{"id":116629,"date":"2024-03-23T07:21:24","date_gmt":"2024-03-22T22:21:24","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%83%aa%e3%83%95%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%a7%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%b1%9e%e6%80%a7%e3%81%ab%e3%82%a2%e3%83%8e%e3%83%86%e3%83%bc%e3%82%b7\/"},"modified":"2024-04-05T10:58:45","modified_gmt":"2024-04-05T01:58:45","slug":"java-%e3%83%aa%e3%83%95%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%a7%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%b1%9e%e6%80%a7%e3%81%ab%e3%82%a2%e3%83%8e%e3%83%86%e3%83%bc%e3%82%b7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%83%aa%e3%83%95%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%a7%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%b1%9e%e6%80%a7%e3%81%ab%e3%82%a2%e3%83%8e%e3%83%86%e3%83%bc%e3%82%b7\/","title":{"rendered":"Java \u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3069\u306e\u3088\u3046\u306b\u5c5e\u6027\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3057\u307e\u3059\u304b"},"content":{"rendered":"<p>Java \u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u51e6\u7406\u3055\u308c\u308b\u305f\u3081\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u52d5\u7684\u306b\u30af\u30e9\u30b9\u306e\u60c5\u5831\u3092\u898b\u3066\u64cd\u4f5c\u3067\u304d\u308b\u5b9f\u884c\u6642\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>Java\u3067\u306f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30af\u30e9\u30b9\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306a\u3069\u306e\u8981\u7d20\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u5b9f\u884c\u6642\u306b\u5c5e\u6027\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u52d5\u7684\u306b\u8ffd\u52a0\u3057\u305f\u3044\u5834\u5408\u306f\u3001ASM\u307e\u305f\u306fByte Buddy\u306a\u3069\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3001\u30af\u30e9\u30b9\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3059\u308b\u305f\u3081\u306eAPI\u3092\u63d0\u4f9b\u3057\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u6642\u306b\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u52d5\u7684\u306b\u5909\u66f4\u3057\u3066\u6ce8\u91c8\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u6642\u306b\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30b9\u3092\u30ed\u30fc\u30c9\u3057\u3001\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5909\u66f4\u3057\u3001\u5909\u66f4\u3055\u308c\u305f\u30af\u30e9\u30b9\u306b\u6ce8\u91c8\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u3001Byte Buddy\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> net.bytebuddy.ByteBuddy;\r\n<span class=\"hljs-keyword\">import<\/span> net.bytebuddy.description.annotation.AnnotationDescription;\r\n<span class=\"hljs-keyword\">import<\/span> net.bytebuddy.description.field.FieldDescription;\r\n<span class=\"hljs-keyword\">import<\/span> net.bytebuddy.description.field.FieldList;\r\n<span class=\"hljs-keyword\">import<\/span> net.bytebuddy.dynamic.DynamicType;\r\n<span class=\"hljs-keyword\">import<\/span> net.bytebuddy.implementation.FieldAccessor;\r\n<span class=\"hljs-keyword\">import<\/span> net.bytebuddy.matcher.ElementMatchers;\r\n\r\n<span class=\"hljs-keyword\">import<\/span> java.lang.annotation.ElementType;\r\n<span class=\"hljs-keyword\">import<\/span> java.lang.annotation.Retention;\r\n<span class=\"hljs-keyword\">import<\/span> java.lang.annotation.RetentionPolicy;\r\n<span class=\"hljs-keyword\">import<\/span> java.lang.reflect.Field;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Main<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> NoSuchFieldException {\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u52a8\u6001\u7c7b\u578b\u751f\u6210\u5668<\/span>\r\n        DynamicType.Builder&lt;Sample&gt; builder = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ByteBuddy<\/span>()\r\n                .subclass(Sample.class);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u6ce8\u89e3\u63cf\u8ff0<\/span>\r\n        <span class=\"hljs-type\">AnnotationDescription<\/span> <span class=\"hljs-variable\">annotation<\/span> <span class=\"hljs-operator\">=<\/span> AnnotationDescription.Builder.ofType(MyAnnotation.class)\r\n                .define(<span class=\"hljs-string\">\"value\"<\/span>, <span class=\"hljs-string\">\"Hello, World!