{"id":132,"date":"2025-07-12T19:09:49","date_gmt":"2025-07-12T11:09:49","guid":{"rendered":"https:\/\/yingjun.run\/?p=132"},"modified":"2025-07-12T19:21:37","modified_gmt":"2025-07-12T11:21:37","slug":"java%e5%9f%ba%e7%a1%80%e9%87%8d%e7%82%b9","status":"publish","type":"post","link":"https:\/\/yingjun.run\/index.php\/2025\/07\/12\/java%e5%9f%ba%e7%a1%80%e9%87%8d%e7%82%b9\/","title":{"rendered":"Java\u57fa\u7840\u91cd\u70b9"},"content":{"rendered":"<h3><span class=\"ez-toc-section\" id=\"Java_%E5%80%BC%E4%BC%A0%E9%80%92%E8%AF%A6%E8%A7%A3\"><\/span>Java \u503c\u4f20\u9012\u8be6\u89e3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u5f62\u53c2&amp;\u5b9e\u53c2<\/strong><br \/>\n\u65b9\u6cd5\u7684\u5b9a\u4e49\u53ef\u80fd\u4f1a\u7528\u5230 \u53c2\u6570\uff08\u6709\u53c2\u7684\u65b9\u6cd5\uff09\uff0c\u53c2\u6570\u5728\u7a0b\u5e8f\u8bed\u8a00\u4e2d\u5206\u4e3a\uff1a<br \/>\n<strong>\u5b9e\u53c2<\/strong>\uff08\u5b9e\u9645\u53c2\u6570\uff0cArguments\uff09\uff1a\u7528\u4e8e\u4f20\u9012\u7ed9\u51fd\u6570\/\u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u5fc5\u987b\u6709\u786e\u5b9a\u7684\u503c\u3002<br \/>\n<strong>\u5f62\u53c2<\/strong>\uff08\u5f62\u5f0f\u53c2\u6570\uff0cParameters\uff09\uff1a\u7528\u4e8e\u5b9a\u4e49\u51fd\u6570\/\u65b9\u6cd5\uff0c\u63a5\u6536\u5b9e\u53c2\uff0c\u4e0d\u9700\u8981\u6709\u786e\u5b9a\u7684\u503c\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">String hello = &quot;Hello!&quot;;\n\/\/ hello \u4e3a\u5b9e\u53c2\nsayHello(hello);\n\/\/ str \u4e3a\u5f62\u53c2\nvoid sayHello(String str) {\n    System.out.println(str);\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E5%80%BC%E4%BC%A0%E9%80%92_%E5%BC%95%E7%94%A8%E4%BC%A0%E9%80%92\"><\/span>\u503c\u4f20\u9012&amp;\u5f15\u7528\u4f20\u9012<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u503c\u4f20\u9012\uff1a<\/strong>\u65b9\u6cd5\u63a5\u6536\u7684\u662f\u5b9e\u53c2\u503c\u7684\u62f7\u8d1d\uff0c\u4f1a\u521b\u5efa\u526f\u672c\u3002<br \/>\n<strong>\u5f15\u7528\u4f20\u9012<\/strong>\uff1a\u65b9\u6cd5\u63a5\u6536\u7684\u76f4\u63a5\u662f\u5b9e\u53c2\u6240\u5f15\u7528\u7684\u5bf9\u8c61\u5728\u5806\u4e2d\u7684\u5730\u5740\uff0c\u4e0d\u4f1a\u521b\u5efa\u526f\u672c\uff0c\u5bf9\u5f62\u53c2\u7684\u4fee\u6539\u5c06\u5f71\u54cd\u5230\u5b9e\u53c2\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E4%B8%BA%E4%BB%80%E4%B9%88_Java_%E5%8F%AA%E6%9C%89%E5%80%BC%E4%BC%A0%E9%80%92%EF%BC%8C%E4%B8%8D%E5%BC%95%E5%85%A5%E5%BC%95%E7%94%A8%E4%BC%A0%E9%80%92%E5%91%A2%EF%BC%9F\"><\/span>\u4e3a\u4ec0\u4e48 Java \u53ea\u6709\u503c\u4f20\u9012\uff0c\u4e0d\u5f15\u5165\u5f15\u7528\u4f20\u9012\u5462\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>1\u3001\u51fa\u4e8e\u5b89\u5168\u8003\u8651\uff0c\u65b9\u6cd5\u5185\u90e8\u5bf9\u503c\u8fdb\u884c\u7684\u64cd\u4f5c\uff0c\u5bf9\u4e8e\u8c03\u7528\u8005\u90fd\u662f\u672a\u77e5\u7684\uff08\u628a\u65b9\u6cd5\u5b9a\u4e49\u4e3a\u63a5\u53e3\uff0c\u8c03\u7528\u65b9\u4e0d\u5173\u5fc3\u5177\u4f53\u5b9e\u73b0\uff09\u3002\u4f60\u4e5f\u60f3\u8c61\u4e00\u4e0b\uff0c\u5982\u679c\u62ff\u7740\u94f6\u884c\u5361\u53bb\u53d6\u94b1\uff0c\u53d6\u7684\u662f 100\uff0c\u6263\u7684\u662f 200\uff0c\u662f\u4e0d\u662f\u5f88\u53ef\u6015\u3002<br \/>\n2\u3001Java \u4e4b\u7236 James Gosling \u5728\u8bbe\u8ba1\u4e4b\u521d\u5c31\u770b\u5230\u4e86 C\u3001C++ \u7684\u8bb8\u591a\u5f0a\u7aef\uff0c\u6240\u4ee5\u624d\u60f3\u7740\u53bb\u8bbe\u8ba1\u4e00\u95e8\u65b0\u7684\u8bed\u8a00 Java\u3002\u5728\u4ed6\u8bbe\u8ba1 Java \u7684\u65f6\u5019\u5c31\u9075\u5faa\u4e86\u7b80\u5355\u6613\u7528\u7684\u539f\u5219\uff0c\u6452\u5f03\u4e86\u8bb8\u591a\u5f00\u53d1\u8005\u4e00\u4e0d\u7559\u610f\u5c31\u4f1a\u9020\u6210\u95ee\u9898\u7684\u201c\u7279\u6027\u201d\uff0c\u8bed\u8a00\u672c\u8eab\u7684\u4e1c\u897f\u5c11\u4e86\uff0c\u5f00\u53d1\u8005\u8981\u5b66\u4e60\u7684\u4e1c\u897f\u4e5f\u5c11\u4e86\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%B8%B8%E8%A7%81%E5%BA%8F%E5%88%97%E5%8C%96%E5%8D%8F%E8%AE%AE%E6%9C%89%E5%93%AA%E4%BA%9B%EF%BC%9F\"><\/span>\u5e38\u89c1\u5e8f\u5217\u5316\u534f\u8bae\u6709\u54ea\u4e9b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>JDK \u81ea\u5e26\u7684\u5e8f\u5217\u5316\u65b9\u5f0f\u4e00\u822c\u4e0d\u4f1a\u7528 \uff0c\u56e0\u4e3a\u5e8f\u5217\u5316\u6548\u7387\u4f4e\u5e76\u4e14\u5b58\u5728\u5b89\u5168\u95ee\u9898\u3002\u6bd4\u8f83\u5e38\u7528\u7684\u5e8f\u5217\u5316\u534f\u8bae\u6709 Hessian\u3001Kryo\u3001Protobuf\u3001ProtoStuff\uff0c\u8fd9\u4e9b\u90fd\u662f\u57fa\u4e8e\u4e8c\u8fdb\u5236\u7684\u5e8f\u5217\u5316\u534f\u8bae\u3002\u50cf JSON \u548c XML \u8fd9\u79cd\u5c5e\u4e8e\u6587\u672c\u7c7b\u5e8f\u5217\u5316\u65b9\u5f0f\u3002\u867d\u7136\u53ef\u8bfb\u6027\u6bd4\u8f83\u597d\uff0c\u4f46\u662f\u6027\u80fd\u8f83\u5dee\uff0c\u4e00\u822c\u4e0d\u4f1a\u9009\u62e9\u3002<br \/>\nJDK \u81ea\u5e26\u7684\u5e8f\u5217\u5316\u65b9\u5f0f<br \/>\nJDK \u81ea\u5e26\u7684\u5e8f\u5217\u5316\uff0c\u53ea\u9700\u5b9e\u73b0 java.io.Serializable\u63a5\u53e3\u5373\u53ef\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">@AllArgsConstructor\n@NoArgsConstructor\n@Getter\n@Builder\n@ToString\npublic class RpcRequest implements Serializable {\n    private static final long serialVersionUID = 1905122041950251207L;\n    private String requestId;\n    private String interfaceName;\n    private String methodName;\n    private Object[] parameters;\n    private Class&lt;?