动态代理与静态代理

动态代理与静态代理

静态代理例程如下：

package com.atscnu;
interface ClothFactory{
    void produce();
}
class NikeClothFactory implements ClothFactory{

    @Override
    public void produce() {
        System.out.println("Nike 生成鞋子");
    }
}
class StaticProxy implements ClothFactory{
    ClothFactory clothFactory;
    public StaticProxy(ClothFactory clothFactory){
        this.clothFactory = clothFactory;
    }
    @Override
    public void produce() {
        System.out.println("代理类开始进行代理！！");
        clothFactory.produce();
    }
}
public class TestStaticProxy {
    public static void main(String[] args) {
        NikeClothFactory nikeClothFactory = new NikeClothFactory();
        StaticProxy staticProxy = new StaticProxy(nikeClothFactory);
        staticProxy.produce();
    }
}

动态代理例程：

package com.atscnu;

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

interface Subject{
    void info();
}
class RealSubject implements Subject{  //被代理类实现接口
    @Override
    public void info() {
        System.out.println("我是被代理类，我要被执行！！！");
    }
}
//代理类实现InvocationHandler接口
class MyProxyHandle implements InvocationHandler{
    Object object;
//    1. 对被代理类实例化；2. 返回一个代理类对象
    public Object realProxy(Object object){
        this.object = object;
        return Proxy.newProxyInstance(object.getClass().getClassLoader(), object.getClass().getInterfaces(),this);
    }
//    当通过代理类对重写的方法进行调用的时候，都会调用下面这个方法
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        Object invoke = method.invoke(object, args);
        return invoke;
    }
}
public class TestDynamicProxy {
    public static void main(String[] args) {
//        创建一个被代理类对象
        RealSubject realSubject = new RealSubject();
//        创建一个实现InnovationHandler接口的对象
        MyProxyHandle myProxyHandle = new MyProxyHandle();
//        调用realProxy方法，返回一个同样实现了Subject接口的对象，即代理类的对象，此时o为代理类对象
        Object o = myProxyHandle.realProxy(realSubject);
        Subject myProxyHandle1 = (Subject)o;
//        转到对invoke方法的调用
        myProxyHandle1.info();


//        例子2
        NikeClothFactory nikeClothFactory = new NikeClothFactory();
        MyProxyHandle myProxyHandle2 = new MyProxyHandle();
        ClothFactory  clothFactory = (ClothFactory)myProxyHandle2.realProxy(nikeClothFactory);
        clothFactory.produce();
    }
}