{"id":1990,"date":"2021-02-18T14:27:25","date_gmt":"2021-02-18T06:27:25","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=1990"},"modified":"2021-02-18T14:27:25","modified_gmt":"2021-02-18T06:27:25","slug":"proxy%e4%b8%8ecglib%e5%ae%9e%e7%8e%b0%e5%8a%a8%e6%80%81%e4%bb%a3%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/java\/2021\/02\/18\/1427251990.html","title":{"rendered":"Proxy\u4e0eCGLib\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406"},"content":{"rendered":"<h2>0\u3001\u9759\u6001\u4ee3\u7406<\/h2>\n<ul>\n<li>\u53c2\u8003\u94fe\u63a5\uff1a<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.yusian.com\/blog\/?p=1978\">https:\/\/www.yusian.com\/blog\/?p=1978<\/a><\/p>\n<\/li>\n<li>\n<p>\u7b80\u5355\u5730\u8bf4\uff1a\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u73b0\u4e86\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u529f\u80fd\uff0c\u6211\u4eec\u5c31\u5c06\u524d\u8005\u79f0\u4e3a\u540e\u8005\u7684\u4ee3\u7406\u3002\u7136\u800c\u5355\u7eaf\u5730\u5b9e\u73b0<strong>\u539f\u59cb\u5bf9\u8c61<\/strong>\u7684\u529f\u80fd\u6ca1\u6709\u592a\u5927\u7684\u610f\u4e49\uff0c\u4e00\u822c\u800c\u8a00\uff0c\u4ee3\u7406\u7684\u76ee\u7684\u662f\u5728\u539f\u59cb\u5bf9\u8c61\u529f\u80fd\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u989d\u5916\u7684\u6269\u5c55\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a<strong>\u9644\u52a0\u529f\u80fd<\/strong>\u3002<\/p>\n<\/li>\n<li>\n<p>\u9759\u6001\u4ee3\u7406\u5f88\u597d\u5730\u8be0\u91ca\u4e86\u4ee3\u7406\u7684\u4f5c\u7528\uff0c\u4f46\u7531\u4e8e\u9759\u6001\u4ee3\u7406\u7684\u7f3a\u9677\uff0c\u5229\u7528\u53cd\u5c04\u673a\u5236\u5bf9\u5176\u8fdb\u884c\u6539\u9020\u4fbf\u6709\u4e86\u52a8\u6001\u4ee3\u7406\u3002<\/p>\n<\/li>\n<li>\n<p>\u53ea\u8981\u662f\u4ee3\u7406\uff0c\u5176\u6838\u5fc3\u76ee\u7684\u90fd\u662f\u5728\u539f\u59cb\u5bf9\u8c61\u7684\u57fa\u7840\u4e0a\u6269\u5c55\u9644\u52a0\u529f\u80fd\uff0c\u8fd9\u4e00\u70b9\u59cb\u7ec8\u4e0d\u53d8\u3002<\/p>\n<\/li>\n<li>\u5e38\u7528\u7684\u52a8\u6001\u4ee3\u7406\u67092\u79cd\uff0c\u4e00\u79cdJDK\u81ea\u5e26\u7684Proxy\u7c7b\u53ca\u5bf9\u5176\u8fdb\u884c\u5c01\u88c5\u7684\u76f8\u5173\u7c7b\uff0c\u53e6\u4e00\u79cd\u662f\u4ee5CGLib\u4e3a\u4ee3\u8868\u7684\u7b2c\u4e09\u65b9\u5e93<\/li>\n<\/ul>\n<h2>1\u3001Proxy<\/h2>\n<h3>1.1\u3001\u57fa\u672c\u539f\u7406<\/h3>\n<ul>\n<li>Proxy\u57fa\u4e8e\u63a5\u53e3\uff0c\u52a8\u6001\u751f\u6210\u5b57\u8282\u7801\u6587\u4ef6\u7ed9JVM\uff0c\u5f97\u5230\u8be5\u63a5\u53e3\u53e6\u4e00\u4e2a\u5b9e\u73b0\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7531\u4e8e\u90fd\u662f\u5bf9\u4e00\u4e2a\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u5229\u7528\u591a\u6001\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u4ee3\u7406\u539f\u59cb\u5bf