【JAVA】 代理Proxy的实现

标签：java   代理   proxy   

假设没有中间代理层：

接口

/**
 * 
 */
  
package com.tree.demo.proxy;  
/**  
 * ClassName:ITalkInterface <br/>  
 * Function: TODO ADD FUNCTION. <br/>  
 * Reason:   TODO ADD REASON. <br/>  
 * Date:     2014年12月25日 下午3:41:56 <br/>  
 * @author   chiwei  
 * @version    
 * @since    JDK 1.6  
 * @see        
 */
public interface ITalkInterface {

	public String talk(String msg,String who);
	
}
  

package com.tree.demo.proxy;

/**
 * ClassName:Student <br/>
 * Function: TODO ADD FUNCTION. <br/>
 * Reason: TODO ADD REASON. <br/>
 * Date: 2014年12月25日 下午3:46:19 <br/>
 * 
 * @author chiwei
 * @version
 * @since JDK 1.6
 * @see
 */
public class Student implements ITalkInterface {

	private String school;

	private String grade;

	private int age;

	public String getSchool() {
		return school;
	}

	public void setSchool(String school) {
		this.school = school;
	}

	public String getGrade() {
		return grade;
	}

	public void setGrade(String grade) {
		this.grade = grade;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Student() {

	}

	public Student(String school, String grade, int age) {
		super();
		this.school = school;
		this.grade = grade;
		this.age = age;
	}

	@Override
	public String talk(String msg, String who) {

		// TODO Auto-generated method stub
		return "Hi " + who + ",I am a Student" + ",I'm in School "
				+ this.getSchool() + ",grade " + this.getGrade() + ","
				+ this.getAge() + " years old ! I want to say " + msg;
	}

}

package com.tree.demo.proxy;

/**
 * ClassName:Worker <br/>
 * Function: TODO ADD FUNCTION. <br/>
 * Reason: TODO ADD REASON. <br/>
 * Date: 2014年12月25日 下午3:51:16 <br/>
 * 
 * @author chiwei
 * @version
 * @since JDK 1.6
 * @see
 */
public class Worker implements ITalkInterface {

	private String factory;

	private double salary;

	public String getFactory() {
		return factory;
	}

	public void setFactory(String factory) {
		this.factory = factory;
	}

	public double getSalary() {
		return salary;
	}

	public void setSalary(double salary) {
		this.salary = salary;
	}

	public Worker() {

	}

	public Worker(String factory, double salary) {
		super();
		this.factory = factory;
		this.salary = salary;
	}

	@Override
	public String talk(String msg, String who) {

		// TODO Auto-generated method stub
		return "Worker: " + who + " say " + msg + ",factory:"
				+ this.getFactory() + ",salary:" + this.getSalary();
	}

}

这时候如果说学生或者工人都想唱歌怎么办呢？

难道talk接口添加唱歌方法，然后学生和工人实现类都实现唱歌方法？？？而且还是必须得实现唱歌方法，不唱都不行啊！！！这是不是很坑爹呢？？？？？

这时候我们就需要一个中间代理层来解决这个问题了！！！

代理类

 
package com.tree.demo.proxy;  
/**  
 * ClassName:TalkProxy <br/>  
 * Function: TODO ADD FUNCTION. <br/>  
 * Reason:   TODO ADD REASON. <br/>  
 * Date:     2014年12月25日 下午3:55:31 <br/>  
 * @author   chiwei  
 * @version    
 * @since    JDK 1.6  
 * @see        
 */
public class TalkProxy implements ITalkInterface {

	ITalkInterface talk;
	
	public TalkProxy(ITalkInterface talk) {
		System.out.println(talk.getClass().getName());
		this.talk = talk;
	}
	
	@Override
	public String talk(String msg, String who) {

		// TODO Auto-generated method stub  
		return talk.talk(msg, who);
	}
	
	public String sing(String song) {
		return "I am singing a song named " + song;
	}

}
  

public static void main(String[] args) {

		// TODO Auto-generated method stub  
		Student s1 = new Student("TsingHua","1",22);
		System.out.println(s1.talk("s1", "Jim"));
		Worker w1 = new Worker("China Mobile", 2000.0);
		System.out.println(w1.talk("w1", "Tom"));
		
		TalkProxy tp = new TalkProxy(s1);
		System.out.println(tp.sing("我的中国梦"));
		
		TalkProxy tp2 = new TalkProxy(w1);
		System.out.println(tp2.sing("咱们老百姓"));
		
		
	}

这里的代理类的作用也就是代理了一个唱歌的方法，想唱歌就不用再去修改接口，修改实现类了，很简单，很灵活！

如果你还想骂人，就在代理类里添加一个骂人的方法，谁想骂人就传谁进去就行了！！！

【JAVA】 代理Proxy的实现

标签：java   代理   proxy   

原文地址：http://blog.csdn.net/simonchi/article/details/42167923