JDK1.8之设计模式--动态代理

咳咳，周末嘛，给大家手搓一个动态代理来，用的是jdk1.8的反射包下的invocationHandler和Proxy哈  ，开搓。。。

• 定义一个接口

package org.ssm.king.service;

public interface Person {

    void findLove();

    void zufangzi();

    void buy();

    void findJob();
}

• 搞个实现类，此类为被代理类

package org.ssm.king.service;

public class ASanGe implements Person {
    @Override
    public void findLove() {

    }

    @Override
    public void zufangzi() {

    }

    @Override
    public void buy() {
        System.out.println("a san ge want to buy a elephant");
    }

    @Override
    public void findJob() {

    }
}

• 搞个代理类

package org.ssm.king.service;

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

public class Agent implements InvocationHandler {

    private Object target;

    public Object getInstance(Object target) {
        this.target = target;
        Class clazz = target.getClass();

        return Proxy.newProxyInstance(clazz.getClassLoader(), clazz.getInterfaces(), this);
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("我是代理商，我可以帮你做一些事情");
        method.invoke(this.target, args);
        return null;
    }
}

• 好啦 让我们来实验下代理类能不能代理被代理类的东东

package org.ssm.king.service;

public class JDKProxyTest {
    public static void main(String[] args) {

        Person aSanGe = (Person) new Agent().getInstance(new ASanGe());

        aSanGe.buy();
    }
}

• Run And 看一下执行结果：