{"id":39893,"date":"2023-12-11T14:49:09","date_gmt":"2023-12-11T06:49:09","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=39893"},"modified":"2023-12-11T14:49:09","modified_gmt":"2023-12-11T06:49:09","slug":"java%e5%8f%8d%e5%b0%84%e5%92%8c%e5%8a%a8%e6%80%81%e4%bb%a3%e7%90%86%e7%9a%84%e5%8c%ba%e5%88%ab%ef%bc%88jdk-proxy%e5%92%8ccglib%ef%bc%89","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/java%e5%8f%8d%e5%b0%84%e5%92%8c%e5%8a%a8%e6%80%81%e4%bb%a3%e7%90%86%e7%9a%84%e5%8c%ba%e5%88%ab%ef%bc%88jdk-proxy%e5%92%8ccglib%ef%bc%89\/","title":{"rendered":"Java\u53cd\u5c04\u548c\u52a8\u6001\u4ee3\u7406\u7684\u533a\u522b\uff08JDK Proxy\u548cCglib\uff09"},"content":{"rendered":"<p>&#8220;`&#8221;                    \u53cd\u5c04\u548c\u52a8\u6001\u4ee3\u7406\u653e\u6709\u4e00\u5b9a\u7684\u76f8\u5173\u6027\uff0c\u4f46\u5355\u7eaf\u7684\u8bf4\u52a8\u6001\u4ee3\u7406\u662f\u7531\u53cd\u5c04\u673a\u5236\u5b9e\u73b0\u7684\uff0c\u5176\u5b9e\u662f\u4e0d\u591f\u5168\u9762\u4e0d\u51c6\u786e\u7684\uff0c\u52a8\u6001\u4ee3\u7406\u662f\u4e00\u79cd\u529f\u80fd\u884c\u4e3a\uff0c\u800c\u5b83\u7684\u5b9e\u73b0\u65b9\u6cd5\u6709\u5f88\u591a\u3002\u8981\u600e\u4e48\u7406\u89e3\u4ee5\u4e0a\u8fd9\u53e5\u8bdd\uff0c\u8bf7\u770b\u4e0b\u6587\u3002<\/p>\n<h1 data-breakpage=\"\"\"\">\u4e00\u3001\u53cd\u5c04<\/h1>\n<p>\u53cd\u5c04\u673a\u5236\u662f Java \u8bed\u8a00\u63d0\u4f9b\u7684\u4e00\u79cd\u57fa\u7840\u529f\u80fd\uff0c\u8d4b\u4e88\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6<strong>\u81ea\u7701<\/strong>\uff08introspect\uff0c\u5b98\u65b9\u7528\u8bed\uff09\u7684\u80fd\u529b\u3002\u901a\u8fc7\u53cd\u5c04\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u7c7b\u6216\u8005\u5bf9\u8c61\uff0c\u6bd4\u5982\u83b7\u53d6\u67d0\u4e2a\u5bf9\u8c61\u7684\u7c7b\u5b9a\u4e49\uff0c\u83b7\u53d6\u7c7b\u58f0\u660e\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u8c03\u7528\u65b9\u6cd5\u6216\u8005\u6784\u9020\u5bf9\u8c61\uff0c\u751a\u81f3\u53ef\u4ee5\u8fd0\u884c\u65f6\u4fee\u6539\u7c7b\u5b9a\u4e49\u3002<\/p>\n<h2>1\u3001\u83b7\u53d6\u7c7b\uff08Class\uff09\u5bf9\u8c61<\/h2>\n<p>\u83b7\u53d6\u7c7b\u5bf9\u8c61\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7forName() -&gt; \u793a\u4f8b\uff1aClass.forName(&#8220;&#8221;PeopleImpl&#8221;&#8221;)<\/li>\n<li>\u901a\u8fc7getClass() -&gt; \u793a\u4f8b\uff1anew PeopleImpl().getClass()<\/li>\n<li>\u76f4\u63a5\u83b7\u53d6.class -&gt; \u793a\u4f8b\uff1aPeopleImpl.class<\/li>\n<\/ul>\n<h2>2\u3001\u7c7b\u7684\u5e38\u7528\u65b9\u6cd5<\/h2>\n<ul>\n<li>getName()\uff1a\u83b7\u53d6\u7c7b\u5b8c\u6574\u65b9\u6cd5\uff1b<\/li>\n<li>getSuperclass()\uff1a\u83b7\u53d6\u7c7b\u7684\u7236\u7c7b\uff1b<\/li>\n<li>newInstance()\uff1a\u521b\u5efa\u5b9e\u4f8b\u5bf9\u8c61\uff1b<\/li>\n<li>getFields()\uff1a\u83b7\u53d6\u5f53\u524d\u7c7b\u548c\u7236\u7c7b\u7684public\u4fee\u9970\u7684\u6240\u6709\u5c5e\u6027\uff1b<\/li>\n<li>getDeclaredFields()\uff1a\u83b7\u53d6\u5f53\u524d\u7c7b\uff08\u4e0d\u5305\u542b\u7236\u7c7b\uff09\u7684\u58f0\u660e\u7684\u6240\u6709\u5c5e\u6027\uff1b<\/li>\n<li>getMethod()\uff1a\u83b7\u53d6\u5f53\u524d\u7c7b\u548c\u7236\u7c7b\u7684public\u4fee\u9970\u7684\u6240\u6709\u65b9\u6cd5\uff1b<\/li>\n<li>getDeclaredMethods()\uff1a\u83b7\u53d6\u5f53\u524d\u7c7b\uff08\u4e0d\u5305\u542b\u7236\u7c7b\uff09\u7684\u58f0\u660e\u7684\u6240\u6709\u65b9\u6cd5\uff1b<\/li>\n<\/ul>\n<p>\u66f4\u591a\u65b9\u6cd5\uff1a<a href=\"\"http:\/\/icdn.apigo.cn\/blog\/class-all-method.png\"\" target=\"\"_blank\"\" class=\"\"url\"\">http:\/\/icdn.apigo.cn\/blog\/class-all-method.png<\/a><\/p>\n<h2>3\u3001\u7c7b\u65b9\u6cd5\u8c03\u7528<\/h2>\n<p>\u53cd\u5c04\u8981\u8c03\u7528\u7c7b\u4e2d\u7684\u65b9\u6cd5\uff0c\u9700\u8981\u901a\u8fc7\u5173\u952e\u65b9\u6cd5\u201cinvoke()\u201d\u5b9e\u73b0\u7684\uff0c\u65b9\u6cd5\u8c03\u7528\u4e5f\u5206\u4e3a\u4e09\u79cd\uff1a<\/p>\n<ul>\n<li>\u9759\u6001\uff08static\uff09\u65b9\u6cd5\u8c03\u7528<\/li>\n<li>\u666e\u901a\u65b9\u6cd5\u8c03\u7528<\/li>\n<li>\u79c1\u6709\u65b9\u6cd5\u8c03\u7528<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u4f1a\u5206\u522b\u6f14\u793a\uff0c\u5404\u79cd\u8c03\u7528\u7684\u5b9e\u73b0\u4ee3\u7801\uff0c\u5404\u79cd\u8c03\u7528\u7684\u516c\u5171\u4ee3\u7801\u90e8\u5206\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code>\/\/ \u6b64\u6bb5\u4ee3\u7801\u4e3a\u516c\u5171\u4ee3\u7801interface People {    int parentAge = 18;    public void sayHi(String name);}class PeopleImpl implements People {    private String privSex = \"\"\u7537\"\";    public String race = \"\"\u6c49\u65cf\"\";    @Override    public void sayHi(String name) {        System.out.println(\"\"hello,\"\" + name);    }    private void prvSayHi() {        System.out.println(\"\"prvSayHi~\"\");    }    public static void getSex() {        System.out.println(\"\"18\u5c81\"\");    }}<\/code><\/pre>\n<h3>3.1 \u9759\u6001\u65b9\u6cd5\u8c03\u7528<\/h3>\n<pre><code>\/\/ \u6838\u5fc3\u4ee3\u7801\uff08\u7701\u7565\u4e86\u629b\u51fa\u5f02\u5e38\u7684\u58f0\u660e\uff09public static void main(String[] args) {    Class myClass = Class.forName(\"\"example.PeopleImpl\"\");    \/\/ \u8c03\u7528\u9759\u6001\uff08static\uff09\u65b9\u6cd5    Method getSex = myClass.getMethod(\"\"getSex\"\");    