9\u8c61\u5b8c\u6210\u63a5\u53e3\u6240\u6709\u65b9\u6cd5\u7684\u8c03\u7528\u3002<\/li>\n<li>\u8c03\u7528\u8fc7\u7a0b\u4e2d\u901a\u8fc7\u5bf9\u6240\u6709\u65b9\u6cd5\u7684\u62e6\u622a\uff0c\u5b9e\u73b0\u9644\u52a0\u529f\u80fd\u7684\u6269\u5c55\uff1b<\/li>\n<li>\u8fd9\u4e2a\u62e6\u622a\u7684\u8fc7\u7a0b\u901a\u8fc7\u63a5\u53e3\u7684\u65b9\u5f0f\u5b9e\u73b0\uff1b<\/li>\n<\/ul>\n<h3>1.2\u3001\u4e24\u4e2a\u91cd\u8981\u7684\u65b9\u6cd5<\/h3>\n<ul>\n<li>\n<p>\u751f\u6210\u4ee3\u7406\u7c7b\u7684\u65b9\u6cd5\uff1a<\/p>\n<pre><code class=\"language-java line-numbers\">\/**\n* classLoader: \u751f\u6210\u5b57\u8282\u7801\u6587\u4ef6\u9700\u8981\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u7531\u4e8e\u8be5\u7c7b\u662f\u52a8\u6001\u751f\u6210\u7684\uff0c\u6ca1\u6709\u7c7b\u52a0\u8f7d\u5668\uff0c\u8fd9\u91cc\u53ef\u4ee5\u5199\u4efb\u610f\u4e00\u4e2a\u5b58\u5728\u7684\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\n* interfaces: \u539f\u59cb\u5bf9\u8c61\u7684\u63a5\u53e3\uff0c\u4ee3\u7406\u5bf9\u8c61\u9700\u8981\u5b9e\u73b0\u4e0e\u539f\u59cb\u76f8\u540c\u7684\u63a5\u53e3\n* invocationHandler: \u5b9e\u73b0\u62e6\u622a\u65b9\u6cd5\u7684\u5bf9\u8c61\n*\/\nProxy.newProxyInstance(classLoader, interfaces, invocationHandler)\n<\/code><\/pre>\n<\/li>\n<li>\u62e6\u622a\u65b9\u6cd5\n<pre><code class=\"language-java line-numbers\">\/**\n* \u539f\u59cb\u65b9\u6cd5\u5bf9\u5e94\u7684\u53c2\u6570\u5728\u8be5\u65b9\u6cd5\u4e2d\u901a\u8fc7\u53c2\u6570\u7684\u65b9\u5f0f\u4f20\u9012\u8fdb\u6765\uff0c\u5f53\u524d\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u5c06\u66ff\u4ee3\u539f\u59cb\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\n* \u53ef\u5728\u5f53\u524d\u65b9\u6cd5\u4e2d\u6267\u884c\u539f\u59cb\u65b9\u6cd5\uff0c\u5f97\u5230\u539f\u59cb\u65b9\u6cd5\u7684\u7ed3\u679c\uff0c\u4ece\u800c\u53c8\u53ef\u4ee5\u5728\u539f\u59cb\u65b9\u6cd5\u7684\u8c03\u7528\u524d\u540e\u8fdb\u884c\u9644\u52a0\u529f\u80fd\u6269\u5c55\n*\/\npublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {\n  return ret;\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>1.3\u3001\u793a\u4f8b\u8bf4\u660e<\/h3>\n<blockquote><p>\n  UserService\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">package com.yusian.service;\n\nimport com.yusian.domain.User;\n\npublic interface UserService {\n\n    void register(User user);\n\n    boolean login(String username, String password);\n\n}\n<\/code><\/pre>\n<blockquote><p>\n  UserServiceImpl\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">package com.yusian.service;\n\nimport com.yusian.domain.User;\n\npublic class UserServiceImpl implements UserService {\n    @Override\n    public void register(User user) {\n        System.out.println(\"UserServiceImpl.register--------\u539f\u59cb\u529f\u80fd\");\n    }\n\n    @Override\n    public boolean login(String username, String password) {\n        System.out.println(\"UserServiceImpl.login--------\u539f\u59cb\u529f\u80fd\");\n        return false;\n    }\n}\n<\/code><\/pre>\n<blockquote><p>\n  Proxy\u4ee3\u7406\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">UserService userService = new UserServiceImpl();\nUserService userServiceProxy = (UserService) Proxy.newProxyInstance(UserService.class.getClassLoader(), UserServiceImpl.class.getInterfaces(), new InvocationHandler() {\n    @Override\n    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {\n        System.out.println(\"before....\");\n        Object ret = method.invoke(userService, args);\n        System.out.println(\"after....\");\n        return ret;\n    }\n});\nuserServiceProxy.login(\"yusian\", \"123456\");\n<\/code><\/pre>\n<blockquote><p>\n  \u6267\u884c\u7ed3\u679c\uff1a\n<\/p><\/blockquote>\n<pre><code class=\"language-markdown line-numbers\">before...\nUserService.login\nafter...\n\nProcess finished with exit code 0\n<\/code><\/pre>\n<h2>2\u3001CGLib<\/h2>\n<h3>2.1\u3001\u57fa\u672c\u539f\u7406<\/h3>\n<ul>\n<li>\u5bf9\u6807Proxy\u901a\u8fc7\u5b9e\u73b0\u539f\u59cb\u4e2d\u5bf9\u8c61\u76f8\u540c\u7684\u63a5\u53e3\u6765\u83b7\u53d6\u76f8\u540c\u7684\u63a5\u53e3\u8c03\u7528\u80fd\u529b\uff0cCGLib\u901a\u8fc7\u7ee7\u627f\u539f\u59cb\u5bf9\u8c61\u7684\u7c7b\u83b7\u53d6\u76f8\u540c\u7684\u63a5\u53e3\u8c03\u7528\u80fd\u529b\u3002<\/li>\n<li>CGLib\u7684\u4f7f\u7528\u4e0eProxy\u9ad8\u5ea6\u7c7b\u4f3c\uff1b<\/li>\n<li>\u76f8\u5bf9Proxy\uff0c\u901a\u8fc7\u7ee7\u627f\u7684\u65b9\u5f0f\u6765\u4ee3\u7406\u539f\u59cb\u5bf9\u8c61\u66f4\u5177\u6709\u901a\u7528\u6027\uff1b<\/li>\n<\/ul>\n<h3>2.2\u3001\u51e0\u4e2a\u91cd\u8981\u7684\u65b9\u6cd5<\/h3>\n<ul>\n<li>\u521d\u59cb\u5316\u4e00\u4e2aEnhancer\u5de5\u5177\u7c7b\u7684\u5b9e\u4f8b\u5bf9\u8c61<\/p>\n<\/li>\n<li>\n<p>\u6307\u5b9a\u7c7b\u52a0\u8f7d\u5668\u65b9\u6cd5<code>setClassLoader<\/code>\uff0c\u4e0eProxy\u7c7b\u4f3c\uff1b<\/p>\n<\/li>\n<li>\n<p>\u6307\u5b9a\u7236\u7c7b<code>setSuperclass<\/code>\uff0c\u6307\u5b9a\u539f\u59cb\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u76f8\u5f53\u4e8eProxy\u7684interfaces\uff1b<\/p>\n<\/li>\n<li>\n<p>\u6307\u5b9a\u56de\u8c03<code>setCallback<\/code>\uff0c\u53c2\u6570\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u4e0eProxy\u7c7b\u4f3c\uff1b<\/p>\n<\/li>\n<li>\n<p>\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61<code>create<\/code>\uff0c\u751f\u6210\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\uff0c\u7c7b\u4f3cProxy\u7684newProxyInstance\uff1b<\/p>\n<\/li>\n<li>\n<p>\u62e6\u622a\u65b9\u6cd5<\/p>\n<pre><code class=\"language-java line-numbers\">public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {\n  