动态代理（Dynamic Proxy）
代码例子：
package com.test;/** * 一个真实的接口 * @author yale * */public interface ISubject{public void request();}package com.test;/** * 一个真实的对象 * @author yale * */public class RealSubject implements ISubject{public void request(){System.out.println("real subject request");}}package com.test;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;/** * 一个动态代理对象，实现InvocationHandler * @author yale * */public class DynamicSubject implements InvocationHandler{ private Object obj;//被代理的对象public DynamicSubject(Object o){this.obj = o;}public Object invoke(Object proxy, Method method, Object[] args)throws Throwable{System.out.println("before request"); method.invoke(obj,args); System.out.println("after request");return null;}}package com.test;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Proxy;/** * 调用测试 * * @author yale * */public class Client{public static void main(String[] args){RealSubject realSubject = new RealSubject();InvocationHandler handler = new DynamicSubject(realSubject);Class<?> classType = handler.getClass();ISubject subject = (ISubject) Proxy.newProxyInstance(classType.getClassLoader(), realSubject.getClass().getInterfaces(),handler);subject.request();}}