&gt;[] paramTypes;\n    private RpcMessageTypeEnum rpcMessageTypeEnum;\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"serialVersionUID_%E6%9C%89%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8%EF%BC%9F\"><\/span>serialVersionUID \u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5e8f\u5217\u5316\u53f7 serialVersionUID \u5c5e\u4e8e\u7248\u672c\u63a7\u5236\u7684\u4f5c\u7528\u3002\u53cd\u5e8f\u5217\u5316\u65f6\uff0c\u4f1a\u68c0\u67e5 serialVersionUID \u662f\u5426\u548c\u5f53\u524d\u7c7b\u7684 serialVersionUID \u4e00\u81f4\u3002\u5982\u679c serialVersionUID \u4e0d\u4e00\u81f4\u5219\u4f1a\u629b\u51fa InvalidClassException \u5f02\u5e38\u3002\u5f3a\u70c8\u63a8\u8350\u6bcf\u4e2a\u5e8f\u5217\u5316\u7c7b\u90fd\u624b\u52a8\u6307\u5b9a\u5176 serialVersionUID\uff0c\u5982\u679c\u4e0d\u624b\u52a8\u6307\u5b9a\uff0c\u90a3\u4e48\u7f16\u8bd1\u5668\u4f1a\u52a8\u6001\u751f\u6210\u9ed8\u8ba4\u7684 serialVersionUID\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"serialVersionUID_%E4%B8%8D%E6%98%AF%E8%A2%AB_static_%E5%8F%98%E9%87%8F%E4%BF%AE%E9%A5%B0%E4%BA%86%E5%90%97%EF%BC%9F%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%98%E4%BC%9A%E8%A2%AB%E2%80%9C%E5%BA%8F%E5%88%97%E5%8C%96%E2%80%9D%EF%BC%9F\"><\/span>serialVersionUID \u4e0d\u662f\u88ab static \u53d8\u91cf\u4fee\u9970\u4e86\u5417\uff1f\u4e3a\u4ec0\u4e48\u8fd8\u4f1a\u88ab\u201c\u5e8f\u5217\u5316\u201d\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cstatic \u53d8\u91cf\u662f\u5c5e\u4e8e\u7c7b\u7684\uff0c\u4e0d\u5c5e\u4e8e\u4efb\u4f55\u5355\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u6240\u4ee5\u5b83\u4eec\u672c\u8eab\u4e0d\u4f1a\u88ab\u5305\u542b\u5728\u5bf9\u8c61\u5e8f\u5217\u5316\u7684\u6570\u636e\u6d41\u91cc\u3002\u5e8f\u5217\u5316\u4fdd\u5b58\u7684\u662f\u5bf9\u8c61\u7684\u72b6\u6001\uff08\u4e5f\u5c31\u662f\u5b9e\u4f8b\u53d8\u91cf\u7684\u503c\uff09\u3002\u7136\u800c\uff0cserialVersionUID \u662f\u4e00\u4e2a\u7279\u4f8b\uff0cserialVersionUID \u7684\u5e8f\u5217\u5316\u505a\u4e86\u7279\u6b8a\u5904\u7406\u3002\u5173\u952e\u5728\u4e8e\uff0cserialVersionUID \u4e0d\u662f\u4f5c\u4e3a\u5bf9\u8c61\u72b6\u6001\u7684\u4e00\u90e8\u5206\u88ab\u5e8f\u5217\u5316\u7684\uff0c\u800c\u662f\u88ab\u5e8f\u5217\u5316\u673a\u5236\u672c\u8eab\u7528\u4f5c\u4e00\u4e2a\u7279\u6b8a\u7684\u201c\u6307\u7eb9\u201d\u6216\u201c\u7248\u672c\u53f7\u201d<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%8E%A8%E8%8D%90%E4%BD%BF%E7%94%A8_JDK_%E8%87%AA%E5%B8%A6%E7%9A%84%E5%BA%8F%E5%88%97%E5%8C%96%EF%BC%9F\"><\/span>\u4e3a\u4ec0\u4e48\u4e0d\u63a8\u8350\u4f7f\u7528 JDK \u81ea\u5e26\u7684\u5e8f\u5217\u5316\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u4e0d\u652f\u6301\u8de8\u8bed\u8a00\u8c03\u7528<\/strong> : \u5982\u679c\u8c03\u7528\u7684\u662f\u5176\u4ed6\u8bed\u8a00\u5f00\u53d1\u7684\u670d\u52a1\u7684\u65f6\u5019\u5c31\u4e0d\u652f\u6301\u4e86\u3002<br \/>\n<strong>\u6027\u80fd\u5dee\uff1a<\/strong>\u76f8\u6bd4\u4e8e\u5176\u4ed6\u5e8f\u5217\u5316\u6846\u67b6\u6027\u80fd\u66f4\u4f4e\uff0c\u4e3b\u8981\u539f\u56e0\u662f\u5e8f\u5217\u5316\u4e4b\u540e\u7684\u5b57\u8282\u6570\u7ec4\u4f53\u79ef\u8f83\u5927\uff0c\u5bfc\u81f4\u4f20\u8f93\u6210\u672c\u52a0\u5927\u3002<br \/>\n<strong>\u5b58\u5728\u5b89\u5168\u95ee\u9898\uff1a<\/strong>\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u672c\u8eab\u5e76\u4e0d\u5b58\u5728\u95ee\u9898\u3002\u4f46\u5f53\u8f93\u5165\u7684\u53cd\u5e8f\u5217\u5316\u7684\u6570\u636e\u53ef\u88ab\u7528\u6237\u63a7\u5236\uff0c\u90a3\u4e48\u653b\u51fb\u8005\u5373\u53ef\u901a\u8fc7\u6784\u9020\u6076\u610f\u8f93\u5165\uff0c\u8ba9\u53cd\u5e8f\u5217\u5316\u4ea7\u751f\u975e\u9884\u671f\u7684\u5bf9\u8c61\uff0c\u5728\u6b64\u8fc7\u7a0b\u4e2d\u6267\u884c\u6784\u9020\u7684\u4efb\u610f\u4ee3\u7801<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%8F%8D%E5%B0%84%E7%9A%84%E5%BA%94%E7%94%A8%E5%9C%BA%E6%99%AF%E4%BA%86%E8%A7%A3%E4%B9%88%EF%BC%9F\"><\/span>\u53cd\u5c04\u7684\u5e94\u7528\u573a\u666f\u4e86\u89e3\u4e48\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u50cf\u54b1\u4eec\u5e73\u65f6\u5927\u90e8\u5206\u65f6\u5019\u90fd\u662f\u5728\u5199\u4e1a\u52a1\u4ee3\u7801\uff0c\u5f88\u5c11\u4f1a\u63a5\u89e6\u5230\u76f4\u63a5\u4f7f\u7528\u53cd\u5c04\u673a\u5236\u7684\u573a\u666f\u3002\u4f46\u662f\uff0c\u8fd9\u5e76\u4e0d\u4ee3\u8868\u53cd\u5c04\u6ca1\u6709\u7528\u3002\u76f8\u53cd\uff0c\u6b63\u662f\u56e0\u4e3a\u53cd\u5c04\uff0c\u4f60\u624d\u80fd\u8fd9\u4e48\u8f7b\u677e\u5730\u4f7f\u7528\u5404\u79cd\u6846\u67b6\u3002\u50cf