getSex.invoke(myClass);}<\/code><\/pre>\n<p>\u9759\u6001\u65b9\u6cd5\u7684\u8c03\u7528\u6bd4\u8f83\u7b80\u5355\uff0c\u4f7f\u7528 getMethod(xx) \u83b7\u53d6\u5230\u5bf9\u5e94\u7684\u65b9\u6cd5\uff0c\u76f4\u63a5\u4f7f\u7528 invoke(xx)\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<h3>3.2 \u666e\u901a\u65b9\u6cd5\u8c03\u7528<\/h3>\n<p>\u666e\u901a\u975e\u9759\u6001\u65b9\u6cd5\u8c03\u7528\uff0c\u9700\u8981\u5148\u83b7\u53d6\u7c7b\u793a\u4f8b\uff0c\u901a\u8fc7\u201cnewInstance()\u201d\u65b9\u6cd5\u83b7\u53d6\uff0c\u6838\u5fc3\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>Class myClass = Class.forName(\"\"example.PeopleImpl\"\");Object object = myClass.newInstance();Method method = myClass.getMethod(\"\"sayHi\"\",String.class);method.invoke(object,\"\"\u8001\u738b\"\");<\/code><\/pre>\n<p>getMethod \u83b7\u53d6\u65b9\u6cd5\uff0c\u53ef\u4ee5\u58f0\u660e\u9700\u8981\u4f20\u9012\u7684\u53c2\u6570\u7684\u7c7b\u578b\u3002<\/p>\n<h3>3.3 \u8c03\u7528\u79c1\u6709\u65b9\u6cd5<\/h3>\n<p>\u8c03\u7528\u79c1\u6709\u65b9\u6cd5\uff0c\u5fc5\u987b\u4f7f\u7528\u201cgetDeclaredMethod(xx)\u201d\u83b7\u53d6\u672c\u7c7b\u6240\u6709\u4ec0\u4e48\u7684\u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>Class myClass = Class.forName(\"\"example.PeopleImpl\"\");Object object = myClass.newInstance();Method privSayHi = myClass.getDeclaredMethod(\"\"privSayHi\"\");privSayHi.setAccessible(true); \/\/ \u4fee\u6539\u8bbf\u95ee\u9650\u5236privSayHi.invoke(object);<\/code><\/pre>\n<p>\u9664\u4e86\u201cgetDeclaredMethod(xx)\u201d\u53ef\u4ee5\u770b\u51fa\uff0c\u8c03\u7528\u79c1\u6709\u65b9\u6cd5\u7684\u5173\u952e\u662f\u8bbe\u7f6e setAccessible(true) \u5c5e\u6027\uff0c\u4fee\u6539\u8bbf\u95ee\u9650\u5236\uff0c\u8fd9\u6837\u8bbe\u7f6e\u4e4b\u540e\u5c31\u53ef\u4ee5\u8fdb\u884c\u8c03\u7528\u4e86\u3002<\/p>\n<h2>4\u3001\u603b\u7ed3<\/h2>\n<p>1.\u5728\u53cd\u5c04\u4e2d\u6838\u5fc3\u7684\u65b9\u6cd5\u662f newInstance() \u83b7\u53d6\u7c7b\u5b9e\u4f8b\uff0cgetMethod(..) \u83b7\u53d6\u65b9\u6cd5\uff0c\u4f7f\u7528 invoke(..) \u8fdb\u884c\u65b9\u6cd5\u8c03\u7528\uff0c\u901a\u8fc7 setAccessible \u4fee\u6539\u79c1\u6709\u53d8\u91cf\/\u65b9\u6cd5\u7684\u8bbf\u95ee\u9650\u5236\u3002<\/p>\n<p>2.\u83b7\u53d6\u5c5e\u6027\/\u65b9\u6cd5\u7684\u65f6\u5019\u6709\u65e0\u201cDeclared\u201d\u7684\u533a\u522b\u662f\uff0c\u5e26\u6709 Declared \u4fee\u9970\u7684\u65b9\u6cd5\u6216\u5c5e\u6027\uff0c\u53ef\u4ee5\u83b7\u53d6\u672c\u7c7b\u7684\u6240\u6709\u65b9\u6cd5\u6216\u5c5e\u6027\uff08private \u5230 public\uff09\uff0c\u4f46\u4e0d\u80fd\u83b7\u53d6\u5230\u7236\u7c7b\u7684\u4efb\u4f55\u4fe1\u606f\uff1b\u975e Declared \u4fee\u9970\u7684\u65b9\u6cd5\u6216\u5c5e\u6027\uff0c\u53ea\u80fd\u83b7\u53d6 public \u4fee\u9970\u7684\u65b9\u6cd5\u6216\u5c5e\u6027\uff0c\u5e76\u53ef\u4ee5\u83b7\u53d6\u5230\u7236\u7c7b\u7684\u4fe1\u606f\uff0c\u6bd4\u5982 getMethod(..)