Java 动态代理详解

package com.at221;

//代理设计模式：

interface ClothFactory{
    void product();
}

class NikeFactory implements ClothFactory{//被代理类：

    @Override
    public void product() {
        System.out.println("Nike服装很可靠");
    }
    
}

class ProxyFactory implements ClothFactory{//代理类：

    private NikeFactory nf;
    
    public ProxyFactory(NikeFactory nf){
        this.nf = nf;
    }
    @Override
    public void product() {
        this.nf.product();
    }
    
}

public class TestProxy {
    public static void main(String[] args) {
        NikeFactory nf = new NikeFactory();
        ProxyFactory pf = new ProxyFactory(nf);
        pf.product();
    }
}

下面是利用反射机制进行实现的动态代理：

 

package com.at221;

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

interface Subject{
    void show();
}

class RealSubject implements Subject{

    @Override
    public void show() {
        System.out.println("zhaoning,i love you!!!");
    }
    
}

class ProxySubject implements InvocationHandler{
    Object obj;
    public Object blind(Object obj){
        this.obj = obj;
        return Proxy.newProxyInstance(obj.getClass().getClassLoader(), 
                                        obj.getClass().getInterfaces(), this);
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        Object returnVal = method.invoke(obj, args);
        return returnVal;
    }

}

public class TestProxy1{
    public static void main(String[] args) {
        RealSubject rs = new RealSubject();
        ProxySubject ps = new ProxySubject();
        Subject rss = (Subject)ps.blind(rs);
        rss.show();
    }
}