Spring\/Spring Boot\u3001MyBatis \u7b49\u7b49\u6846\u67b6\u4e2d\u90fd\u5927\u91cf\u4f7f\u7528\u4e86\u53cd\u5c04\u673a\u5236\u3002<br \/>\n<strong>\u8fd9\u4e9b\u6846\u67b6\u4e2d\u4e5f\u5927\u91cf\u4f7f\u7528\u4e86\u52a8\u6001\u4ee3\u7406\uff0c\u800c\u52a8\u6001\u4ee3\u7406\u7684\u5b9e\u73b0\u4e5f\u4f9d\u8d56\u53cd\u5c04\u3002<\/strong><br \/>\n\u6bd4\u5982\u4e0b\u9762\u662f\u901a\u8fc7 JDK \u5b9e\u73b0\u52a8\u6001\u4ee3\u7406\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u5176\u4e2d\u5c31\u4f7f\u7528\u4e86\u53cd\u5c04\u7c7b Method \u6765\u8c03\u7528\u6307\u5b9a\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">public class DebugInvocationHandler implements InvocationHandler {\n    \/**\n     * \u4ee3\u7406\u7c7b\u4e2d\u7684\u771f\u5b9e\u5bf9\u8c61\n     *\/\n    private final Object target;\n\n    public DebugInvocationHandler(Object target) {\n        this.target = target;\n    }\n\n    public Object invoke(Object proxy, Method method, Object[] args) throws InvocationTargetException, IllegalAccessException {\n        System.out.println(&quot;before method &quot; + method.getName());\n        Object result = method.invoke(target, args);\n        System.out.println(&quot;after method &quot; + method.getName());\n        return result;\n    }\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E8%B0%88%E8%B0%88%E5%8F%8D%E5%B0%84%E6%9C%BA%E5%88%B6%E7%9A%84%E4%BC%98%E7%BC%BA%E7%82%B9\"><\/span>\u8c08\u8c08\u53cd\u5c04\u673a\u5236\u7684\u4f18\u7f3a\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u4f18\u70b9<\/strong>\uff1a\u53ef\u4ee5\u8ba9\u54b1\u4eec\u7684\u4ee3\u7801\u66f4\u52a0\u7075\u6d3b\u3001\u4e3a\u5404\u79cd\u6846\u67b6\u63d0\u4f9b\u5f00\u7bb1\u5373\u7528\u7684\u529f\u80fd\u63d0\u4f9b\u4e86\u4fbf\u5229<br \/>\n<strong>\u7f3a\u70b9<\/strong>\uff1a\u8ba9\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u6709\u4e86\u5206\u6790\u64cd\u4f5c\u7c7b\u7684\u80fd\u529b\uff0c\u8fd9\u540c\u6837\u4e5f\u589e\u52a0\u4e86\u5b89\u5168\u95ee\u9898\u3002\u6bd4\u5982\u53ef\u4ee5\u65e0\u89c6\u6cdb\u578b\u53c2\u6570\u7684\u5b89\u5168\u68c0\u67e5\uff08\u6cdb\u578b\u53c2\u6570\u7684\u5b89\u5168\u68c0\u67e5\u53d1\u751f\u5728\u7f16\u8bd1\u65f6\uff09\u3002\u53e6\u5916\uff0c\u53cd\u5c04\u7684\u6027\u80fd\u4e5f\u8981\u7a0d\u5dee\u70b9\uff0c\u4e0d\u8fc7\uff0c\u5bf9\u4e8e\u6846\u67b6\u6765\u8bf4\u5b9e\u9645\u662f\u5f71\u54cd\u4e0d\u5927\u7684\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E8%8E%B7%E5%8F%96_Class_%E5%AF%B9%E8%B1%A1%E7%9A%84%E5%9B%9B%E7%A7%8D%E6%96%B9%E5%BC%8F\"><\/span>\u83b7\u53d6 Class \u5bf9\u8c61\u7684\u56db\u79cd\u65b9\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">1. \u77e5\u9053\u5177\u4f53\u7c7b\u7684\u60c5\u51b5\u4e0b\u53ef\u4ee5\u4f7f\u7528\uff1a\nClass alunbarClass = TargetObject.class;\n\n2. \u901a\u8fc7 Class.forName()\u4f20\u5165\u7c7b\u7684\u5168\u8def\u5f84\u83b7\u53d6\uff1a\nClass alunbarClass1 = Class.forName(&quot;cn.javaguide.TargetObject&quot;);\n\n3. \u901a\u8fc7\u5bf9\u8c61\u5b9e\u4f8binstance.getClass()\u83b7\u53d6\uff1a\nTargetObject o = new TargetObject();\nClass alunbarClass2 = o.getClass();\n\n4. \u901a\u8fc7\u7c7b\u52a0\u8f7d\u5668xxxClassLoader.loadClass()\u4f20\u5165\u7c7b\u8def\u5f84\u83b7\u53d6:\nClassLoader.getSystemClassLoader().loadClass(&quot;cn.javaguide.TargetObject&quot;);<\/code><\/pre>\n<p>\u53cd\u5c04\u7684\u4e00\u4e9b\u57fa\u672c\u64cd\u4f5c\uff1a<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">\u521b\u5efa\u4e00\u4e2a\u6211\u4eec\u8981\u4f7f\u7528\u53cd\u5c04\u64cd\u4f5c\u7684\u7c7b TargetObject\u3002\npackage cn.javaguide;\n\npublic class TargetObject {\n    private String value;\n\n    public TargetObject() {\n        value = &quot;JavaGuide&quot;;\n    }\n\n    public void publicMethod(String s) {\n        System.out.println(&quot;I love &quot; + s);\n    }\n\n    private void privateMethod() {\n        System.out.println(&quot;value is &quot; + value);\n    }\n}\n\n\u4f7f\u7528\u53cd\u5c04\u64cd\u4f5c\u8fd9\u4e2a\u7c7b\u7684\u65b9\u6cd5\u4ee5\u53ca\u5c5e\u6027\n\npackage cn.javaguide;\n\nimport java.lang.reflect.Field;\nimport java.lang.reflect.InvocationTargetException;\nimport java.lang.reflect.Method;\n\npublic class Main {\n    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchFieldException {\n        \/**\n         * \u83b7\u53d6 TargetObject \u7c7b\u7684 Class \u5bf9\u8c61\u5e76\u4e14\u521b\u5efa TargetObject \u7c7b\u5b9e\u4f8b\n         *\/\n        Class&lt;?