\u548cgetDeclaredMethod(..)\u3002<\/p>\n<h1 data-breakpage=\"\"\"\">\u4e8c\u3001\u52a8\u6001\u4ee3\u7406<\/h1>\n<p>\u52a8\u6001\u4ee3\u7406\u662f\u4e00\u79cd\u65b9\u4fbf\u8fd0\u884c\u65f6\u52a8\u6001\u6784\u5efa\u4ee3\u7406\u3001\u52a8\u6001\u5904\u7406\u4ee3\u7406\u65b9\u6cd5\u8c03\u7528\u7684\u673a\u5236\uff0c\u5f88\u591a\u573a\u666f\u90fd\u662f\u5229\u7528\u7c7b\u4f3c\u673a\u5236\u505a\u5230\u7684\uff0c\u6bd4\u5982\u7528\u6765\u5305\u88c5 RPC \u8c03\u7528\u3001\u9762\u5411\u5207\u9762\u7684\u7f16\u7a0b\uff08AOP\uff09\u3002<\/p>\n<p>\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406\u7684\u65b9\u5f0f\u5f88\u591a\uff0c\u6bd4\u5982 JDK \u81ea\u8eab\u63d0\u4f9b\u7684\u52a8\u6001\u4ee3\u7406\uff0c\u5c31\u662f\u4e3b\u8981\u5229\u7528\u4e86\u4e0a\u9762\u63d0\u5230\u7684\u53cd\u5c04\u673a\u5236\u3002\u8fd8\u6709\u5176\u4ed6\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u6bd4\u5982\u5229\u7528\u4f20\u8bf4\u4e2d\u66f4\u9ad8\u6027\u80fd\u7684\u5b57\u8282\u7801\u64cd\u4f5c\u673a\u5236\uff0c\u7c7b\u4f3c ASM\u3001cglib\uff08\u57fa\u4e8e ASM\uff09\u7b49\u3002<\/p>\n<p><strong>\u52a8\u6001\u4ee3\u7406\u89e3\u51b3\u7684\u95ee\u9898\uff1f<\/strong><\/p>\n<p>\u9996\u5148\uff0c\u5b83\u662f\u4e00\u4e2a<strong>\u4ee3\u7406\u673a\u5236<\/strong>\u3002\u5982\u679c\u719f\u6089\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u7684\u4ee3\u7406\u6a21\u5f0f\uff0c\u6211\u4eec\u4f1a\u77e5\u9053\uff0c\u4ee3\u7406\u53ef\u4ee5\u770b\u4f5c\u662f\u5bf9\u8c03\u7528\u76ee\u6807\u7684\u4e00\u4e2a\u5305\u88c5\uff0c\u8fd9\u6837\u6211\u4eec\u5bf9\u76ee\u6807\u4ee3\u7801\u7684\u8c03\u7528\u4e0d\u662f\u76f4\u63a5\u53d1\u751f\u7684\uff0c\u800c\u662f\u901a\u8fc7\u4ee3\u7406\u5b8c\u6210\u3002\u901a\u8fc7\u4ee3\u7406\u53ef\u4ee5\u8ba9\u8c03\u7528\u8005\u4e0e\u5b9e\u73b0\u8005\u4e4b\u95f4<strong>\u89e3\u8026<\/strong>\u3002\u6bd4\u5982\u8fdb\u884c RPC \u8c03\u7528\uff0c\u901a\u8fc7\u4ee3\u7406\uff0c\u53ef\u4ee5\u63d0\u4f9b\u66f4\u52a0\u53cb\u5584\u7684\u754c\u9762\u3002\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4ee3\u7406\uff0c\u53ef\u4ee5\u505a\u4e00\u4e2a\u5168\u5c40\u7684\u62e6\u622a\u5668\u3002<\/p>\n<h2>1\u3001JDK Proxy \u52a8\u6001\u4ee3\u7406<\/h2>\n<p>JDK Proxy \u662f\u901a\u8fc7\u5b9e\u73b0 InvocationHandler \u63a5\u53e3\u6765\u5b9e\u73b0\u7684\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>interface