{"id":31448,"date":"2023-10-06T15:30:14","date_gmt":"2023-01-15T19:28:32","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%8f%8d%e5%b0%84%e7%9a%84%e5%85%a5%e9%97%a8\/"},"modified":"2024-05-04T03:06:28","modified_gmt":"2024-05-03T19:06:28","slug":"java%e5%8f%8d%e5%b0%84%e7%9a%84%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%8f%8d%e5%b0%84%e7%9a%84%e5%85%a5%e9%97%a8\/","title":{"rendered":"Java\u53cd\u5c04\u7684\u5165\u95e8"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

“Reflection” refers to the act of contemplating or introspecting.<\/h2>\n

\u53cd\u601d\u662fJava\u7684\u6807\u51c6API\uff0c\u7528\u4e8e\u5904\u7406\u7c7b\u3001\u6784\u9020\u51fd\u6570\u3001\u5b57\u6bb5\u3001\u65b9\u6cd5\u7b49\u3002<\/p>\n

\u5177\u4f53\u6765\u8bf4\uff0c\u6709\u4ee5\u4e0b\u51e0\u4e2a\u7c7b\u522b\u3002<\/p>\n

\n
\u30d1\u30c3\u30b1\u30fc\u30b8\u30af\u30e9\u30b9\u540d\u8868\u3059\u3082\u306ejava.lang<\/code>Class<\/code>\u30af\u30e9\u30b9java.lang.reflect<\/code>Constructor<\/code>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bfjava.lang.reflect<\/code>Field<\/code>\u30d5\u30a3\u30fc\u30eb\u30c9java.lang.reflect<\/code>Method<\/code>\u30e1\u30bd\u30c3\u30c9<\/div>\n<\/div>\n

\u4e86\u89e3\u201c\u53cd\u601d\u201d\u7684\u91cd\u8981\u6027<\/h2>\n

\u5728Spring\u7b49\u6846\u67b6\u4e2d\uff0c\u901a\u8fc7\u4f7f\u7528\u53cd\u5c04\u8fdb\u884c\u8bb8\u591a\u5185\u90e8\u5904\u7406\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u53cd\u5c04\u6709\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n

    \n
  • \n
      \u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\uff01<\/ul>\n<\/li>\n<\/ul>\n

       <\/p>\n

        \n
      • \n
          \u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8aad\u307e\u305a\u3068\u3082\u3001\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u5185\u90e8\u306e\u51e6\u7406\u304c\u30a4\u30e1\u30fc\u30b8\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\uff01<\/ul>\n<\/li>\n<\/ul>\n

           <\/p>\n

            \n
          • \n
              \u81ea\u5206\u3067\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f5c\u308c\u308b\u3088\u3046\u306b\u306a\u308b\uff01<\/ul>\n<\/li>\n<\/ul>\n

              \u8fd1\u5e74\u306eJava\u3067\u306f\u65e2\u5b58\u306eOSS\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u3042\u3093\u307e\u308a\u3084\u3089\u306a\u3044\u304b\u3082\u3067\u3059\u304c<\/p>\n

              \u975e\u5e38\u5efa\u8bae\u4e86\u89e3\u53cd\u601d\uff0c\u4ece\u521d\u7ea7\u6bd5\u4e1a\u5e76\u664b\u5347\u4e3a\u4e2d\u7ea7Java\u5de5\u7a0b\u5e08\uff01<\/p>\n

              \u5728\u5e73\u5e38\u7684\u5de5\u4f5c\u4e2d\uff0c\u4e0d\u5efa\u8bae\u5728\u7f16\u5199\u4e1a\u52a1\u903b\u8f91\u7b49\u65f6\u4f7f\u7528\u53cd\u5c04\uff0c\u8bf7\u6ce8\u610f\uff08\u539f\u56e0\u5c06\u5728\u540e\u6587\u8be6\u8ff0\uff09\u3002<\/p>\n

              \u53cd\u601d\u7684\u57fa\u672c\u539f\u7406<\/h1>\n

              \u73ed\u7ea7<\/h2>\n

              Class\u7c7b\u662f\u4e00\u4e2a\u8868\u793a\u7c7b\u7684\u7c7b\u3002\u5b83\u5728\u53cd\u5c04\u4e2d\u8d77\u7740\u6838\u5fc3\u7684\u4f5c\u7528\u3002<\/p>\n

              Class\u7c7b\u7684\u5b9a\u4e49\u662f\u5e26\u6709\u6cdb\u578b\u7684Class\u3002T\u8868\u793a\u6307\u5b9a\u7684\u7c7b\u3002<\/p>\n

              \u6bcf\u4e2a\u7c7b\u90fd\u4f1a\u9690\u5f0f\u5730\u521b\u5efa\u7c7b\u4f3c\u4e8e\u540d\u4e3a”class”\u7684\u9759\u6001\u5b57\u6bb5\u7684\u4e1c\u897f\u3002\u8fd9\u4e2a\u7c7b\u4f3c\u5b57\u6bb5\u4e2d\u88ab\u8d4b\u503c\u4e3a\u4ee3\u8868\u8be5\u7c7b\u7684Class\u5b9e\u4f8b\u3002<\/p>\n

