记录java学习，动态代理

package com.atguigu.java;

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


interface Human {
    String getBelief();

    void eat(String food);
}

//被代理类
class SuperMan implements Human {

    @Override
    public String getBelief() {
        return "I believe I can fly!";
    }

    @Override
    public void eat(String food) {
        System.out.println("我喜欢吃" + food);
    }
}


//代理类
class ProxyFactory{
    //调用此方法，返回一个代理类的对象
    public static Object getProxyInstance(Object object){//被代理类的对象
        MyInvocationHandler handler = new MyInvocationHandler();
        handler.bind(object);
        return Proxy.newProxyInstance(object.getClass().getClassLoader(),
                object.getClass().getInterfaces(),handler);

    }
}

class MyInvocationHandler implements InvocationHandler{

    private Object object;//需要使用被代理类的对象进行赋值
    public void bind(Object object){
        this.object = object;
    }
    //当我们通过代理类的对象，调用方法a时，就会自动的调用如下的方法:invoke()
    //将被代理类要执行的方法a的功能就声明在invoke()中
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        //method:即为代理类对象调用的方法，此方法也就作为了被代理对象要调用的方法
        //obj:被代理类的对象
        Object returnValue = method.invoke(object, args);
        //上述方法的返回值就作为当前类中的invoke()的返回值
        return  returnValue;
    }
}

public class ProxyTest {
    public static void main(String[] args) {
        SuperMan superMan = new SuperMan();
        //proxyInstance:代理对象
        Human proxyInstance = (Human) ProxyFactory.getProxyInstance(superMan);
        String belief = proxyInstance.getBelief();
        System.out.println(belief);
        proxyInstance.eat("四川麻辣烫");
        System.out.println("**********");

        NikeClothFactory nike = new NikeClothFactory();
        ClothFactory proxyInstance1 = (ClothFactory) ProxyFactory.getProxyInstance(nike);
        proxyInstance1.produceCloth();


    }

}

package com.atguigu.java;



interface ClothFactory{
    void produceCloth();
}


//代理类
class  ProxyClothFactory implements ClothFactory{

    private ClothFactory factory;//用被代理类对象进行实例化

    public ProxyClothFactory(ClothFactory factory){
        this.factory = factory;
    }

    @Override
    public void produceCloth() {
        System.out.println("代理工厂做一些准备工作");
        factory.produceCloth();
        System.out.println("代理工厂做一些后续的收尾工作");
    }
}

//被代理类
class NikeClothFactory implements ClothFactory{

    @Override
    public void produceCloth() {
        System.out.println("Nike工厂生产一批运动服");
    }
}

public class StaticProxyTest {
    public static void main(String[] args) {
        //创建被代理类的对象
        NikeClothFactory nike = new NikeClothFactory();
        //创建代理类对象
        ProxyClothFactory proxyClothFactory = new ProxyClothFactory(nike);

        proxyClothFactory.produceCloth();

    }

}