Java 设计模式 之 代理模式

http://www.verejava.com/?id=16999158881575

package com.proxy.theory;

public class TestProxy
{
	public static void main(String[] args)
	{
		//要做的目标
		Target target=new Target();
		//我来处理目标
		MyHandler myhandler=new MyHandler();
		myhandler.setTarget(target);
		//代码帮助处理目标
		MyProxy proxy=new MyProxy();
		proxy.setMyHandler(myhandler);
		
		//TargetInterface ti=(TargetInterface)proxy.getProxy(target);
		//ti.doSomething();
		TargetInterface2 ti=(TargetInterface2)proxy.getProxy(target);
		ti.study();
		
	}
}





package com.proxy.theory;

public interface TargetInterface
{
	public void doSomething();
}





package com.proxy.theory;

public interface TargetInterface2
{
	public void study();
}





package com.proxy.theory;

public class Target implements TargetInterface,TargetInterface2
{

	@Override
	public void doSomething()
	{
		System.out.println("注册公司");
	}

	@Override
	public void study()
	{
		System.out.println("去留学");
	}

}





package com.proxy.theory;

import java.lang.reflect.Proxy;

public class MyProxy
{
	
	private MyHandler myhandler;
	
	public void setMyHandler(MyHandler myhandler)
	{
		this.myhandler=myhandler;
	}
	
	public Object getProxy(Object target)
	{
		//代理帮助 返回 myhandler 要处理的所有 可能的接口
		return Proxy.newProxyInstance(MyProxy.class.getClassLoader(), target.getClass().getInterfaces(), myhandler);
	}
}





package com.proxy.theory;

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

public class MyHandler implements InvocationHandler
{
	private Object target;
	
	public void setTarget(Object target)
	{
		this.target=target;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable
	{
		System.out.println("before");
		method.invoke(target, args);
		System.out.println("after");
		return null;
	}

}

http://www.verejava.com/?id=16999158881575