              \u6362\u8a00\u4e4b\uff0c\u53ef\u4ee5\u60f3\u8c61\u51fa\u8fd9\u6837\u4e00\u4e2a\u9886\u57df\u3002<\/p>\n

              public<\/span> class<\/span> Hoge<\/span> {<\/span>\r\n    public<\/span> static<\/span> final<\/span> Class<\/span><<\/span>Hoge<\/span>><\/span> class<\/span> =<\/span> (<\/span>Hoge\u3092\u8868\u3059Class\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
              “.class”\u88ab\u51c6\u786e\u5730\u79f0\u4e3a”\u7c7b\u6587\u5b57”\uff0c\u5e76\u4e0d\u662f\u4e00\u4e2a\u5b57\u6bb5\uff08\u53c2\u8003URL\uff09\u3002\u7136\u800c\uff0c\u5728\u524d\u8ff0\u7684\u89e3\u91ca\u4e2d\uff0c\u4e3a\u4e86\u5f62\u8c61\u5316\uff0c\u6211\u4eec\u5c06\u5176\u63cf\u8ff0\u4e3a\u201c\u7c7b\u4f3c\u4e8e\u5b57\u6bb5\u7684\u4e1c\u897f\u201d\u3002<\/p><\/blockquote>\n
              \u9664\u6b64\u4e4b\u5916\uff0c\u6240\u6709\u7684\u7c7b\u90fd\u5b9a\u4e49\u4e86\u4e00\u4e2agetClass()\u65b9\u6cd5\uff08\u5728java.lang.Object\u7c7b\u4e2d\u5b9a\u4e49\uff09\u3002\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u662f\u4e0e.class\u76f8\u540c\u7684\u201c\u8868\u793a\u8be5\u7c7b\u7684Class\u5b9e\u4f8b\u201d\u3002<\/p>\n
              Hoge<\/span> hoge<\/span> =<\/span> new<\/span> Hoge<\/span>();<\/span>\r\nClass<\/span><<\/span>Hoge<\/span>><\/span> clazz<\/span> =<\/span> hoge<\/span>.<\/span>getClass<\/span>();<\/span>\r\n<\/code><\/pre>\n
              \u83b7\u53d6\u7c7b\u540d<\/h2>\n
              \u5728Class\u7c7b\u4e2d\uff0c\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u6765\u83b7\u53d6\u7c7b\u540d\u3002<\/p>\n
              \n
              \u30e1\u30bd\u30c3\u30c9\u540d\u8aac\u660egetName()<\/code>\u5b8c\u5168\u4fee\u98fe\u30af\u30e9\u30b9\u540d\uff08FQCN\uff09\u3092\u8fd4\u3059getSimpleName()<\/code>\u5358\u7d14\u30af\u30e9\u30b9\u540d\u3092\u8fd4\u3059<\/div>\n<\/div>\n
              Class<\/span><?><\/span> clazz<\/span> =<\/span> Object<\/span>.<\/span>class<\/span>;<\/span>\r\nString<\/span> fqcn<\/span> =<\/span> clazz<\/span>.<\/span>getName<\/span>();<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>fqcn<\/span>);<\/span>\r\nString<\/span> name<\/span> =<\/span> clazz<\/span>.<\/span>getSimpleName<\/span>();<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>name<\/span>);<\/span>\r\n<\/code><\/pre>\n
              java.lang.Object\r\nObject\r\n<\/code><\/pre>\n
              \u4f7f\u7528\u53cd\u5c04\u751f\u6210\u5b9e\u4f8b\u3002<\/h2>\n
              \u5047\u8bbe\u6709\u4e00\u4e2a\u6837\u672c\u7c7b\uff0c\u6bd4\u5982\u8bf4\u53eb\u505aSample\u3002<\/p>\n
              package<\/span> com.example<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Sample<\/span> {<\/span>\r\n\r\n    private<\/span> int<\/span> value<\/span>;<\/span>\r\n\r\n    public<\/span> Sample<\/span>(<\/span>int<\/span> value<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>value<\/span> =<\/span> value<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> multi<\/span>(<\/span>int<\/span> value2<\/span>)<\/span> {<\/span>\r\n        return<\/span> value<\/span> *<\/span> value2<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> String<\/span> toString<\/span>()<\/span> {<\/span>\r\n        return<\/span> \"Sample{\"<\/span> +<\/span>\r\n                \"value=\"<\/span> +<\/span> value<\/span> +<\/span>\r\n                '}'<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
              \u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Class.forName()\u65b9\u6cd5\u6765\u751f\u6210\u8868\u793aSample\u7c7b\u7684Class\u5b9e\u4f8b\u3002\u5728\u53c2\u6570\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6307\u5b9aSample\u7c7b\u7684\u5b8c\u6574\u9650\u5b9a\u540d\u3002<\/p>\n
              \/\/ Sample\u30af\u30e9\u30b9\u3092\u8868\u3059Class\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b<\/span>\r\nClass<\/span><?><\/span> sampleClass<\/span> =<\/span> Class<\/span>.<\/span>forName<\/span>(<\/span>\"com.example.Sample\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