return null;\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>2.3\u3001\u793a\u4f8b\u8bf4\u660e<\/h3>\n<blockquote><p>\n  UserService\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">package com.yusian.service;\n\npublic class UserService {\n\n    \/**\n     * \u767b\u5f55\n     * @param username \u7528\u6237\u540d\n     * @param password \u5bc6\u7801\n     *\/\n    public void login(String username, String password) {\n        System.out.println(\"UserService.login------\u539f\u59cb\u65b9\u6cd5\");\n    }\n}\n<\/code><\/pre>\n<blockquote><p>\n  CGLib\u4ee3\u7406\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">UserService userService = new UserService();\nEnhancer enhancer = new Enhancer();\nenhancer.setClassLoader(UserService.class.getClassLoader());\nenhancer.setSuperclass(UserService.class);\nenhancer.setCallback(new MethodInterceptor() {\n    @Override\n    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {\n        System.out.println(\"before...\");\n        Object ret = method.invoke(userService, objects);\n        System.out.println(\"after...\");\n        return ret;\n    }\n});\n\nUserService userServiceProxy = (UserService) enhancer.create();\nuserServiceProxy.login(\"yusian\", \"123456\");\n<\/code><\/pre>\n<blockquote><p>\n  \u6267\u884c\u7ed3\u679c\n<\/p><\/blockquote>\n<pre><code class=\"language-markdown line-numbers\">before...\nUserService.login------\u539f\u59cb\u65b9\u6cd5\nafter...\n\nProcess finished with exit code 0\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>0\u3001\u9759\u6001\u4ee3\u7406 \u53c2\u8003\u94fe\u63a5\uff1ahttps:\/\/www.yusian.com\/blog\/?p=1978 \u7b80\u5355\u5730\u8bf4\uff1a\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u73b0\u4e86\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u529f\u80fd\uff0c\u6211\u4eec\u5c31\u5c06\u524d\u8005\u79f0\u4e3a\u540e\u8005\u7684\u4ee3\u7406\u3002\u7136\u800c\u5355\u7eaf\u5730\u5b9e\u73b0\u539f\u59cb\u5bf9\u8c61\u7684\u529f\u80fd\u6ca1\u6709\u592a\u5927\u7684\u610f\u4e49\uff0c\u4e00\u822c\u800c\u8a00\uff0c\u4ee3\u7406\u7684\u76ee\u7684\u662f\u5728\u539f\u59cb\u5bf9\u8c61\u529f\u80fd\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u989d\u5916\u7684\u6269\u5c55\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u9644\u52a0\u529f\u80fd\u3002 \u9759\u6001\u4ee3\u7406\u5f88\u597d\u5730\u8be0\u91ca\u4e86\u4ee3\u7406\u7684\u4f5c\u7528\uff0c\u4f46\u7531\u4e8e\u9759\u6001\u4ee3\u7406\u7684\u7f3a\u9677\uff0c\u5229\u7528\u53cd\u5c04\u673a\u5236\u5bf9\u5176\u8fdb\u884c\u6539\u9020\u4fbf\u6709\u4e86\u52a8\u6001\u4ee3\u7406\u3002 \u53ea\u8981\u662f\u4ee3\u7406\uff0c\u5176\u6838\u5fc3\u76ee\u7684\u90fd\u662f\u5728\u539f\u59cb\u5bf9\u8c61\u7684\u57fa\u7840\u4e0a\u6269\u5c55\u9644\u52a0\u529f\u80fd\uff0c\u8fd9\u4e00\u70b9\u59cb\u7ec8\u4e0d\u53d8\u3002 \u5e38\u7528\u7684\u52a8\u6001\u4ee3\u7406\u67092\u79cd\uff0c\u4e00\u79cdJDK\u81ea\u5e26\u7684Proxy\u7c7b\u53ca\u5bf9\u5176\u8fdb\u884c\u5c01\u88c5\u7684\u76f8\u5173\u7c7b\uff0c\u53e6\u4e00\u79cd\u662f\u4ee5CGLib\u4e3a\u4ee3\u8868\u7684\u7b2c\u4e09\u65b9\u5e93 1\u3001Proxy 1.1\u3001\u57fa\u672c\u539f\u7406 Proxy\u57fa\u4e8e\u63a5\u53e3\uff0c\u52a8\u6001\u751f\u6210\u5b57\u8282\u7801\u6587\u4ef6\u7ed9JVM\uff0c\u5f97\u5230\u8be5\u63a5\u53e3\u53e6\u4e00\u4e2a\u5b9e\u73b0\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7531\u4e8e\u90fd\u662f\u5bf9\u4e00\u4e2a\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u5229\u7528\u591a\u6001\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u4ee3\u7406\u539f\u59cb\u5bf9\u8c61\u5b8c\u6210\u63a5\u53e3\u6240\u6709\u65b9\u6cd5\u7684\u8c03\u7528\u3002 \u8c03\u7528\u8fc7\u7a0b\u4e2d\u901a\u8fc7\u5bf9\u6240\u6709\u65b9\u6cd5\u7684\u62e6\u622a\uff0c\u5b9e\u73b0\u9644\u52a0\u529f\u80fd\u7684\u6269\u5c55\uff1b \u8fd9\u4e2a\u62e6\u622a\u7684\u8fc7\u7a0b\u901a\u8fc7\u63a5\u53e3\u7684\u65b9\u5f0f\u5b9e\u73b0\uff1b 1.2\u3001\u4e24\u4e2a\u91cd\u8981\u7684\u65b9\u6cd5 \u751f\u6210\u4ee3\u7406\u7c7b\u7684\u65b9\u6cd5\uff1a \/** * classLoader: \u751f\u6210\u5b57\u8282\u7801\u6587\u4ef6\u9700\u8981\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u7531\u4e8e\u8be5\u7c7b\u662f\u52a8\u6001\u751f\u6210\u7684\uff0c\u6ca1\u6709\u7c7b\u52a0\u8f7d\u5668\uff0c\u8fd9\u91cc\u53ef\u4ee5\u5199\u4efb\u610f\u4e00\u4e2a\u5b58\u5728\u7684\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668 * interfaces: \u539f\u59cb\u5bf9\u8c61\u7684\u63a5\u53e3\uff0c\u4ee3\u7406\u5bf9\u8c61\u9700\u8981\u5b9e\u73b0\u4e0e\u539f\u59cb\u76f8\u540c\u7684\u63a5\u53e3 * invocationHandler: \u5b9e\u73b0\u62e6\u622a\u65b9\u6cd5\u7684\u5bf9\u8c61 *\/ Proxy.newProxyInstance(classLoader, interfaces, invocationHandler) \u62e6\u622a\u65b9\u6cd5 \/** * \u539f\u59cb\u65b9\u6cd5\u5bf9\u5e94\u7684\u53c2\u6570\u5728\u8be5\u65b9\u6cd5\u4e2d\u901a\u8fc7\u53c2\u6570\u7684\u65b9\u5f0f\u4f20\u9012\u8fdb\u6765\uff0c\u5f53\u524d\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u5c06\u66ff\u4ee3\u539f\u59cb\u65b9\u6cd5\u7684\u8fd4\u56de\u503c * \u53ef\u5728\u5f53\u524d\u65b9\u6cd5\u4e2d\u6267\u884c\u539f\u59cb\u65b9\u6cd5\uff0c\u5f97\u5230\u539f\u59cb\u65b9\u6cd5\u7684\u7ed3\u679c\uff0c\u4ece\u800c\u53c8\u53ef\u4ee5\u5728\u539f\u59cb\u65b9\u6cd5\u7684\u8c03\u7528\u524d\u540e\u8fdb\u884c\u9644\u52a0\u529f\u80fd\u6269\u5c55 *\/ public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { return ret; } 1.3\u3001\u793a\u4f8b\u8bf4\u660e UserService package com.yusian.service; import com.yusian.domain.User; public 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