&gt; targetClass = Class.forName(&quot;cn.javaguide.TargetObject&quot;);\n        TargetObject targetObject = (TargetObject) targetClass.newInstance();\n        \/**\n         * \u83b7\u53d6 TargetObject \u7c7b\u4e2d\u5b9a\u4e49\u7684\u6240\u6709\u65b9\u6cd5\n         *\/\n        Method[] methods = targetClass.getDeclaredMethods();\n        for (Method method : methods) {\n            System.out.println(method.getName());\n        }\n\n        \/**\n         * \u83b7\u53d6\u6307\u5b9a\u65b9\u6cd5\u5e76\u8c03\u7528\n         *\/\n        Method publicMethod = targetClass.getDeclaredMethod(&quot;publicMethod&quot;,\n                String.class);\n\n        publicMethod.invoke(targetObject, &quot;JavaGuide&quot;);\n\n        \/**\n         * \u83b7\u53d6\u6307\u5b9a\u53c2\u6570\u5e76\u5bf9\u53c2\u6570\u8fdb\u884c\u4fee\u6539\n         *\/\n        Field field = targetClass.getDeclaredField(&quot;value&quot;);\n        \/\/\u4e3a\u4e86\u5bf9\u7c7b\u4e2d\u7684\u53c2\u6570\u8fdb\u884c\u4fee\u6539\u6211\u4eec\u53d6\u6d88\u5b89\u5168\u68c0\u67e5\n        field.setAccessible(true);\n        field.set(targetObject, &quot;JavaGuide&quot;);\n\n        \/**\n         * \u8c03\u7528 private \u65b9\u6cd5\n         *\/\n        Method privateMethod = targetClass.getDeclaredMethod(&quot;privateMethod&quot;);\n        \/\/\u4e3a\u4e86\u8c03\u7528private\u65b9\u6cd5\u6211\u4eec\u53d6\u6d88\u5b89\u5168\u68c0\u67e5\n        privateMethod.setAccessible(true);\n        privateMethod.invoke(targetObject);\n    }\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E4%BB%A3%E7%90%86%E6%A8%A1%E5%BC%8F\"><\/span>\u4ee3\u7406\u6a21\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4ee3\u7406\u6a21\u5f0f\u662f\u4e00\u79cd\u6bd4\u8f83\u597d\u7406\u89e3\u7684\u8bbe\u8ba1\u6a21\u5f0f\u3002\u7b80\u5355\u6765\u8bf4\u5c31\u662f \u6211\u4eec\u4f7f\u7528\u4ee3\u7406\u5bf9\u8c61\u6765\u4ee3\u66ff\u5bf9\u771f\u5b9e\u5bf9\u8c61(real object)\u7684\u8bbf\u95ee\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u539f\u76ee\u6807\u5bf9\u8c61\u7684\u524d\u63d0\u4e0b\uff0c\u63d0\u4f9b\u989d\u5916\u7684\u529f\u80fd\u64cd\u4f5c\uff0c\u6269\u5c55\u76ee\u6807\u5bf9\u8c61\u7684\u529f\u80fd\u3002\u4ee3\u7406\u6a21\u5f0f\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u6269\u5c55\u76ee\u6807\u5bf9\u8c61\u7684\u529f\u80fd\uff0c\u6bd4\u5982\u8bf4\u5728\u76ee\u6807\u5bf9\u8c61\u7684\u67d0\u4e2a\u65b9\u6cd5\u6267\u884c\u524d\u540e\u4f60\u53ef\u4ee5\u589e\u52a0\u4e00\u4e9b\u81ea\u5b9a\u4e49\u7684\u64cd\u4f5c\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752319253501.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E9%9D%99%E6%80%81%E4%BB%A3%E7%90%86\"><\/span>\u9759\u6001\u4ee3\u7406<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u9759\u6001\u4ee3\u7406\u4e2d\uff0c\u6211\u4eec\u5bf9\u76ee\u6807\u5bf9\u8c61\u7684\u6bcf\u4e2a\u65b9\u6cd5\u7684\u589e\u5f3a\u90fd\u662f\u624b\u52a8\u5b8c\u6210\u7684\uff08\u540e\u9762\u4f1a\u5177\u4f53\u6f14\u793a\u4ee3\u7801\uff09\uff0c\u975e\u5e38\u4e0d\u7075\u6d3b\uff08\u6bd4\u5982\u63a5\u53e3\u4e00\u65e6\u65b0\u589e\u52a0\u65b9\u6cd5\uff0c\u76ee\u6807\u5bf9\u8c61\u548c\u4ee3\u7406\u5bf9\u8c61\u90fd\u8981\u8fdb\u884c\u4fee\u6539\uff09\u4e14\u9ebb\u70e6(\u9700\u8981\u5bf9\u6bcf\u4e2a\u76ee\u6807\u7c7b\u90fd\u5355\u72ec\u5199\u4e00\u4e2a\u4ee3\u7406\u7c7b\uff09\u3002 \u5b9e\u9645\u5e94\u7528\u573a\u666f\u975e\u5e38\u975e\u5e38\u5c11\uff0c\u65e5\u5e38\u5f00\u53d1\u51e0\u4e4e\u770b\u4e0d\u5230\u4f7f\u7528\u9759\u6001\u4ee3\u7406\u7684\u573a\u666f\u3002\u4e0a\u9762\u6211\u4eec\u662f\u4ece\u5b9e\u73b0\u548c\u5e94\u7528\u89d2\u5ea6\u6765\u8bf4\u7684\u9759\u6001\u4ee3\u7406\uff0c\u4ece JVM \u5c42\u9762\u6765\u8bf4\uff0c \u9759\u6001\u4ee3\u7406\u5728\u7f16\u8bd1\u65f6\u5c31\u5c06\u63a5\u53e3\u3001\u5b9e\u73b0\u7c7b\u3001\u4ee3\u7406\u7c7b\u8fd9\u4e9b\u90fd\u53d8\u6210\u4e86\u4e00\u4e2a\u4e2a\u5b9e\u9645\u7684 class \u6587\u4ef6\u3002<br \/>\n\u9759\u6001\u4ee3\u7406\u5b9e\u73b0\u6b65\u9aa4:<br \/>\n1\u3001\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3\u53ca\u5176\u5b9e\u73b0\u7c7b\uff1b<br \/>\n2\u3001\u521b\u5efa\u4e00\u4e2a\u4ee3\u7406\u7c7b\u540c\u6837\u5b9e\u73b0\u8fd9\u4e2a\u63a5\u53e3<br \/>\n3\u3001\u5c06\u76ee\u6807\u5bf9\u8c61\u6ce8\u5165\u8fdb\u4ee3\u7406\u7c7b\uff0c\u7136\u540e\u5728\u4ee3\u7406\u7c7b\u7684\u5bf9\u5e94\u65b9\u6cd5\u8c03\u7528\u76ee\u6807\u7c7b\u4e2d\u7684\u5bf9\u5e94\u65b9\u6cd5\u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u901a\u8fc7\u4ee3\u7406\u7c7b\u5c4f\u853d\u5bf9\u76ee\u6807\u5bf9\u8c61\u7684\u8bbf\u95ee\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u76ee\u6807\u65b9\u6cd5\u6267\u884c\u524d\u540e\u505a\u4e00\u4e9b\u81ea\u5df1\u60f3\u505a\u7684\u4e8b\u60c5\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">1.\u5b9a\u4e49\u53d1\u9001\u77ed\u4fe1\u7684\u63a5\u53e3\n\npublic interface SmsService {\n    String send(String message);\n}\n\n2.\u5b9e\u73b0\u53d1\u9001\u77ed\u4fe1\u7684\u63a5\u53e3\n\npublic class SmsServiceImpl implements SmsService {\n    public String send(String message) {\n        System.out.println(&quot;send message:&quot; + message);\n        return message;\n    }\n}\n\n3.