              \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4f7f\u7528getConstructor()\u65b9\u6cd5\u83b7\u53d6Sample\u7c7b\u7684\u6784\u9020\u51fd\u6570\u3002\u5728\u53c2\u6570\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6307\u5b9a\u6240\u9700\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\u3002<\/p>\n
              \/\/ Sample\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u53d6\u5f97\u3059\u308b<\/span>\r\nConstructor<\/span><?><\/span> constructor<\/span> =<\/span> sampleClass<\/span>.<\/span>getConstructor<\/span>(<\/span>int<\/span>.<\/span>class<\/span>);<\/span>\r\n<\/code><\/pre>\n
              \u57fa\u672c\u6570\u636e\u7c7b\u578b\u5982int\u53ef\u4ee5\u4f7f\u7528\u7c7b\u5b57\u9762\u5e38\u91cf\uff08.class\uff09\u8fdb\u884c\u64cd\u4f5c\u3002<\/p><\/blockquote>\n
              \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u53d6\u5f97\u7684\u6784\u9020\u51fd\u6570\u7684newInstance()\u65b9\u6cd5\u6765\u521b\u5efaSample\u7684\u5b9e\u4f8b\u3002\u60a8\u9700\u8981\u5728\u53c2\u6570\u4e2d\u6307\u5b9a\u4f20\u9012\u7ed9\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u3002<\/p>\n
              \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5229\u7528\u3057\u3066Sample\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b<\/span>\r\nObject<\/span> sampleInstance<\/span> =<\/span> constructor<\/span>.<\/span>newInstance<\/span>(<\/span>100<\/span>);<\/span>\r\n<\/code><\/pre>\n
              \u6211\u4eec\u6765\u786e\u8ba4\u4e00\u4e0b\u662f\u5426\u771f\u7684\u751f\u6210\u4e86Sample\u5b9e\u4f8b\u3002<\/p>\n
              \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u72b6\u614b\u3092\u8868\u793a<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>sampleInstance<\/span>);<\/span>\r\n<\/code><\/pre>\n
              \u5728\u5177\u6709\u8bbe\u5b9a\u4e3a100\u7684value\u5b57\u6bb5\u503c\u7684Sample\u5b9e\u4f8b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u5b9a\u5b83\u7684\u5b58\u5728\u3002<\/p>\n
              Sample{<\/span>value<\/span>=<\/span>100}<\/span>\r\n<\/code><\/pre>\n
              \u5904\u7406\u9886\u57df<\/h2>\n
              \u5728Class\u7c7b\u4e2d\u6709\u51e0\u4e2a\u7528\u4e8e\u83b7\u53d6\u5b57\u6bb5\u7684\u65b9\u6cd5\u3002<\/p>\n
                \n
              • \n
                  Field getField(String name)<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    Field getDeclaredField(String name)<\/ul>\n
                    \u8fd9\u662f\u4e00\u4e2a\u7528\u4e8e\u83b7\u53d6\u7531”name”\u6307\u5b9a\u7684\u5b57\u6bb5\u7684\u65b9\u6cd5\uff0c\u5b83\u4eec\u4e4b\u95f4\u7684\u533a\u522b\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
                    \n
                    \u30e1\u30bd\u30c3\u30c9\u540dpublic\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u53d6\u5f97public\u4ee5\u5916\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u53d6\u5f97\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u53d6\u5f97getField()<\/code>\u25cb\u00d7\u25cbgetDeclaredField()<\/code>\u25cb\u25cb\u00d7<\/div>\n<\/div>\n
                    \u8fd8\u6709\u4e00\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56deField\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u6bd4\u5982getFields()\u548cgetDeclaredFields()\u65b9\u6cd5\u3002<\/p><\/blockquote>\n
                    \u7531\u65bc\u6b64\u6b21\u7684\u60c5\u6cc1\u662fvalue\u5b57\u6bb5\u88ab\u8a2d\u70ba\u79c1\u6709\uff0c\u56e0\u6b64\u6211\u5011\u5c07\u4f7f\u7528\u5f8c\u8005\u3002<\/p>\n
                    \/\/ value\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u53d6\u5f97<\/span>\r\nField<\/span> valueField<\/span> =<\/span> sampleClass<\/span>.<\/span>getDeclaredField<\/span>(<\/span>\"value\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
