文章标题

动态代理

package com.ldu.reflect;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;interface Subject {    String action();}class RealSubject implements Subject {    @Override    public String action() {        System.out.println("我是代理类！！！！！！！！！！！！");        return "代理类";    }}class AopTest{    public void a1(){        System.out.println("i am a1");    }    public void a2(){        System.out.println("i am a2");    }}class myInvocationHandler implements InvocationHandler {    Object obj;    public Object blind(Object obj) {        this.obj = obj;        // 返回一个代理类的对象（被代理类的类加载器，被代理类实现的接口，调用此方法的对象）        return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj                .getClass().getInterfaces(), this);    }    @Override    public Object invoke(Object proxy, Method method, Object[] args)            throws Throwable {        AopTest at=new AopTest();        at.a1();        Object resultValue = method.invoke(obj, args);        at.a2();        return resultValue;    }}public class TestDongTai {    public static void main(String[] args) {        RealSubject rs=new RealSubject();        //创建一个实现了InvocationHandler接口的类的对象        myInvocationHandler mih=new myInvocationHandler();        Object obj=mih.blind(rs);        Subject sub=(Subject)obj;        String str=sub.action();        System.out.println(str);        System.out.println("------------------------------");        String str1=rs.action();        System.out.println(str1);    }}