\u521b\u5efa\u4ee3\u7406\u7c7b\u5e76\u540c\u6837\u5b9e\u73b0\u53d1\u9001\u77ed\u4fe1\u7684\u63a5\u53e3\n\npublic class SmsProxy implements SmsService {\n\n    private final SmsService smsService;\n\n    public SmsProxy(SmsService smsService) {\n        this.smsService = smsService;\n    }\n\n    @Override\n    public String send(String message) {\n        \/\/\u8c03\u7528\u65b9\u6cd5\u4e4b\u524d\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u64cd\u4f5c\n        System.out.println(&quot;before method send()&quot;);\n        smsService.send(message);\n        \/\/\u8c03\u7528\u65b9\u6cd5\u4e4b\u540e\uff0c\u6211\u4eec\u540c\u6837\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u64cd\u4f5c\n        System.out.println(&quot;after method send()&quot;);\n        return null;\n    }\n}\n4.\u5b9e\u9645\u4f7f\u7528\n\npublic class Main {\n    public static void main(String[] args) {\n        SmsService smsService = new SmsServiceImpl();\n        SmsProxy smsProxy = new SmsProxy(smsService);\n        smsProxy.send(&quot;java&quot;);\n    }\n}\n\n\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u4e4b\u540e\uff0c\u63a7\u5236\u53f0\u6253\u5370\u51fa\uff1a\n\nbefore method send()\nsend message:java\nafter method send()<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86\"><\/span>\u52a8\u6001\u4ee3\u7406<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u76f8\u6bd4\u4e8e\u9759\u6001\u4ee3\u7406\u6765\u8bf4\uff0c\u52a8\u6001\u4ee3\u7406\u66f4\u52a0\u7075\u6d3b\u3002\u6211\u4eec\u4e0d\u9700\u8981\u9488\u5bf9\u6bcf\u4e2a\u76ee\u6807\u7c7b\u90fd\u5355\u72ec\u521b\u5efa\u4e00\u4e2a\u4ee3\u7406\u7c7b\uff0c\u5e76\u4e14\u4e5f\u4e0d\u9700\u8981\u6211\u4eec\u5fc5\u987b\u5b9e\u73b0\u63a5\u53e3\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u4ee3\u7406\u5b9e\u73b0\u7c7b( CGLIB \u52a8\u6001\u4ee3\u7406\u673a\u5236)\u3002<br \/>\n<strong>\u4ece JVM \u89d2\u5ea6\u6765\u8bf4\uff0c\u52a8\u6001\u4ee3\u7406\u662f\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7c7b\u5b57\u8282\u7801\uff0c\u5e76\u52a0\u8f7d\u5230 JVM \u4e2d\u7684\u3002<\/strong><\/p>\n<p>\u5c31 Java \u6765\u8bf4\uff0c\u52a8\u6001\u4ee3\u7406\u7684\u5b9e\u73b0\u65b9\u5f0f\u6709\u5f88\u591a\u79cd\uff0c\u6bd4\u5982 <strong>JDK \u52a8\u6001\u4ee3\u7406\u3001CGLIB \u52a8\u6001\u4ee3\u7406<\/strong>\u7b49\u7b49<\/p>\n<h3><span class=\"ez-toc-section\" id=\"JDK_%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E6%9C%BA%E5%88%B6\"><\/span>JDK \u52a8\u6001\u4ee3\u7406\u673a\u5236<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5728 Java \u52a8\u6001\u4ee3\u7406\u673a\u5236\u4e2d InvocationHandler \u63a5\u53e3\u548c Proxy \u7c7b\u662f\u6838\u5fc3\u3002Proxy \u7c7b\u4e2d\u4f7f\u7528\u9891\u7387\u6700\u9ad8\u7684\u65b9\u6cd5\u662f\uff1anewProxyInstance() \uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4e3b\u8981\u7528\u6765\u751f\u6210\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">    public static Object newProxyInstance(ClassLoader loader,\n                                          Class&lt;?&gt;[] interfaces,\n                                          InvocationHandler h)\n        throws IllegalArgumentException\n    {\n        ......\n    }<\/code><\/pre>\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u4e00\u5171\u6709 3 \u4e2a\u53c2\u6570\uff1a<br \/>\nloader :\u7c7b\u52a0\u8f7d\u5668\uff0c\u7528\u4e8e\u52a0\u8f7d\u4ee3\u7406\u5bf9\u8c61\u3002<br \/>\ninterfaces : \u88ab\u4ee3\u7406\u7c7b\u5b9e\u73b0\u7684\u4e00\u4e9b\u63a5\u53e3\uff1b<br \/>\nh : \u5b9e\u73b0\u4e86 InvocationHandler \u63a5\u53e3\u7684\u5bf9\u8c61<\/p>\n<p>\u8981\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406\u7684\u8bdd\uff0c\u8fd8\u5fc5\u987b\u9700\u8981\u5b9e\u73b0InvocationHandler \u6765\u81ea\u5b9a\u4e49\u5904\u7406\u903b\u8f91\u3002 \u5f53\u6211\u4eec\u7684\u52a8\u6001\u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8c03\u7528\u5c31\u4f1a\u88ab\u8f6c\u53d1\u5230\u5b9e\u73b0InvocationHandler \u63a5\u53e3\u7c7b\u7684 invoke \u65b9\u6cd5\u6765\u8c03\u7528\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">public interface InvocationHandler {\n\n    \/**\n     * \u5f53\u4f60\u4f7f\u7528\u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u65b9\u6cd5\u7684\u65f6\u5019\u5b9e\u9645\u4f1a\u8c03\u7528\u5230\u8fd9\u4e2a\u65b9\u6cd5\n     *\/\n    public Object invoke(Object proxy, Method method, Object[] args)\n        throws Throwable;\n}<\/code><\/pre>\n<p>invoke() \u65b9\u6cd5\u6709\u4e0b\u9762\u4e09\u4e2a\u53c2\u6570\uff1a<br \/>\nproxy :\u52a8\u6001\u751f\u6210\u7684\u4ee3\u7406\u7c7b<br \/>\nmethod : \u4e0e\u4ee3\u7406\u7c7b\u5bf9\u8c61\u8c03\u7528\u7684\u65b9\u6cd5\u76f8\u5bf9\u5e94<br \/>\nargs : \u5f53\u524d method \u65b9\u6cd5\u7684\u53c2\u6570<br \/>\n<strong>\u901a\u8fc7Proxy \u7c7b\u7684 newProxyInstance() \u521b\u5efa\u7684\u4ee3\u7406\u5bf9\u8c61\u5728\u8c03\u7528\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u5b9e\u9645\u4f1a\u8c03\u7528\u5230\u5b9e\u73b0InvocationHandler \u63a5\u53e3\u7684\u7c7b\u7684 