                    \u5f53\u5c06setAccessible()\u65b9\u6cd5\u8bbe\u4e3atrue\u65f6\uff0c\u5373\u4f7f\u662fprivate\u5b57\u6bb5\uff0c\u4e5f\u53ef\u4ee5\u83b7\u53d6\u5176\u503c\u6216\u8fdb\u884c\u8d4b\u503c\u3002<\/p>\n
                    \/\/ value\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092\u53d6\u5f97<\/span>\r\nObject<\/span> value<\/span> =<\/span> valueField<\/span>.<\/span>get<\/span>(<\/span>sampleInstance<\/span>);<\/span>\r\n\/\/ value\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024200\u3092\u8a2d\u5b9a<\/span>\r\nvalueField<\/span>.<\/span>set<\/span>(<\/span>sampleInstance<\/span>,<\/span> 200<\/span>);<\/span>\r\n<\/code><\/pre>\n
                    \u5904\u7406\u65b9\u6cd5<\/h2>\n
                    \u5728Class\u7c7b\u4e2d\uff0c\u6709\u51e0\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u65b9\u6cd5\u3002<\/p>\n
                      \n
                    • \n
                        Method getMethod(String name, Class<?>… parameterTypes)<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          Method getDeclaredMethod(String name, Class<?>… parameterTypes)<\/ul>\n
                          \u4ee5\u4e0b\u662f\u4e00\u79cd\u9009\u62e9\u6027\u7684\u4e2d\u6587\u91ca\u4e49\uff1a
                          \n\u8fd9\u662f\u4e00\u4e2a\u7528\u4e8e\u83b7\u53d6\u7531name\u6307\u5b9a\u7684\u65b9\u6cd5\u7684\u65b9\u6cd5\u3002\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n
                          \n
                          \u30e1\u30bd\u30c3\u30c9\u540dpublic\u30e1\u30bd\u30c3\u30c9\u306e\u53d6\u5f97public\u4ee5\u5916\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u53d6\u5f97\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u53d6\u5f97getMethod()<\/code>\u25cb\u00d7\u25cbgetDeclaredMethod()<\/code>\u25cb\u25cb\u00d7<\/div>\n<\/div>\n
                          \u8fd8\u6709\u4e00\u4e9b\u65b9\u6cd5\u4f1a\u8fd4\u56deMethod\u6570\u7ec4\uff0c\u4f8b\u5982getMethods()\u548cgetDeclaredMethods()\u3002<\/p><\/blockquote>\n
                          \u8fd9\u6b21\u6211\u4eec\u5c06\u5229\u7528\u524d\u8005\u3002<\/p>\n
                          \/\/ multi\u30e1\u30bd\u30c3\u30c9\u306e\u53d6\u5f97<\/span>\r\nMethod<\/span> multiMethod<\/span> =<\/span> sampleClass<\/span>.<\/span>getMethod<\/span>(<\/span>\"multi\"<\/span>,<\/span> int<\/span>.<\/span>class<\/span>);<\/span>\r\n<\/code><\/pre>\n
                          \u5728\u6267\u884c\u83b7\u53d6\u7684\u65b9\u6cd5\u65f6\uff0c\u9700\u8981\u5728invoke\uff08\uff09\u65b9\u6cd5\u4e2d\u6307\u5b9a\u8981\u6267\u884c\u7684\u65b9\u6cd5\u5b9e\u4f8b\u548c\u8981\u4f20\u9012\u7684\u53c2\u6570\u503c\u3002<\/p>\n
                          \/\/ multi\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c<\/span>\r\nObject<\/span> ret<\/span> =<\/span> multiMethod<\/span>.<\/span>invoke<\/span>(<\/span>sampleInstance<\/span>,<\/span> 2<\/span>);<\/span>  \/\/ 100 * 2 = 200\u304c\u623b\u308a\u5024\u3068\u306a\u308b<\/span>\r\n<\/code><\/pre>\n
                          \u4e0eField\u7c7b\u4e00\u6837\uff0cMethod\u7c7b\u4e5f\u6709setAccessible()\u65b9\u6cd5\u3002<\/p><\/blockquote>\n
                          \u4f7f\u7528\u6807\u6ce8<\/h1>\n
                          \u81ea\u5236\u6807\u6ce8<\/h2>\n
                          “Annotation” refers to those starting with “@” such as Java’s standard “@Override” or Spring’s “@RequestMapping”.<\/p>\n
                          \u6ce8\u91ca\u53ef\u4ee5\u7531\u81ea\u5df1\u521b\u5efa\u3002 .)<\/p>\n