Animal {    void eat();}class Dog implements Animal {    @Override    public void eat() {        System.out.println(\"\"The dog is eating\"\");    }}class Cat implements Animal {    @Override    public void eat() {        System.out.println(\"\"The cat is eating\"\");    }}\/\/ JDK \u4ee3\u7406\u7c7bclass AnimalProxy implements InvocationHandler {    private Object target; \/\/ \u4ee3\u7406\u5bf9\u8c61    public Object getInstance(Object target) {        this.target = target;        \/\/ \u53d6\u5f97\u4ee3\u7406\u5bf9\u8c61        return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);    }    @Override    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {        System.out.println(\"\"\u8c03\u7528\u524d\"\");        Object result = method.invoke(target, args); \/\/ \u65b9\u6cd5\u8c03\u7528        System.out.println(\"\"\u8c03\u7528\u540e\"\");        return result;    }}public static void main(String[] args) {    \/\/ JDK \u52a8\u6001\u4ee3\u7406\u8c03\u7528    AnimalProxy proxy = new AnimalProxy();    Animal dogProxy = (Animal) proxy.getInstance(new Dog());    dogProxy.eat();}<\/code><\/pre>\n<p>\u5982\u4e0a\u4ee3\u7801\uff0c\u6211\u4eec\u5b9e\u73b0\u4e86\u901a\u8fc7\u52a8\u6001\u4ee3\u7406\uff0c\u5728\u6240\u6709\u8bf7\u6c42\u4e4b\u524d\u548c\u4e4b\u540e\u6253\u5370\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u4fe1\u606f\u3002<\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong> JDK Proxy \u53ea\u80fd\u4ee3\u7406\u5b9e\u73b0\u63a5\u53e3\u7684\u7c7b\uff08\u5373\u4f7f\u662fextends\u7ee7\u627f\u7c7b\u4e5f\u662f\u4e0d\u53ef\u4ee5\u4ee3\u7406\u7684\uff09\u3002<\/p>\n<p><strong>JDK Proxy \u4e3a\u4ec0\u4e48\u53ea\u80fd\u4ee3\u7406\u5b9e\u73b0\u63a5\u53e3\u7684\u7c7b\uff1f<\/strong><\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u8981\u4ece\u52a8\u6001\u4ee3\u7406\u7684\u5b9e\u73b0\u65b9\u6cd5 newProxyInstance \u6e90\u7801\u8bf4\u8d77\uff1a<\/p>\n<pre><code>@CallerSensitivepublic static Object newProxyInstance(ClassLoader loader,                                      Class<?>[] interfaces,                                      InvocationHandler h)    throws IllegalArgumentException{\/\/ \u7701\u7565\u5176\u4ed6\u4ee3\u7801<\/code><\/pre>\n<p>\u6765\u770b\u524d\u4e24\u4e2a\u6e90\u7801\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n<pre><code>* @param   loader the class loader to define the proxy class* @param   interfaces the list of interfaces for the proxy class to implement<\/code><\/pre>\n<ul>\n<li>loader\uff1a\u4e3a\u7c7b\u52a0\u8f7d\u5668\uff0c\u4e5f\u5c31\u662f