RMI版HelloWorld

1.创建远程接口

 

package com.wilian.rmi.server;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface HelloWorld extends Remote{//必须继承Remote接口
        //必须要抛出RemoteExcepttion的异常,不然启动远程服务时会报错java.rmi.server.ExportException: remote object implements illegal remote interface;
	String sayHello(String name) throws RemoteException;
}

 

2.创建远程对象

package com.wilian.rmi.server;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class HelloWorldImpl extends UnicastRemoteObject implements HelloWorld {

	protected HelloWorldImpl() throws RemoteException {}

	@Override
	public String sayHello(String name) throws RemoteException {
		return "Hello "+name;
	}

}

 3.创建远程服务器

package com.wilian.rmi.server;

import java.rmi.RemoteException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class HelloWorldServer {

	public static void main(String[] args) {
		try {
			HelloWorld hello=new HelloWorldImpl();
			Context namingContext=new InitialContext();
                        //使用本地JNDI注册服务,注册格式为rmi://host//服务名，如果JNDI服务器在与远程服务器在同一机器可省略掉host
			namingContext.rebind("rmi:HelloWorld", hello);
			System.out.println("服务器注册了一个HelloWorld对象");
		} catch (RemoteException e) {
			e.printStackTrace();
		} catch (NamingException e) {
			e.printStackTrace();
		}
		
	}

}

 4.创建客户端程序

package com.wilian.rmi.client;

import java.rmi.RemoteException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import com.wilian.rmi.server.HelloWorld;


public class HelloWorldClient {

	public static void main(String[] args) {
		String url="rmi://localhost/";
		try {
			Context namingContext = new InitialContext();
                        //从JNDI服务器上寻找对应的服务
			HelloWorld hello = (HelloWorld)namingContext.lookup(url+"HelloWorld");
                        System.out.println(hello.getClass().getName());
			System.out.println(hello.sayHello("wilian"));
		} catch (NamingException e) {
			e.printStackTrace();
		} catch (RemoteException e) {
			e.printStackTrace();
		}
	}
}

 5.运行程序

    启动JNDI服务：start rmiregistry 如果是用eclipse进行开发必须到工程对应的bin目录下进行启动，否则会报HelloWorld类无法找到 

    启动服务端

    启动客户端

    运行截图