                          package<\/span> com.example<\/span>;<\/span>\r\n\r\nimport<\/span> java.lang.annotation.Documented<\/span>;<\/span>\r\nimport<\/span> java.lang.annotation.ElementType<\/span>;<\/span>\r\nimport<\/span> java.lang.annotation.Retention<\/span>;<\/span>\r\nimport<\/span> java.lang.annotation.RetentionPolicy<\/span>;<\/span>\r\nimport<\/span> java.lang.annotation.Target<\/span>;<\/span>\r\n\r\n\/\/ \u5b9f\u884c\u6642\u306b\u3082\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u60c5\u5831\u3092\u6b8b\u3059<\/span>\r\n@Retention<\/span>(<\/span>RetentionPolicy<\/span>.<\/span>RUNTIME<\/span>)<\/span>\r\n\/\/ \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u3089\u308c\u308b\u7b87\u6240\u3092\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306b\u6307\u5b9a\u3059\u308b<\/span>\r\n@Target<\/span>({<\/span>ElementType<\/span>.<\/span>TYPE<\/span>})<\/span>\r\n\/\/ \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u305f\u3053\u3068\u304cJavadoc\u306b\u3082\u63b2\u8f09\u3055\u308c\u308b<\/span>\r\n@Documented<\/span>\r\npublic<\/span> @interface<\/span> MyAnnotation<\/span> {<\/span>\r\n    String<\/span> name<\/span>()<\/span> default<\/span> \"default\"<\/span>;<\/span>\r\n    int<\/span> value<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                          \u5728\u521b\u5efa\u6ce8\u89e3\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528@interface\u800c\u4e0d\u662fclass\u6765\u58f0\u660e\u3002<\/p>\n
                          \u6807\u6ce8\u5143\u7d20<\/h3>\n
                          \u7c7b\u4f3c\u4e8e\u5728MyAnnotation\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u7684\u4e1c\u897f\u662f\u5143\u7d20\u3002<\/p>\n
                          \u5e38\u5e38\u88ab\u79f0\u4e3a”\u5c5e\u6027”\uff0c\u4f46\u7528\u82f1\u8bed\u4e5f\u53ef\u4ee5\u53eb\u4f5c”element”\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a”\u8981\u7d20”\u662f\u6b63\u786e\u7684\u3002<\/p><\/blockquote>\n
                          \u8fd9\u6b21\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5143\u7d20\uff0c\u5b83\u53eb\u505aname\u548cvalue\u3002<\/p>\n
                          \u5728\u540d\u5b57\u8981\u7d20\u4e2d\u4f7f\u7528default\u5173\u952e\u5b57\u6765\u8bbe\u7f6e\u9ed8\u8ba4\u503c\u3002<\/p>\n
                          @\u4fdd\u7559<\/h3>\n
                          @Retention\u7528\u4e8e\u6307\u5b9a@MyAnnotation\u7684\u4fe1\u606f\u662f\u5426\u5728\u7c7b\u6587\u4ef6\u6216\u8fd0\u884c\u65f6\u4fdd\u7559\u3002<\/p>\n
                          \n
                          RetentionPolicy<\/code>\u8aac\u660eRUNTIME<\/code>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u306b\u8a18\u9332\u3055\u308c\u3001\u304b\u3064\u5b9f\u884c\u6642\u3082JVM\u306b\u3088\u3063\u3066\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002CLASS<\/code>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u306b\u8a18\u9332\u3055\u308c\u308b\u4e00\u65b9\u3001\u5b9f\u884c\u6642\u306fJVM\u306b\u3088\u3063\u3066\u4fdd\u6301\u3055\u308c\u307e\u305b\u3093\u3002SOURCE<\/code>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u306b\u8a18\u9332\u3055\u308c\u307e\u305b\u3093\u3002<\/div>\n<\/div>\n
                          \u5982\u679c\u6ca1\u6709\u6dfb\u52a0@Retention\uff0c\u5c06\u88ab\u89c6\u4e3a\u4e0eCLASS\u76f8\u540c\u7684\u5f85\u9047\u3002<\/p><\/blockquote>\n
                          @\u76ee\u6807<\/h3>\n
                          @Target\u6ce8\u89e3\u901a\u8fc7\u4f7f\u7528ElementType\u679a\u4e3e\u7c7b\u578b\u6765\u6307\u5b9a@MyAnnotation\u53ef\u4ee5\u6dfb\u52a0\u5728\u65b9\u6cd5\u3001\u5b57\u6bb5\u7b49\u4f4d\u7f6e\u3002<\/p>\n
                          \n
                          \u4e3b\u306aElementType<\/code>\u8aac\u660eCONSTRUCTOR<\/code>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bfFIELD<\/code>\u30d5\u30a3\u30fc\u30eb\u30c9METHOD<\/code>\u30e1\u30bd\u30c3\u30c9TYPE<\/code>\u30af\u30e9\u30b9\u3001\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306a\u3069\u578b\u306e\u5ba3\u8a00<\/div>\n<\/div>\n
                          \u5982\u679c\u60a8\u60f3\u67e5\u770b\u6240\u6709\u7684ElementType\uff0c\u8bf7\u53c2\u9605Javadoc\u3002<\/p>\n
                          \u5982\u679c\u4e0d\u52a0@Target\uff0c\u9664\u4e86\u7c7b\u578b\u53c2\u6570\u4e4b\u5916\u7684\u6240\u6709\u5730\u65b9\u90fd\u53ef\u4ee5\u6dfb\u52a0\u3002<\/p><\/blockquote>\n
                          @\u5df2\u8bb0\u5f55<\/h3>\n
