## 動態代理實現 > `JDK代理` 實現`InvocationHandler`接口并實現`invoke(Object proxy, Method method, Object[] args)`方法 ep: ~~~ public class StudentInvocation<T> implements InvocationHandler{ ? private T t; public StudentInvocation(T t) { this.t = t; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws ? ? ? ? Throwable { System.out.println("-----方法執行前----"); System.out.println("方法名："+method.getName()); Object result = method.invoke(t, args); System.out.println("結果："+ result); System.out.println("-----方法執行后----"); return result; } ? ? ?/** * 創建代理類 * @return */ public T createProxy() { return (T) Proxy.newProxyInstance(t.getClass().getClassLoader(), t.getClass().getInterfaces(), this); } } ~~~ > `CJLB代理` 實現`MethodInterceptor`并實現方法`intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy arg3)`方法 ep: ~~~ public class CglbProxy implements MethodInterceptor { ? @Override public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy arg3) throws Throwable { ?System.out.println("cglb執行前"); // Object invokeSuper = arg3.invoke(arg0, arg2); ?Object invokeSuper = arg3.invokeSuper(arg0, arg2); ?System.out.println("cglb執行后"); ?return invokeSuper; } /** * 創建代理類 * @param clazz * @return */ public Object createProxy(Class clazz) { Enhancer enhancer = new Enhancer(); enhancer.setSuperclass(clazz); enhancer.setCallback(this); return enhancer.create(); } ? } ~~~ **tip：注解的實現** 注解的實現也是用了代理類，其中會將在注解中設置的屬性放入其實現代理類的`memberValues`字段中。