invoke()\u65b9\u6cd5\u3002 \u4f60\u53ef\u4ee5\u5728 invoke() \u65b9\u6cd5\u4e2d\u81ea\u5b9a\u4e49\u5904\u7406\u903b\u8f91\uff0c\u6bd4\u5982\u5728\u65b9\u6cd5\u6267\u884c\u524d\u540e\u505a\u4ec0\u4e48\u4e8b\u60c5\u3002<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"JDK_%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E7%B1%BB%E4%BD%BF%E7%94%A8%E6%AD%A5%E9%AA%A4\"><\/span>JDK \u52a8\u6001\u4ee3\u7406\u7c7b\u4f7f\u7528\u6b65\u9aa4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>1\u3001\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3\u53ca\u5176\u5b9e\u73b0\u7c7b\uff1b<br \/>\n2\u3001\u81ea\u5b9a\u4e49 InvocationHandler \u5e76\u91cd\u5199invoke\u65b9\u6cd5\uff0c\u5728 invoke \u65b9\u6cd5\u4e2d\u6211\u4eec\u4f1a\u8c03\u7528\u539f\u751f\u65b9\u6cd5\uff08\u88ab\u4ee3\u7406\u7c7b\u7684\u65b9\u6cd5\uff09\u5e76\u81ea\u5b9a\u4e49\u4e00\u4e9b\u5904\u7406\u903b\u8f91\uff1b<br \/>\n3\u3001\u901a\u8fc7 Proxy.newProxyInstance(ClassLoader loader,Class&lt;?&gt;[] interfaces,InvocationHandler h) \u65b9\u6cd5\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61\uff1b<\/strong><\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">1.\u5b9a\u4e49\u53d1\u9001\u77ed\u4fe1\u7684\u63a5\u53e3\npublic interface SmsService {\n    String send(String message);\n}\n2.\u5b9e\u73b0\u53d1\u9001\u77ed\u4fe1\u7684\u63a5\u53e3\npublic class SmsServiceImpl implements SmsService {\n    public String send(String message) {\n        System.out.println(&quot;send message:&quot; + message);\n        return message;\n    }\n}\n3.\u5b9a\u4e49\u4e00\u4e2a JDK \u52a8\u6001\u4ee3\u7406\u7c7b\nimport java.lang.reflect.InvocationHandler;\nimport java.lang.reflect.InvocationTargetException;\nimport java.lang.reflect.Method;\n\n\/**\n * @author shuang.kou\n * @createTime 2020\u5e7405\u670811\u65e5 11:23:00\n *\/\npublic class DebugInvocationHandler implements InvocationHandler {\n    \/**\n     * \u4ee3\u7406\u7c7b\u4e2d\u7684\u771f\u5b9e\u5bf9\u8c61\n     *\/\n    private final Object target;\n\n    public DebugInvocationHandler(Object target) {\n        this.target = target;\n    }\n\n    @Override\n    public Object invoke(Object proxy, Method method, Object[] args) throws InvocationTargetException, IllegalAccessException {\n        \/\/\u8c03\u7528\u65b9\u6cd5\u4e4b\u524d\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u64cd\u4f5c\n        System.out.println(&quot;before method &quot; + method.getName());\n        Object result = method.invoke(target, args);\n        \/\/\u8c03\u7528\u65b9\u6cd5\u4e4b\u540e\uff0c\u6211\u4eec\u540c\u6837\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u64cd\u4f5c\n        System.out.println(&quot;after method &quot; + method.getName());\n        return result;\n    }\n}\n\ninvoke() \u65b9\u6cd5: \u5f53\u6211\u4eec\u7684\u52a8\u6001\u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u539f\u751f\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u6700\u7ec8\u5b9e\u9645\u4e0a\u8c03\u7528\u5230\u7684\u662f invoke() \u65b9\u6cd5\uff0c\u7136\u540e invoke() \u65b9\u6cd5\u4ee3\u66ff\u6211\u4eec\u53bb\u8c03\u7528\u4e86\u88ab\u4ee3\u7406\u5bf9\u8c61\u7684\u539f\u751f\u65b9\u6cd5\u3002\n\n4.\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u7684\u5de5\u5382\u7c7b\n\npublic class JdkProxyFactory {\n    public static Object getProxy(Object target) {\n        return Proxy.newProxyInstance(\n                target.getClass().getClassLoader(), \/\/ \u76ee\u6807\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\n                target.getClass().getInterfaces(),  \/\/ \u4ee3\u7406\u9700\u8981\u5b9e\u73b0\u7684\u63a5\u53e3\uff0c\u53ef\u6307\u5b9a\u591a\u4e2a\n                new DebugInvocationHandler(target)   \/\/ \u4ee3\u7406\u5bf9\u8c61\u5bf9\u5e94\u7684\u81ea\u5b9a\u4e49 InvocationHandler\n        );\n    }\n}\n\ngetProxy()\uff1a\u4e3b\u8981\u901a\u8fc7Proxy.newProxyInstance\uff08\uff09\u65b9\u6cd5\u83b7\u53d6\u67d0\u4e2a\u7c7b\u7684\u4ee3\u7406\u5bf9\u8c61\n\n5.\u5b9e\u9645\u4f7f\u7528\n\nSmsService smsService = (SmsService) JdkProxyFactory.getProxy(new SmsServiceImpl());\nsmsService.send(&quot;java&quot;);\n\n\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u4e4b\u540e\uff0c\u63a7\u5236\u53f0\u6253\u5370\u51fa\uff1a\n\nbefore method send\nsend message:java\nafter method send<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"CGLIB_%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E6%9C%BA%E5%88%B6\"><\/span>CGLIB \u52a8\u6001\u4ee3\u7406\u673a\u5236<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>JDK \u52a8\u6001\u4ee3\u7406\u6709\u4e00\u4e2a\u6700\u81f4\u547d\u7684\u95ee\u9898\u662f\u5176\u53ea\u80fd\u4ee3\u7406\u5b9e\u73b0\u4e86\u63a5\u53e3\u7684\u7c7b\u3002<br \/>\n\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u7528 CGLIB \u52a8\u6001\u4ee3\u7406\u673a\u5236\u6765\u907f\u514d\u3002<\/strong><\/p>\n<p>CGLIB(Code Generation