                          \u53ea\u8981\u5728\u7c7b\u4e0a\u6dfb\u52a0@Documented\u6ce8\u89e3\uff0c\u5c31\u4f1a\u5728\u4f7f\u7528@MyAnnotation\u6ce8\u89e3\u7684\u7c7b\u7684Javadoc\u4e2d\u51fa\u73b0\u201c\u8fd9\u4e2a\u7c7b\u88ab@MyAnnotation\u6ce8\u89e3\u4e86\u201d\u7684\u8bf4\u660e\u3002<\/p>\n
                          \u901a\u8fc7\u53cd\u5c04\u83b7\u53d6\u6ce8\u91ca\u3002<\/h2>\n
                          \u672c\u6b21\u5c06\u5728Sample\u7c7b\u4e0a\u6dfb\u52a0@MyAnnotation\u6ce8\u89e3\u3002<\/p>\n
                          @MyAnnotation<\/span>(<\/span>999<\/span>)<\/span>\r\npublic<\/span> class<\/span> Sample<\/span> {<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
                          \u5982\u679c\u53ea\u6307\u5b9a\u540d\u79f0\u4e3avalue\u7684\u5143\u7d20\uff0c\u5219\u53ef\u4ee5\u5199\u4e3a@MyAnnotation(999)\uff08\u4e5f\u53ef\u4ee5\u5199\u6210@MyAnnotation(value = 999)\uff09\u3002<\/p><\/blockquote>\n
                          \u82e5\u8981\u83b7\u53d6\u6dfb\u52a0\u5728\u7c7b\u4e0a\u7684\u6ce8\u89e3\uff0c\u8bf7\u4f7f\u7528Class\u7c7b\u7684getAnnotation()\u65b9\u6cd5\u3002\u5728\u53c2\u6570\u4e2d\u6307\u5b9a\u8981\u83b7\u53d6\u7684\u6ce8\u89e3\u7684\u7c7b\u578b\u3002<\/p>\n
                          \u8981\u83b7\u53d6\u5b57\u6bb5\u548c\u65b9\u6cd5\u4e0a\u6dfb\u52a0\u7684\u6ce8\u89e3\uff0c\u53ef\u4ee5\u4f7f\u7528Field\u7c7b\u548cMethod\u7c7b\u7684getAnnotation()\u65b9\u6cd5\u3002<\/p><\/blockquote>\n
                          Class<\/span><?><\/span> sampleClass<\/span> =<\/span> Class<\/span>.<\/span>forName<\/span>(<\/span>\"com.example.Sample\"<\/span>);<\/span>\r\n\/\/ \u30af\u30e9\u30b9\u306b\u4ed8\u3044\u305f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u53d6\u5f97<\/span>\r\nMyAnnotation<\/span> myAnnotation<\/span> =<\/span> sampleClass<\/span>.<\/span>getAnnotation<\/span>(<\/span>MyAnnotation<\/span>.<\/span>class<\/span>);<\/span>\r\n<\/code><\/pre>\n
                          \u83b7\u53d6\u6ce8\u91ca\u7684\u5143\u7d20\u503c\u5982\u4e0b\u3002<\/p>\n
                          \/\/ \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u5024\u3092\u53d6\u5f97<\/span>\r\nString<\/span> name<\/span> =<\/span> myAnnotation<\/span>.<\/span>name<\/span>();<\/span>  \/\/ \"default\"\u304c\u53d6\u5f97\u3067\u304d\u308b<\/span>\r\nint<\/span> value<\/span> =<\/span> myAnnotation<\/span>.<\/span>value<\/span>();<\/span>  \/\/ 999\u304c\u53d6\u5f97\u3067\u304d\u308b<\/span>\r\n<\/code><\/pre>\n
                          Proxy: \u4ee3\u7406<\/h1>\n
                          \u4ee3\u7406 \u662f\u6307<\/h2>\n
                          \u4ee3\u7406\u662f\u6307\u5728\u8fd0\u884c\u65f6\u521b\u5efa\u63a5\u53e3\u5b9e\u73b0\u7c7b\u53ca\u5176\u5b9e\u4f8b\u7684\u6280\u672f\uff0c\u4ee5\u53ca\u6307\u79f0\u6240\u521b\u5efa\u7684\u5b9e\u4f8b\u7684\u672f\u8bed\u3002<\/p>\n
                          \u5177\u4f53\u6765\u8bf4\uff0cJava\u7684java.lang.reflect\u5305\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3aProxy\u7684\u7c7b\u3002<\/p>\n
                          \u521b\u5efa\u4ee3\u7406\u670d\u52a1\u5668<\/h2>\n
                          \u8fd9\u6b21\uff0c\u6211\u5c06\u5c1d\u8bd5\u521b\u5efa\u8fd9\u6837\u4e00\u4e2a\u63a5\u53e3\u7684\u4ee3\u7406\u3002<\/p>\n
                          package<\/span> com.example<\/span>;<\/span>\r\n\r\npublic<\/span> interface<\/span> Command<\/span> {<\/span>\r\n    int<\/span> execute1<\/span>(<\/span>String<\/span> command<\/span>);<\/span>\r\n\r\n    int<\/span> execute2<\/span>(<\/span>String<\/span> command<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                          \u5b9e\u73b0\u8fd9\u4e2a\u63a5\u53e3\u7684\u7c7b\u548c\u5b83\u7684\u5b9e\u4f8b\u53ef\u4ee5\u901a\u8fc7Proxy.newProxyInstance()\u65b9\u6cd5\u6765\u521b\u5efa\u3002<\/p>\n
