JAVA设计模式之动态代理（JDK）

以明星和经纪人为例子

package com.imust.proxy.dynamicProxy;

public interface Star {
    /**
     * 面谈
     */

    void confer();
    /**
     * 签合同
     */
    void signContract();
    /**
     * 订票
     */
    void bookTicket();
    /**
     * 唱歌
     */
    void sing();
    /**
     * 收钱
     */
    void collect();



}

package com.imust.proxy.dynamicProxy;

public class RealStar implements Star{

    @Override
    public void confer() {
        System.out.println("RealStar.confer()");
    }

    @Override
    public void signContract() {
        System.out.println("RealStar.signContract()");
    }

    @Override
    public void bookTicket() {
        System.out.println("RealStar.bookTicket()");
    }

    @Override
    public void sing() {
        System.out.println("RealStar(周杰伦).sing()");
    }

    @Override
    public void collect() {
        System.out.println("RealStar.collect()");
    }

}

package com.imust.proxy.dynamicProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class StarHandler implements InvocationHandler{

    Star realStar;
    public StarHandler(Star realStar){
        super();
        this.realStar = realStar;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        Object object = null;
        System.out.println("真正的方法执行前");
        System.out.println("预付款，电击器");

        //激活你调用的方法
        if(method.getName().equals("sing")){
            object = method.invoke(realStar, args);
        }
        return object;
    }

}

package com.imust.proxy.dynamicProxy;

import java.lang.reflect.Proxy;

public class Client {

    public static void main(String[] args) {
        Star realStar = new RealStar();

        StarHandler handler = new StarHandler(realStar);
        Star proxy = (Star) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[]{Star.class}, handler);

        proxy.sing();

    }

}