target.getClass().getClassLoader()<\/li>\n<li>interfaces\uff1a\u63a5\u53e3\u4ee3\u7406\u7c7b\u7684\u63a5\u53e3\u5b9e\u73b0\u5217\u8868<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u8fd9\u4e2a\u95ee\u9898\u7684\u6e90\u5934\uff0c\u5728\u4e8e JDK Proxy \u7684\u6e90\u7801\u8bbe\u8ba1\u3002\u5982\u679c\u8981\u6267\u610f\u52a8\u6001\u4ee3\u7406\uff0c\u975e\u63a5\u53e3\u5b9e\u73b0\u7c7b\u5c31\u4f1a\u62a5\u9519\uff1a<\/p>\n<blockquote><p>Exception in thread &#8220;&#8221;main&#8221;&#8221; java.lang.ClassCastException: com.sun.proxy.$Proxy0 cannot be cast to xxx<\/p>\n<\/blockquote>\n<h2>2\u3001Cglib \u52a8\u6001\u4ee3\u7406<\/h2>\n<p>JDK \u52a8\u6001\u4ee3\u7406\u673a\u5236\u53ea\u80fd\u4ee3\u7406\u5b9e\u73b0\u4e86\u63a5\u53e3\u7684\u7c7b\uff0cCglib \u662f\u9488\u5bf9\u7c7b\u6765\u5b9e\u73b0\u4ee3\u7406\u7684\uff0c\u4ed6\u7684\u539f\u7406\u662f\u5bf9\u6307\u5b9a\u7684\u76ee\u6807\u7c7b\u751f\u6210\u4e00\u4e2a\u5b50\u7c7b\uff0c\u5e76\u8986\u76d6\u5176\u4e2d\u65b9\u6cd5\u5b9e\u73b0\u589e\u5f3a\uff0c\u4f46\u56e0\u4e3a\u91c7\u7528\u7684\u662f\u7ee7\u627f\uff0c\u6240\u4ee5\u4e0d\u80fd\u5bf9 final \u4fee\u9970\u7684\u7c7b\u8fdb\u884c\u4ee3\u7406\u3002<\/p>\n<p>Cglib \u53ef\u4ee5\u901a\u8fc7 Maven \u76f4\u63a5\u8fdb\u884c\u7248\u672c\u5f15\u7528\uff0cMaven \u7248\u672c\u5730\u5740\uff1a<a href=\"\"https:\/\/mvnrepository.com\/artifact\/cglib\/cglib\"\" target=\"\"_blank\"\" class=\"\"url\"\">https:\/\/mvnrepository.com\/artifact\/cglib\/cglib<\/a><\/p>\n<p>\u672c\u6587\u4f7f\u7528\u7684\u662f\u6700\u65b0\u7248\u672c 3.2.9 \u7684 Cglib\uff0c\u5728 pom.xml \u6dfb\u52a0\u5982\u4e0b\u5f15\u7528\uff1a<\/p>\n<pre><code><dependency>    <groupId>cglib<\/groupId>    <artifactId>cglib<\/artifactId>    <version>3.2.9<\/version><\/dependency><\/code><\/pre>\n<p>Cglib \u4ee3\u7801\u5b9e\u73b0\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code>class Panda {    public void eat() {        System.out.println(\"\"The panda is eating\"\");    }}class CglibProxy implements MethodInterceptor {    private Object target; \/\/ \u4ee3\u7406\u5bf9\u8c61    public Object getInstance(Object target) {        this.target = target;        Enhancer enhancer = new Enhancer();        \/\/ \u8bbe\u7f6e\u7236\u7c7b\u4e3a\u5b9e\u4f8b\u7c7b        enhancer.setSuperclass(this.target.getClass());        \/\/ \u56de\u8c03\u65b9\u6cd5        enhancer.setCallback(this);        \/\/ \u521b\u5efa\u4ee3\u7406\u5bf9\u8c61        return enhancer.create();    }    @Override    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {        System.out.println(\"\"\u8c03\u7528\u524d\"\");        Object result = methodProxy.invokeSuper(o, objects); \/\/ \u6267\u884c\u65b9\u6cd5\u8c03\u7528        System.out.println(\"\"\u8c03\u7528\u540e\"\");        return result;    }}public static void main(String[] args) {    \/\/ CGLIB \u52a8\u6001\u4ee3\u7406\u8c03\u7528    CglibProxy proxy = new CglibProxy();    Panda panda = (Panda)proxy.getInstance(new Panda());    panda.eat();}<\/code><\/pre>\n<p>cglib \u7684\u8c03\u7528\u901a\u8fc7\u5b9e\u73b0 MethodInterceptor \u63a5\u53e3\u7684 intercept \u65b9\u6cd5\uff0c\u8c03\u7528 invokeSuper \u8fdb\u884c\u52a8\u6001\u4ee3\u7406\u7684\uff0c\u53ef\u4ee5\u76f4\u63a5\u5bf9\u666e\u901a\u7c7b\u8fdb\u884c\u52a8\u6001\u4ee3\u7406\u3002<\/p>\n<h1 data-breakpage=\"\"\"\">\u4e09\u3001JDK Proxy VS Cglib<\/h1>\n<p><strong>JDK Proxy \u7684\u4f18\u52bf\uff1a<\/strong><\/p>\n<ul>\n<li>\u6700\u5c0f\u5316\u4f9d\u8d56\u5173\u7cfb\uff0c\u51cf\u5c11\u4f9d\u8d56\u610f\u5473\u7740\u7b80\u5316\u5f00\u53d1\u548c\u7ef4\u62a4\uff0cJDK \u672c\u8eab\u7684\u652f\u6301\uff0c\u66f4\u52a0\u53ef\u9760\uff1b<\/li>\n<li>\u5e73\u6ed1\u8fdb\u884c JDK \u7248\u672c\u5347\u7ea7\uff0c\u800c\u5b57\u8282\u7801\u7c7b\u5e93\u901a\u5e38\u9700\u8981\u8fdb\u884c\u66f4\u65b0\u4ee5\u4fdd\u8bc1\u5728\u65b0\u7248\u4e0a\u80fd\u591f\u4f7f\u7528\uff1b<\/li>\n<\/ul>\n<p><strong>Cglib \u6846\u67b6\u7684\u4f18\u52bf\uff1a<\/strong><\/p>\n<ul>\n<li>\u53ef\u8c03\u7528\u666e\u901a\u7c7b\uff0c\u4e0d\u9700\u8981\u5b9e\u73b0\u63a5\u53e3\uff1b<\/li>\n<li>\u9ad8\u6027\u80fd\uff1b<\/li>\n<\/ul>\n<p><strong>\u603b\u7ed3\uff1a<\/strong> \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6211\u4eec\u5728\u9009\u578b\u4e2d\uff0c\u6027\u80fd\u672a\u5fc5\u662f\u552f\u4e00\u8003\u91cf\uff0c\u53ef\u9760\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u3001\u7f16\u7a0b\u5de5\u4f5c\u91cf\u7b49\u5f80\u5f80\u662f\u66f4\u4e3b\u8981\u7684\u8003\u8651\u56e0\u7d20\uff0c\u6bd5\u7adf\u6807\u51c6\u7c7b\u5e93\u548c\u53cd\u5c04\u7f16\u7a0b\u7684\u95e8\u69db\u8981\u4f4e\u5f97\u591a\uff0c\u4ee3\u7801\u91cf\u4e5f\u662f\u66f4\u52a0\u53ef\u63a7\u7684\uff0c\u5982\u679c\u6211\u4eec\u6bd4\u8f83\u4e0b\u4e0d\u540c\u5f00\u6e90\u9879\u76ee\u5728\u52a8\u6001\u4ee3\u7406\u5f00\u53d1\u4e0a\u7684\u6295\u5165\uff0c\u4e5f\u80fd\u770b\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n<p>\u672c\u6587\u6240\u6709\u793a\u4f8b\u4ee3\u7801\uff1a<a href=\"\"https:\/\/github.com\/vipstone\/java-core-example.git\"\" target=\"\"_blank\"\" class=\"\"url\"\">https:\/\/github.com\/vipstone\/java-core-example.git<\/a><\/p>\n<pre><code>            \"```\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; 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