                          Command<\/span> c<\/span> =<\/span> (<\/span>Command<\/span>)<\/span> Proxy<\/span>.<\/span>newProxyInstance<\/span>(<\/span>\r\n          Command<\/span>.<\/span>class<\/span>.<\/span>getClassLoader<\/span>(),<\/span>\r\n          new<\/span> Class<\/span><?>[]{<\/span> Command<\/span>.<\/span>class<\/span> },<\/span>\r\n          new<\/span> CommandInvocationHandler<\/span>());<\/span>\r\n<\/code><\/pre>\n
                          \u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u7c7b\u52a0\u8f7d\u5668\u3002\u7c7b\u52a0\u8f7d\u5668\u662f\u8d1f\u8d23\u8bfb\u53d6\u7c7b\u6587\u4ef6\u7684\u89d2\u8272\u3002\u53ef\u4ee5\u4f7f\u7528InterfaceName.class.getClassLoader()\u6765\u83b7\u53d6\u3002<\/p>\n
                          \u5728\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\uff0c\u60a8\u53ef\u4ee5\u7528\u4e00\u4e2a\u6570\u7ec4\u6765\u6307\u5b9a\u4ee3\u7406\u5b9e\u73b0\u5e94\u8be5\u5305\u542b\u7684\u63a5\u53e3\u3002<\/p>\n
                          \u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u7528\u4e8e\u63cf\u8ff0\u5728\u4ee3\u7406\u5185\u90e8\u5904\u7406\u7684InvocationHandler\u5b9e\u73b0\u7c7b\uff08\u5982\u4e0b\u6240\u8ff0\uff09\u3002<\/p>\n
                          \u63cf\u8ff0\u5728\u4ee3\u7406\u670d\u52a1\u5668\u5185\u7684\u5904\u7406<\/h2>\n
                          \u5728\u5904\u7406\u6bcf\u4e2a\u4ee3\u7406\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff0c\u6211\u4eec\u9700\u8981\u5b9e\u73b0InvocationHandler\u63a5\u53e3\u6765\u63cf\u8ff0\u76f8\u5e94\u7684\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n
                          package<\/span> com.example<\/span>;<\/span>\r\n\r\nimport<\/span> java.lang.reflect.InvocationHandler<\/span>;<\/span>\r\nimport<\/span> java.lang.reflect.Method<\/span>;<\/span>\r\nimport<\/span> java.util.Objects<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> CommandInvocationHandler<\/span> implements<\/span> InvocationHandler<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> Object<\/span> invoke<\/span>(<\/span>Object<\/span> proxy<\/span>,<\/span> Method<\/span> method<\/span>,<\/span> Object<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Throwable<\/span> {<\/span>\r\n        if<\/span> (<\/span>Objects<\/span>.<\/span>equals<\/span>(<\/span>\"execute1\"<\/span>,<\/span> method<\/span>.<\/span>getName<\/span>()))<\/span> {<\/span>\r\n            \/\/ execute1()\u306e\u51e6\u7406<\/span>\r\n            if<\/span> (<\/span>\"UP\"<\/span>.<\/span>equals<\/span>(<\/span>args<\/span>[<\/span>0<\/span>]))<\/span> {<\/span>\r\n                return<\/span> 1<\/span>;<\/span>\r\n            }<\/span> else<\/span> if<\/span> (<\/span>\"DOWN\"<\/span>.<\/span>equals<\/span>(<\/span>args<\/span>[<\/span>0<\/span>]))<\/span> {<\/span>\r\n                return<\/span> 0<\/span>;<\/span>\r\n            }<\/span> else<\/span> {<\/span>\r\n                throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>\"Arg must be 'UP' or 'DOWN'\"<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        if<\/span> (<\/span>Objects<\/span>.<\/span>equals<\/span>(<\/span>\"execute2\"<\/span>,<\/span> method<\/span>.<\/span>getName<\/span>()))<\/span> {<\/span>\r\n            \/\/ execute2()\u306e\u51e6\u7406<\/span>\r\n            if<\/span> (<\/span>\"LEFT\"<\/span>.<\/span>equals<\/span>(<\/span>args<\/span>[<\/span>0<\/span>]))<\/span> {<\/span>\r\n                return<\/span> 2<\/span>;<\/span>\r\n            }<\/span> else<\/span> if<\/span> (<\/span>\"RIGHT\"<\/span>.<\/span>equals<\/span>(<\/span>args<\/span>[<\/span>0<\/span>]))<\/span> {<\/span>\r\n                return<\/span> 3<\/span>;<\/span>\r\n            }<\/span> else<\/span> {<\/span>\r\n                throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>\"Arg must be 'LEFT' or 'RIGHT'\"<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>\"Invalid method\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                          \u8c03\u7528\u4ee3\u7406<\/h2>\n
