java静态代理模式

//HelloService.java 

package proxy;

import java.util.Date;

public interface HelloService{

  public String echo(String msg);

  public Date getTime();

} 

 

//

HelloServiceImpl.java

 

package proxy;

import java.util.Date;

public class HelloServiceImpl implements HelloService{

  public String echo(String msg){

    return "echo:"+msg;

  }

  public Date getTime(){

    return new Date();

  }

} 

 

//HelloServiceProxy.java 

 

package proxy;

import java.util.Date;

public class HelloServiceProxy implements HelloService{

  private HelloService helloService;

  public HelloServiceProxy(HelloService helloService){

    this.helloService=helloService;

  }

  public void setHelloServiceProxy(HelloService helloService){

    this.helloService=helloService;

  }

  public String echo(String msg){

    System.out.println("before calling echo()");

    String result=helloService.echo(msg);

    System.out.println("after calling echo()");

    return result;

  }

  public Date getTime(){

    System.out.println("before calling getTime()");

    Date date=helloService.getTime();

    System.out.println("after calling getTime()");

    return date;

  }

}

 

//Client1.java

package proxy;

public class Client1{

  public static void main(String args[]){

    HelloService helloService=new HelloServiceImpl();

    HelloService helloServiceProxy=new HelloServiceProxy(helloService);

    System.out.println(helloServiceProxy.echo("hello"));

  }

}