Library)\u662f\u4e00\u4e2a\u57fa\u4e8eASM\u7684\u5b57\u8282\u7801\u751f\u6210\u5e93\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u5bf9\u5b57\u8282\u7801\u8fdb\u884c\u4fee\u6539\u548c\u52a8\u6001\u751f\u6210\u3002CGLIB \u901a\u8fc7\u7ee7\u627f\u65b9\u5f0f\u5b9e\u73b0\u4ee3\u7406\u3002\u5f88\u591a\u77e5\u540d\u7684\u5f00\u6e90\u6846\u67b6\u90fd\u4f7f\u7528\u5230\u4e86CGLIB\uff0c \u4f8b\u5982 Spring \u4e2d\u7684 AOP \u6a21\u5757\u4e2d\uff1a\u5982\u679c\u76ee\u6807\u5bf9\u8c61\u5b9e\u73b0\u4e86\u63a5\u53e3\uff0c\u5219\u9ed8\u8ba4\u91c7\u7528 JDK \u52a8\u6001\u4ee3\u7406\uff0c\u5426\u5219\u91c7\u7528 CGLIB \u52a8\u6001\u4ee3\u7406\u3002<\/p>\n<p><strong>\u5728 CGLIB \u52a8\u6001\u4ee3\u7406\u673a\u5236\u4e2d MethodInterceptor \u63a5\u53e3\u548c Enhancer \u7c7b\u662f\u6838\u5fc3<\/strong><\/p>\n<p>\u4f60\u9700\u8981\u81ea\u5b9a\u4e49 MethodInterceptor \u5e76\u91cd\u5199 intercept \u65b9\u6cd5\uff0cintercept \u7528\u4e8e\u62e6\u622a\u589e\u5f3a\u88ab\u4ee3\u7406\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">public interface MethodInterceptor\nextends Callback{\n    \/\/ \u62e6\u622a\u88ab\u4ee3\u7406\u7c7b\u4e2d\u7684\u65b9\u6cd5\n    public Object intercept(Object obj, java.lang.reflect.Method method, Object[] args,MethodProxy proxy) throws Throwable;\n}\nobj : \u88ab\u4ee3\u7406\u7684\u5bf9\u8c61\uff08\u9700\u8981\u589e\u5f3a\u7684\u5bf9\u8c61\uff09\nmethod : \u88ab\u62e6\u622a\u7684\u65b9\u6cd5\uff08\u9700\u8981\u589e\u5f3a\u7684\u65b9\u6cd5\uff09\nargs : \u65b9\u6cd5\u5165\u53c2\nproxy : \u7528\u4e8e\u8c03\u7528\u539f\u59cb\u65b9\u6cd5<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"CGLIB_%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E7%B1%BB%E4%BD%BF%E7%94%A8%E6%AD%A5%E9%AA%A4\"><\/span>CGLIB \u52a8\u6001\u4ee3\u7406\u7c7b\u4f7f\u7528\u6b65\u9aa4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>1\u3001\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff1b<br \/>\n2\u3001\u81ea\u5b9a\u4e49 MethodInterceptor \u5e76\u91cd\u5199 intercept \u65b9\u6cd5\uff0cintercept \u7528\u4e8e\u62e6\u622a\u589e\u5f3a\u88ab\u4ee3\u7406\u7c7b\u7684\u65b9\u6cd5\uff0c\u548c JDK \u52a8\u6001\u4ee3\u7406\u4e2d\u7684 invoke \u65b9\u6cd5\u7c7b\u4f3c\uff1b<br \/>\n3\u3001\u901a\u8fc7 Enhancer \u7c7b\u7684 create()\u521b\u5efa\u4ee3\u7406\u7c7b\uff1b<br \/>\n\u4e0d\u540c\u4e8e JDK \u52a8\u6001\u4ee3\u7406\u4e0d\u9700\u8981\u989d\u5916\u7684\u4f9d\u8d56\u3002CGLIB(Code Generation Library) \u5b9e\u9645\u662f\u5c5e\u4e8e\u4e00\u4e2a\u5f00\u6e90\u9879\u76ee\uff0c\u5982\u679c\u4f60\u8981\u4f7f\u7528\u5b83\u7684\u8bdd\uff0c\u9700\u8981\u624b\u52a8\u6dfb\u52a0\u76f8\u5173\u4f9d\u8d56\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-xml\">&lt;dependency&gt;\n  &lt;groupId&gt;cglib&lt;\/groupId&gt;\n  &lt;artifactId&gt;cglib&lt;\/artifactId&gt;\n  &lt;version&gt;3.3.0&lt;\/version&gt;\n&lt;\/dependency&gt;<\/code><\/pre>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">1.\u5b9e\u73b0\u4e00\u4e2a\u4f7f\u7528\u963f\u91cc\u4e91\u53d1\u9001\u77ed\u4fe1\u7684\u7c7b\n\npackage github.javaguide.dynamicProxy.cglibDynamicProxy;\n\npublic class AliSmsService {\n    public String send(String message) {\n        System.out.println(&quot;send message:&quot; + message);\n        return message;\n    }\n}\n\n2.\u81ea\u5b9a\u4e49 MethodInterceptor\uff08\u65b9\u6cd5\u62e6\u622a\u5668\uff09\n\nimport net.sf.cglib.proxy.MethodInterceptor;\nimport net.sf.cglib.proxy.MethodProxy;\n\nimport java.lang.reflect.Method;\n\n\/**\n * \u81ea\u5b9a\u4e49MethodInterceptor\n *\/\npublic class DebugMethodInterceptor implements MethodInterceptor {\n\n    \/**\n     * @param o           \u88ab\u4ee3\u7406\u7684\u5bf9\u8c61\uff08\u9700\u8981\u589e\u5f3a\u7684\u5bf9\u8c61\uff09\n     * @param method      \u88ab\u62e6\u622a\u7684\u65b9\u6cd5\uff08\u9700\u8981\u589e\u5f3a\u7684\u65b9\u6cd5\uff09\n     * @param args        \u65b9\u6cd5\u5165\u53c2\n     * @param methodProxy \u7528\u4e8e\u8c03\u7528\u539f\u59cb\u65b9\u6cd5\n     *\/\n    @Override\n    public Object intercept(Object o, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {\n        \/\/\u8c03\u7528\u65b9\u6cd5\u4e4b\u524d\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u64cd\u4f5c\n        System.out.println(&quot;before method &quot; + method.getName());\n        Object object = methodProxy.invokeSuper(o, args);\n        \/\/\u8c03\u7528\u65b9\u6cd5\u4e4b\u540e\uff0c\u6211\u4eec\u540c\u6837\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u64cd\u4f5c\n        System.out.println(&quot;after method &quot; + method.getName());\n        return object;\n    }\n\n}\n\n3.\u83b7\u53d6\u4ee3\u7406\u7c7b\n\nimport net.sf.cglib.proxy.Enhancer;\n\npublic class CglibProxyFactory {\n\n    public static Object getProxy(Class&lt;?