抽象主题类

package com.lw.pd.Proxy;//抽象主题类public interface Subject {	//定义一个方法	public void request();}

真是主题类

package com.lw.pd.Proxy;//真是主题类public class RealSubject implements Subject {	//实现方法	public void request() {		//业务逻辑处理	}}

代理类

package com.lw.pd.Proxy;//代理类public class Proxy implements Subject {	//要代理那个实现类	private Subject subject = null;	//实现接口中定义的方法	public void request() {		this.before();		this.subject.request();		this.after();	}	private void after() {		//do something	}	private void before() {		//do something	}	//默认被代理者	public Proxy() {		this.subject = new Proxy();	}	//通过构造函数传递代理者	/*public Proxy(Object object){	}*/	public Proxy(Subject _subject){		this.subject = _subject;	}}