{"id":94886,"date":"2024-03-21T18:31:40","date_gmt":"2024-03-21T09:31:40","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e5%8b%95%e7%9a%84%e3%81%ab%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95\/"},"modified":"2024-03-28T03:27:59","modified_gmt":"2024-03-27T18:27:59","slug":"java%e3%81%a7%e5%8b%95%e7%9a%84%e3%81%ab%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e5%8b%95%e7%9a%84%e3%81%ab%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95\/","title":{"rendered":"Java\u3067\u52d5\u7684\u306b\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044"},"content":{"rendered":"<p>Java \u3067\u306f\u3001\u30af\u30e9\u30b9\u3092\u52d5\u7684\u306b\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u8907\u6570\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30af\u30e9\u30b9<\/li>\n<li>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/li>\n<li>Class.forName()<\/li>\n<li>newInstance()<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>Class&lt;?&gt; clazz = Class.forName(<span class=\"hljs-string\">\"com.example.MyClass\"<\/span>);\r\n<span class=\"hljs-type\">Object<\/span> <span class=\"hljs-variable\">obj<\/span> <span class=\"hljs-operator\">=<\/span> clazz.newInstance();\r\n<\/code><\/pre>\n<ol>\n<li>\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b: ASM \u3084 Byte Buddy \u306a\u3069\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u64cd\u4f5c\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u3001\u76f4\u63a5\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u3092\u64cd\u4f5c\u3057\u3001\u65b0\u3057\u3044\u30af\u30e9\u30b9\u3092\u52d5\u7684\u306b\u751f\u6210\u3067\u304d\u307e\u3059\u3002\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u6ce8\u91c8\u306a\u3069\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u52d5\u7684\u306b\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">ClassWriter<\/span> <span class=\"hljs-variable\">cw<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ClassWriter<\/span>(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);\r\ncw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC, <span class=\"hljs-string\">\"com\/example\/MyClass\"<\/span>, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-string\">\"java\/lang\/Object\"<\/span>, <span class=\"hljs-literal\">null<\/span>);\r\n\r\ncw.visitField(Opcodes.ACC_PRIVATE, <span class=\"hljs-string\">\"name\"<\/span>, <span class=\"hljs-string\">\"Ljava\/lang\/String;\"<\/span>, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-literal\">null<\/span>).visitEnd();\r\n\r\n<span class=\"hljs-type\">MethodVisitor<\/span> <span class=\"hljs-variable\">mv<\/span> <span class=\"hljs-operator\">=<\/span> cw.visitMethod(Opcodes.ACC_PUBLIC, <span class=\"hljs-string\">\"getName\"<\/span>, <span class=\"hljs-string\">\"()Ljava\/lang\/String;\"<\/span>, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-literal\">null<\/span>);\r\nmv.visitCode();\r\nmv.visitVarInsn(Opcodes.ALOAD, <span class=\"hljs-number\">0<\/span>);\r\nmv.visitFieldInsn(Opcodes.GETFIELD, <span class=\"hljs-string\">\"com\/example\/MyClass\"<\/span>, <span class=\"hljs-string\">\"name\"<\/span>, <span class=\"hljs-string\">\"Ljava\/lang\/String;\"<\/span>);\r\nmv.visitInsn(Opcodes.ARETURN);\r\nmv.visitMaxs(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>);\r\nmv.visitEnd();\r\n\r\ncw.visitEnd();\r\n<span class=\"hljs-type\">byte<\/span>[] bytecode = cw.toByteArray();\r\n\r\n<span class=\"hljs-type\">ClassLoader<\/span> <span class=\"hljs-variable\">classLoader<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyClassLoader<\/span>();\r\nClass&lt;?&gt; clazz = classLoader.defineClass(<span class=\"hljs-string\">\"com.example.MyClass\"<\/span>, bytecode);\r\n<span class=\"hljs-type\">Object<\/span> <span class=\"hljs-variable\">obj<\/span> <span class=\"hljs-operator\">=<\/span> clazz.newInstance();\r\n<\/code><\/pre>\n<ol>\n<li>Invocation\u30cf\u30f3\u30c9\u30e9<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyInvocationHandler<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">InvocationHandler<\/span> {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> Object <span class=\"hljs-title function_\">invoke<\/span><span class=\"hljs-params\">(Object proxy, Method method, Object[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> Throwable {\r\n        <span class=\"hljs-comment\">\/\/ \u5b9e\u73b0\u81ea\u5b9a\u4e49\u903b\u8f91<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n    }\r\n}\r\n\r\n<span class=\"hljs-type\">MyInterface<\/span> <span class=\"hljs-variable\">proxy<\/span> <span class=\"hljs-operator\">=<\/span> (MyInterface) Proxy.newProxyInstance(\r\n        MyInterface.class.getClassLoader(),\r\n        <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Class<\/span>[] { MyInterface.class },\r\n        <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyInvocationHandler<\/span>());\r\n<\/code><\/pre>\n<p>\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u3089\u308c\u3001\u305d\u308c\u305e\u308c\u306b\u9069\u3057\u305f\u5834\u9762\u3084\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u3067\u306f\u3001\u30af\u30e9\u30b9\u3092\u52d5\u7684\u306b\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u8907\u6570\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002 \u30af\u30e9\u30b9 \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf Class.forName() newInstance() Class&lt;?&gt; clazz = Class.forNa [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-94886","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\u3067\u52d5\u7684\u306b\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044 - 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\u3067\u52d5\u7684\u306b\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\/\" \/>\n<meta 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