&gt; clazz) {\n        \/\/ \u521b\u5efa\u52a8\u6001\u4ee3\u7406\u589e\u5f3a\u7c7b\n        Enhancer enhancer = new Enhancer();\n        \/\/ \u8bbe\u7f6e\u7c7b\u52a0\u8f7d\u5668\n        enhancer.setClassLoader(clazz.getClassLoader());\n        \/\/ \u8bbe\u7f6e\u88ab\u4ee3\u7406\u7c7b\n        enhancer.setSuperclass(clazz);\n        \/\/ \u8bbe\u7f6e\u65b9\u6cd5\u62e6\u622a\u5668\n        enhancer.setCallback(new DebugMethodInterceptor());\n        \/\/ \u521b\u5efa\u4ee3\u7406\u7c7b\n        return enhancer.create();\n    }\n}\n\n4.\u5b9e\u9645\u4f7f\u7528\n\nAliSmsService aliSmsService = (AliSmsService) CglibProxyFactory.getProxy(AliSmsService.class);\naliSmsService.send(&quot;java&quot;);\n\n\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u4e4b\u540e\uff0c\u63a7\u5236\u53f0\u6253\u5370\u51fa\uff1a\nbefore method send\nsend message:java\nafter method send<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"JDK_%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E5%92%8C_CGLIB_%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E5%AF%B9%E6%AF%94\"><\/span>JDK \u52a8\u6001\u4ee3\u7406\u548c CGLIB \u52a8\u6001\u4ee3\u7406\u5bf9\u6bd4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>JDK \u52a8\u6001\u4ee3\u7406\u53ea\u80fd\u4ee3\u7406\u5b9e\u73b0\u4e86\u63a5\u53e3\u7684\u7c7b\u6216\u8005\u76f4\u63a5\u4ee3\u7406\u63a5\u53e3\uff0c\u800c CGLIB \u53ef\u4ee5\u4ee3\u7406\u672a\u5b9e\u73b0\u4efb\u4f55\u63a5\u53e3\u7684\u7c7b\u3002 \u53e6\u5916\uff0c CGLIB \u52a8\u6001\u4ee3\u7406\u662f\u901a\u8fc7\u751f\u6210\u4e00\u4e2a\u88ab\u4ee3\u7406\u7c7b\u7684\u5b50\u7c7b\u6765\u62e6\u622a\u88ab\u4ee3\u7406\u7c7b\u7684\u65b9\u6cd5\u8c03\u7528\uff0c\u56e0\u6b64\u4e0d\u80fd\u4ee3\u7406\u58f0\u660e\u4e3a final \u7c7b\u578b\u7684\u7c7b\u548c\u65b9\u6cd5\u3002<br \/>\n\u5c31\u4e8c\u8005\u7684\u6548\u7387\u6765\u8bf4\uff0c\u5927\u90e8\u5206\u60c5\u51b5\u90fd\u662f JDK \u52a8\u6001\u4ee3\u7406\u66f4\u4f18\u79c0\uff0c\u968f\u7740 JDK \u7248\u672c\u7684\u5347\u7ea7\uff0c\u8fd9\u4e2a\u4f18\u52bf\u66f4\u52a0\u660e\u663e\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E9%9D%99%E6%80%81%E4%BB%A3%E7%90%86%E5%92%8C%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E7%9A%84%E5%AF%B9%E6%AF%94\"><\/span>\u9759\u6001\u4ee3\u7406\u548c\u52a8\u6001\u4ee3\u7406\u7684\u5bf9\u6bd4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u7075\u6d3b\u6027\uff1a<\/strong>\u52a8\u6001\u4ee3\u7406\u66f4\u52a0\u7075\u6d3b\uff0c\u4e0d\u9700\u8981\u5fc5\u987b\u5b9e\u73b0\u63a5\u53e3\uff0c\u53ef\u4ee5\u76f4\u63a5\u4ee3\u7406\u5b9e\u73b0\u7c7b\uff0c\u5e76\u4e14\u53ef\u4ee5\u4e0d\u9700\u8981\u9488\u5bf9\u6bcf\u4e2a\u76ee\u6807\u7c7b\u90fd\u521b\u5efa\u4e00\u4e2a\u4ee3\u7406\u7c7b\u3002\u53e6\u5916\uff0c\u9759\u6001\u4ee3\u7406\u4e2d\uff0c\u63a5\u53e3\u4e00\u65e6\u65b0\u589e\u52a0\u65b9\u6cd5\uff0c\u76ee\u6807\u5bf9\u8c61\u548c\u4ee3\u7406\u5bf9\u8c61\u90fd\u8981\u8fdb\u884c\u4fee\u6539\uff0c\u8fd9\u662f\u975e\u5e38\u9ebb\u70e6\u7684\uff01<br \/>\n<strong>JVM \u5c42\u9762<\/strong>\uff1a\u9759\u6001\u4ee3\u7406\u5728\u7f16\u8bd1\u65f6\u5c31\u5c06\u63a5\u53e3\u3001\u5b9e\u73b0\u7c7b\u3001\u4ee3\u7406\u7c7b\u8fd9\u4e9b\u90fd\u53d8\u6210\u4e86\u4e00\u4e2a\u4e2a\u5b9e\u9645\u7684 class \u6587\u4ef6\u3002\u800c\u52a8\u6001\u4ee3\u7406\u662f\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7c7b\u5b57\u8282\u7801\uff0c\u5e76\u52a0\u8f7d\u5230 JVM \u4e2d\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u503c\u4f20\u9012\u8be6\u89e3 \u5f62\u53c2&amp;\u5b9e\u53c2 \u65b9\u6cd5\u7684\u5b9a\u4e49\u53ef\u80fd\u4f1a\u7528\u5230 \u53c2\u6570\uff08\u6709\u53c2\u7684\u65b9\u6cd5\uff09\uff0c\u53c2\u6570\u5728\u7a0b\u5e8f\u8bed\u8a00\u4e2d\u5206\u4e3a\uff1a \u5b9e\u53c2\uff08\u5b9e\u9645\u53c2\u6570\uff0cArguments\uff09\uff1a\u7528\u4e8e\u4f20\u9012\u7ed9\u51fd\u6570\/\u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u5fc5\u987b\u6709\u786e\u5b9a\u7684\u503c\u3002 \u5f62\u53c2\uff08\u5f62\u5f0f\u53c2\u6570\uff0cParameters\uff09\uff1a\u7528\u4e8e\u5b9a\u4e49\u51fd\u6570\/\u65b9\u6cd5\uff0c\u63a5\u6536\u5b9e\u53c2\uff0c\u4e0d\u9700\u8981\u6709\u786e\u5b9a\u7684\u503c\u3002 String hello = &quot;Hello!&quot;; \/\/ hello \u4e3a\u5b9e\u53c2 sayHello(he [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":135,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-132","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/132","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/comments?post=132"}],"version-history":[{"count":3,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/132\/revisions"}],"predecessor-version":[{"id":136,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/132\/revisions\/136"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/media\/135"}],"wp:attachment":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/media?parent=132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/categories?post=132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/tags?post=132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}