\"<\/span>)\r\n                .build();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5c5e\u6027\u5217\u8868<\/span>\r\n        FieldList&lt;FieldDescription.InDefinedShape&gt; fields = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FieldDescription<\/span>.ForLoadedFields.Builder&lt;Sample&gt;()\r\n                .addField(ElementMatchers.&lt;Field&gt;isDeclaredBy(Sample.class))\r\n                .build();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u7ed9\u5c5e\u6027\u6dfb\u52a0\u6ce8\u89e3<\/span>\r\n        <span class=\"hljs-keyword\">for<\/span> (FieldDescription.InDefinedShape field : fields) {\r\n            builder = builder.defineField(field.getName(), field.getType(), field.getModifiers())\r\n                    .annotateField(annotation)\r\n                    .implement(FieldAccessor.ofField(field));\r\n        }\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u52a8\u6001\u7c7b\u578b<\/span>\r\n        Class&lt;? <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Sample<\/span>&gt; dynamicType = builder.make()\r\n                .load(Sample.class.getClassLoader())\r\n                .getLoaded();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5c5e\u6027\u4e0a\u7684\u6ce8\u89e3<\/span>\r\n        <span class=\"hljs-type\">Field<\/span> <span class=\"hljs-variable\">field<\/span> <span class=\"hljs-operator\">=<\/span> dynamicType.getDeclaredField(<span class=\"hljs-string\">\"message\"<\/span>);\r\n        <span class=\"hljs-type\">MyAnnotation<\/span> <span class=\"hljs-variable\">myAnnotation<\/span> <span class=\"hljs-operator\">=<\/span> field.getAnnotation(MyAnnotation.class);\r\n        System.out.println(myAnnotation.value()); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1aHello, World!<\/span>\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Retention(RetentionPolicy.RUNTIME)<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-meta\">@interface<\/span> MyAnnotation {\r\n        String <span class=\"hljs-title function_\">value<\/span><span class=\"hljs-params\">()<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Sample<\/span> {\r\n        <span class=\"hljs-meta\">@MyAnnotation(\"Hello, World!\")<\/span>\r\n        <span class=\"hljs-keyword\">private<\/span> String message;\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001Byte Buddy\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u52d5\u7684\u578b\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3092\u4f5c\u6210\u3057\u3001\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u6b21\u306b\u3001FieldList\u3092\u4f7f\u7528\u3057\u3066\u578b\u5185\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30ea\u30b9\u30c8\u3092\u53d6\u5f97\u3057\u3001\u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001make()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u52d5\u7684\u578b\u3092\u4f5c\u6210\u3057\u3001load()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u578b\u3092\u8aad\u307f\u8fbc\u307f\u3001\u6700\u7d42\u7684\u306b\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u30d5\u30a3\u30fc\u30eb\u30c9\u4e0a\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u6d3b\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u306e\u7406\u89e3\u304c\u5fc5\u8981\u3067\u3042\u308a\u3001\u30b3\u30fc\u30c9\u53ef\u8aad\u6027\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u5b9f\u969b\u306e\u958b\u767a\u306b\u304a\u3044\u3066\u306f\u3001\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u308b\u52d5\u7684\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u8ffd\u52a0\u306e\u6d3b\u7528\u306f\u3001\u8981\u4ef6\u3092\u8e0f\u307e\u3048\u305f\u614e\u91cd\u306a\u691c\u8a0e\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u51e6\u7406\u3055\u308c\u308b\u305f\u3081\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u52d5\u7684\u306b\u30af\u30e9\u30b9\u306e\u60c5\u5831\u3092\u898b\u3066\u64cd\u4f5c\u3067\u304d\u308b\u5b9f\u884c\u6642\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-116629","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3069\u306e\u3088\u3046\u306b\u5c5e\u6027\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3057\u307e\u3059\u304b - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java-\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3069\u306e\u3088\u3046\u306b\u5c5e\u6027\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java 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