\u7406<\/h3>\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 ConfigManager {\n    private static final String CONFIG_FILE = \"config.json\";\n    private final Gson gson;\n    private AppConfig config;\n\n    public static class AppConfig {\n        private String databaseUrl;\n        private int maxConnections;\n        private Map&lt;String, String&gt; features;\n        private List&lt;String&gt; allowedOrigins;\n\n        \/\/ getter\/setter\u306f\u7701\u7565\n    }\n\n    public ConfigManager() {\n        this.gson = new GsonBuilder()\n            .setPrettyPrinting()\n            .create();\n        loadConfig();\n    }\n\n    private void loadConfig() {\n        try (Reader reader = new FileReader(CONFIG_FILE)) {\n            config = gson.fromJson(reader, AppConfig.class);\n        } catch (IOException e) {\n            config = new AppConfig(); \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\n            saveConfig(); \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\u3092\u4fdd\u5b58\n        }\n    }\n\n    public void saveConfig() {\n        try (Writer writer = new FileWriter(CONFIG_FILE)) {\n            gson.toJson(config, writer);\n        } catch (IOException e) {\n            throw new RuntimeException(\"Failed to save config\", e);\n        }\n    }\n\n    public AppConfig getConfig() {\n        return config;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-59\">2. \u74b0\u5883\u5225\u8a2d\u5b9a\u306e\u7ba1\u7406<\/h3>\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 EnvironmentConfig {\n    private static final Map&lt;String, String&gt; CONFIG_FILES = Map.of(\n        \"development\", \"config.dev.json\",\n        \"staging\", \"config.staging.json\",\n        \"production\", \"config.prod.json\"\n    );\n\n    private final Gson gson;\n    private final String environment;\n\n    public EnvironmentConfig(String environment) {\n        this.gson = new GsonBuilder()\n            .setPrettyPrinting()\n            .create();\n        this.environment = environment;\n    }\n\n    public &lt;T&gt; T loadConfig(Class&lt;T&gt; configClass) {\n        String configFile = CONFIG_FILES.get(environment);\n        if (configFile == null) {\n            throw new IllegalArgumentException(\"Unknown environment: \" + environment);\n        }\n\n        try (InputStream is = getClass().getClassLoader().getResourceAsStream(configFile)) {\n            if (is == null) {\n                throw new FileNotFoundException(\"Config file not found: \" + configFile);\n            }\n            Reader reader = new InputStreamReader(is);\n            return gson.fromJson(reader, configClass);\n        } catch (IOException e) {\n            throw new RuntimeException(\"Failed to load config\", e);\n        }\n    }\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-60\">\u4ed6\u30b7\u30b9\u30c6\u30e0\u3068\u306e\u9023\u643a\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-61\">1. WebSocket\u3067\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u51e6\u7406<\/h3>\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=\"\">@WebSocket\npublic class WebSocketHandler {\n    private final Gson gson;\n\n    public WebSocketHandler() {\n        this.gson = new GsonBuilder()\n            .setDateFormat(\"yyyy-MM-dd'T'HH:mm:ss.SSSZ\")\n            .create();\n    }\n\n    @OnMessage\n    public void onMessage(Session session, String message) {\n        try {\n            JsonObject jsonMessage = JsonParser.parseString(message).getAsJsonObject();\n            String type = jsonMessage.get(\"type\").getAsString();\n\n            switch (type) {\n                case \"chat\":\n                    ChatMessage chatMessage = gson.fromJson(message, ChatMessage.class);\n                    handleChatMessage(session, chatMessage);\n                    break;\n                case \"notification\":\n                    Notification notification = gson.fromJson(message, Notification.class);\n                    handleNotification(session, notification);\n                    break;\n                default:\n                    session.getBasicRemote().sendText(\n                        gson.toJson(new ErrorMessage(\"Unknown message type: \" + type))\n                    );\n            }\n        } catch (Exception e) {\n            try {\n                session.getBasicRemote().sendText(\n                    gson.toJson(new ErrorMessage(\"Failed to process message: \" + e.getMessage()))\n                );\n            } catch (IOException ex) {\n                \/\/ \u30ed\u30b0\u51fa\u529b\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-62\">2. \u30ad\u30e3\u30c3\u30b7\u30e5\u30b7\u30b9\u30c6\u30e0\u3068\u306e\u9023\u643a<\/h3>\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 CacheManager&lt;T&gt; {\n    private final Gson gson;\n    private final Redis redis;\n    private final Class&lt;T&gt; type;\n\n    public CacheManager(Redis redis, Class&lt;T&gt; type) {\n        this.gson = new Gson();\n        this.redis = redis;\n        this.type = type;\n    }\n\n    public void put(String key, T value, Duration ttl) {\n        String json = gson.toJson(value);\n        redis.set(key, json, ttl);\n    }\n\n    public Optional&lt;T&gt; get(String key) {\n        String json = redis.get(key);\n        if (json == null) {\n            return Optional.empty();\n        }\n\n        try {\n            T value = gson.fromJson(json, type);\n            return Optional.ofNullable(value);\n        } catch (JsonSyntaxException e) {\n            redis.delete(key); \/\/ \u4e0d\u6b63\u306aJSON\u3092\u524a\u9664\n            return Optional.empty();\n        }\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3050\u306b\u6d3b\u7528\u3067\u304d\u308b\u5f62\u3067\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gson\u3068\u306f\uff1fJackson\u3068\u306e\u9055\u3044\u304b\u3089\u7406\u89e3\u3059\u308b\u7279\u5fb4\u3068\u5229\u70b9 Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_ht &#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":["post-1195","post","type-post","status-publish","format-standard","category-java","nothumb"],"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1195","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=1195"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1195\/revisions"}],"predecessor-version":[{"id":1196,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1195\/revisions\/1196"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}