                          \u8ba9\u6211\u4eec\u663e\u793a\u5e76\u786e\u8ba4\u4e00\u4e0b\u5df2\u521b\u5efa\u7684\u4ee3\u7406\u7c7b\u7684\u540d\u79f0\u662f\u4ec0\u4e48\u3002<\/p>\n
                          \/\/ \u30af\u30e9\u30b9\u540d\u3092\u8868\u793a<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>c<\/span>.<\/span>getClass<\/span>().<\/span>getName<\/span>());<\/span>\r\n<\/code><\/pre>\n
                          \u5982\u679c\u770b\u5230com.sun.proxy.$ProxyN\u8fd9\u6837\u7684\u4e1c\u897f\uff0c\u90a3\u5c31\u662f\u4ee3\u7406\u5df2\u7ecf\u521b\u5efa\u7684\u8bc1\u636e\u3002<\/p>\n
                          com.sun.proxy.$Proxy0<\/span>\r\n<\/code><\/pre>\n
                          \u5f53\u8c03\u7528\u67d0\u4e2a\u65b9\u6cd5\u65f6\uff0c\u5c06\u6267\u884c\u5728InvocationHandler\u5b9e\u73b0\u7c7b\u4e2d\u7f16\u5199\u7684\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n
                          \/\/ execute1()\u306e\u547c\u3073\u51fa\u3057<\/span>\r\nint<\/span> ret1<\/span> =<\/span> c<\/span>.<\/span>execute1<\/span>(<\/span>\"UP\"<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ret1<\/span>);<\/span>\r\n\r\n\/\/ execute2()\u306e\u547c\u3073\u51fa\u3057<\/span>\r\nint<\/span> ret2<\/span> =<\/span> c<\/span>.<\/span>execute2<\/span>(<\/span>\"RIGHT\"<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ret2<\/span>);<\/span>\r\n\r\n\/\/ execute1()\u306e\u547c\u3073\u51fa\u3057\uff08\u4f8b\u5916\u767a\u751f\uff09<\/span>\r\nint<\/span> ret3<\/span> =<\/span> c<\/span>.<\/span>execute1<\/span>(<\/span>\"LEFT\"<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ret3<\/span>);<\/span>\r\n<\/code><\/pre>\n
                          1\r\n3\r\nException in <\/span>thread \"main\"<\/span> java.lang.IllegalArgumentException: Arg must be 'UP'<\/span> or 'DOWN'<\/span>\r\n    at com.example.CommandInvocationHandler.invoke(<\/span>CommandInvocationHandler.java:16)<\/span>\r\n    at com.sun.proxy.$Proxy0<\/span>.execute1(<\/span>Unknown Source)<\/span>\r\n    at com.example.ProxySample.main(<\/span>ProxySample.java:19)<\/span>\r\n<\/code><\/pre>\n
                          \u4f7f\u7528\u53cd\u601d\u7684\u65f6\u673a<\/h1>\n
                          \u5982\u4e4b\u524d\u6240\u8ff0\uff0c\u53cd\u5c04\u57fa\u672c\u4e0a\u662f\u7528\u4e8e\u521b\u5efa\u6846\u67b6\u548c\u5e93\u7684\u6280\u672f\u3002<\/p>\n
                          \u5982\u679c\u5728\u4e1a\u52a1\u903b\u8f91\u4e2d\u4f7f\u7528\u8fd9\u6837\u505a\uff0c\u7531\u4e8e\u9700\u8981\u5c06\u7c7b\u540d\u4ee5\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u5199\u51fa\u6765\uff0c\u6240\u4ee5\u5728\u540e\u671f\u8fdb\u884c\u7ef4\u62a4\u65f6\u4f1a\u53d8\u5f97\u975e\u5e38\u56f0\u96be\uff0c\u5f88\u96be\u627e\u5230\u8be5\u7c7b\u7684\u4f7f\u7528\u4f4d\u7f6e\u3002\u800c\u4e14\uff0c\u5982\u679c\u4f7f\u7528setAccessible()\u65b9\u6cd5\u5c06\u503c\u8d4b\u7ed9\u79c1\u6709\u5b57\u6bb5\uff0c\u90a3\u4e48\u539f\u672c\u5c01\u88c5\u8d77\u6765\u7684\u5185\u5bb9\u5c31\u4f1a\u53d8\u5f97\u6beb\u65e0\u610f\u4e49\u3002<\/p>\n
                          \u8bf7\u4e0d\u8981\u5728\u4e1a\u52a1\u903b\u8f91\u4e2d\u4f7f\u7528\u53cd\u5c04\uff0c\u518d\u6b21\u5f3a\u8c03\u4e00\u904d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                          \u9996\u5148 “Reflection” refers to the act of contem […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31448","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava\u53cd\u5c04\u7684\u5165\u95e8 - 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\/zh\/blog\/java\u53cd\u5c04\u7684\u5165\u95e8\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u53cd\u5c04\u7684\u5165\u95e8\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 “Reflection” refers to the act of contem […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u53cd\u5c04\u7684\u5165\u95e8\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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