创建第一个rmi应用

//创建远程接口 

package hello;

import java.util.Date;

import java.rmi.*;

public interface HelloService extends Remote{

  public String echo(String msg) throws RemoteException;

  public Date getTime() throws RemoteException;

} 

//创建远程类 

package hello;

import java.util.Date;

import java.rmi.*;

import java.rmi.server.UnicastRemoteObject;

public class HelloServiceImpl extends UnicastRemoteObject implements HelloService{

  private String name;

  public HelloServiceImpl(String name)throws RemoteException{

    this.name=name;

  }

  public String echo(String msg)throws RemoteException{

    System.out.println(name+":调用echo()方法");

    return "echo:"+msg +" from "+name;

  }

  public Date getTime()throws RemoteException{

    System.out.println(name+":调用getTime()方法");

    return new Date();

  }

} 

//SimpleServer.java

package hello;

import java.rmi.*;

import javax.naming.*;

public class SimpleServer{

  public static void main( String args[] ){

    try{

       HelloService service1 = new HelloServiceImpl("service1");

       HelloService service2 = new HelloServiceImpl("service2");

       Context namingContext=new InitialContext();

       namingContext.rebind( "rmi:HelloService1", service1 );

       namingContext.rebind( "rmi:HelloService2", service2 );

/*     

       namingContext.rebind( "rmi://localhost:8000/HelloService1", service1 );

       namingContext.rebind( "rmi://localhost:8000/HelloService1", service2 );

*/   

    

       System.out.println( "服务器注册了两个HelloService对象" );

    }catch(Exception e){

       e.printStackTrace();

    } 

  }

}

//SimpleClient.java

 

package hello;

 

import java.rmi.*;

import javax.naming.*;

public class SimpleClient{

  public static void showRemoteObjects(Context namingContext)throws Exception{

    NamingEnumeration<NameClassPair> e=namingContext.list("rmi:");

    while(e.hasMore()) 

     System.out.println(e.next().getName());

  }

  public static void main( String args[] ){

    String url="rmi://localhost/";

    try{

      System.setProperty("java.security.policy",SimpleClient.class.getResource("client.policy").toString());

System.setSecurityManager(new RMISecurityManager());

      Context namingContext=new InitialContext();

      HelloService service1=(HelloService)namingContext.lookup(url+"HelloService1");

      HelloService service2=(HelloService)namingContext.lookup(url+"HelloService2"); 

      

      Class stubClass=service1.getClass();

      System.out.println("service1是"+stubClass.getName()+"的实例"); 

      Class[] interfaces=stubClass.getInterfaces();

      for(int i=0;i<interfaces.length;i++)  

        System.out.println("存根类实现了"+interfaces[i].getName()); 

 

      System.out.println(service1.echo("hello")); 

      System.out.println(service1.getTime()); 

      System.out.println(service2.echo("hello")); 

      System.out.println(service2.getTime()); 

      

      showRemoteObjects(namingContext);

    }catch( Exception e){

       e.printStackTrace();

    }

  }

}