package com.maggie.dynamicproxy;public interface IBuyWatermelon {//代理事件public abstract String buyWatermelon();public abstract void selectWatermelon();
}

package com.maggie.dynamicproxy;//可理解成被代理者
public class BuyWatermelonImpl implements IBuyWatermelon {private Supermarket supermaket;public BuyWatermelonImpl(Supermarket supermaket) {super();this.supermaket = supermaket;}@Overridepublic String buyWatermelon() {System.out.println("在"+supermaket.getName()+" 买西瓜");return "watermelon";}@Overridepublic void selectWatermelon() {System.out.println("选择无籽西瓜");}}

package com.maggie.dynamicproxy;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;public class ProxyFactory {//维护一个目标对象private Object target;public ProxyFactory(Object target){this.target=target;}//给目标对象生成代理对象public Object getProxyInstance(){//动态代理的核心，涉及到反射return Proxy.newProxyInstance(target.getClass().getClassLoader(),target.getClass().getInterfaces(),new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {//执行目标对象方法Object returnValue = method.invoke(target, args);return returnValue;}});}

}

package com.maggie.dynamicproxy;public class Main {public static void main(String[] args) {Supermarket zhaoLiu = new Supermarket();zhaoLiu.setName("赵六超市");IBuyWatermelon target  = new BuyWatermelonImpl(zhaoLiu);//被代理的对象//创建代理对象IBuyWatermelon hourskeeper = (IBuyWatermelon) new ProxyFactory(target).getProxyInstance();hourskeeper.buyWatermelon();hourskeeper.selectWatermelon();}
}

在赵六超市 买西瓜
选择无籽西瓜