设计模式复习 之 代理模式

1. Java实现

interface NetWork
{
    public abstract void browser();
}
class Real implements NetWork
{
    @Override
    public void browser() {
        // TODO Auto-generated method stub
        System.out.println("浏览信息");
    }
}
public class designpattern_proxy implements NetWork{
    private NetWork newwork;
    designpattern_proxy(NetWork network)
    {
        this.newwork = network;
    }
    @Override
    public void browser() {
        // TODO Auto-generated method stub
        this.newwork.browser();    
    }
    public static void main(String [] args)
    {
        new designpattern_proxy(new Real()).browser();
    }
}

　　2. 动态代理

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

interface NetWork
{
    public abstract void browser();
}
class Real implements NetWork
{
    @Override
    public void browser() {
        // TODO Auto-generated method stub
        System.out.println("浏览信息");
    }
}

//继承自InvocationHandler Override它的invoke()方法

  public class designpattern_dynmicproxy implements InvocationHandler{
    private Object sub;
    public designpattern_dynmicproxy(){}
    public designpattern_dynmicproxy(Object obj)
    {
        this.sub  = obj;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        // TODO Auto-generated method stub
        System.out.println("before calling " + method);
        method.invoke(sub, args);
        System.out.println("after calling " + method);
        return null;
    }
    
    
    public static void main(String [] args)
    {
        Real r = new Real();
        InvocationHandler ds = new designpattern_dynmicproxy(r);
        Class cls = r.getClass();
        NetWork nw = (NetWork)Proxy.newProxyInstance(cls.getClassLoader(), cls.getInterfaces(),ds);
        nw.browser();
    }
    

}