Java中RMI远程调用方法

之前有两篇文章是关于RPC的，Java中的RMI则是一种特殊的RPC实现方式，都是远程方法调用，即客户端可以调用服务器端的方法

下面实现一个Java RMI

1.创建远程接口类RmiTest.java

package cn.ysjh;

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

public interface RMITest extends Remote {

    public String test() throws RemoteException;

}

2.创建实现远程接口的类RmiTestImpl.java

package cn.ysjh;

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

public class RMITestImpl extends UnicastRemoteObject implements RMITest {

    public RMITestImpl() throws RemoteException {
        super();
    }
    public String test() {

        return "hello world!";

    }
}

3.构建服务器端Server.java

package cn.ysjh;

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;

public class Server {

    public Server() {
        try {
            RMITestImpl rmiTest = new RMITestImpl();
            LocateRegistry.createRegistry(8880);
            try {
                Naming.rebind("rmi://localhost:8880/Service",rmiTest);
                System.out.println("Server start.......");
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args){

        new Server();

    }

}

4.构建客户端Client.java

package cn.ysjh;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.rmi.RemoteException;

public class Client {

    public static void main(String[] args) throws RemoteException {
        try {
            InitialContext context = new InitialContext();
            RMITest lookup = (RMITest) context.lookup("rmi://localhost:8880/Service");
            System.out.println("Client start...");
            System.out.println(lookup.test());
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }

}

运行时先运行服务器端Server.java，然后再运行客户端Client.java

运行效果截图：