RPC框架一，RMI远程调用实例

网上找了好久关于RMI调用的实例，大多都是本地调用的，远程调用的示例很少，所以自己整理一版。

首先 从server端开始：

服务端###############

具体步骤：

1，写个RMI接口 MyRmiService.java

2，写个RMI接口实现 MyRmiServiceImpl.java

3，写个RMI服务端程序  RmiSeverTest.java（main方法，注意此类需要和RMI接口实现在同个包下，或者子包中，原因是接口实现的无参构造器是protected权限）

具体代码：

MyRmiService.java---------------------------------------------------------
package com.rmi.service;

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

public interface MyRmiService  extends Remote {
    public String sayHello () throws RuntimeException, RemoteException;
}

MyRmiServiceImpl.java----------------------------------------------------------------------------------

package com.rmi.service.impl;

import com.rmi.service.MyRmiService;

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

public class MyRmiServiceImpl  extends UnicastRemoteObject implements MyRmiService {
    private static final long serialVersionUID = 1L;
    protected MyRmiServiceImpl() throws RemoteException {
        super();
    }
    @Override
    public String sayHello() throws RemoteException {
        return "Hello world";
    }
}
RmiSeverTest.java----------------------------------------------------------------------

package com.rmi.service.impl;

import com.rmi.service.MyRmiService;

import java.rmi.Naming;
import java.rmi.registry.LocateRegistry;

public class RmiSeverTest {
    private static final String START_FAIL = "MyRmiService start error";
    private static final String START_SUCC = "MyRmiService start success";
    private static final int RMI_SERVER_PORT = 1099;
    private static final String RMI_SERVER_NAME ="rmi://10.206.66.166:1099/sayHello";
    private static final String START_INFO =",waste time(ms) ";

    public static void main(String[] args) {
        boolean runSucc = true;
        //创建服务
        long begintime = System.currentTimeMillis();
        try {
            LocateRegistry.createRegistry(RMI_SERVER_PORT);
            // 以下是向LocateRegistry注册（绑定/重绑定）RMI Server实现。
            MyRmiService myRmiService = new MyRmiServiceImpl();
            // 通过java 名字服务技术，可以讲具体的RMI Server实现绑定一个访问路径。注册到LocateRegistry中
            Naming.rebind(RMI_SERVER_NAME, myRmiService);

        } catch (Exception e) {
            runSucc = false;
            e.printStackTrace();
        }
        long endtime = System.currentTimeMillis();
        System.out.println((runSucc?START_SUCC:START_FAIL)+START_INFO +(endtime -begintime));
    }
}

启动main方法，则客户端正常启动了

现在我们就可以远程调用了，但是在写客户端代码之前我们需要准备客户端代理，

远程客户端############

生成客户端代理class  MyRmiServiceImpl_Stub.class----->具体步骤如下：

当前项目的target\classes目录下（C:\Users\zxx\IdeaProjects\testProject\target\classes）

执行cmd命令到控制台

在控制台执行命令 rmic com.rmi.service.MyRmiServiceImpl 生成MyRmiServiceImpl_Stub.class文件

命令行提示如下：

将项目打包为rmi-sub-1.0.0.jar （去除其他文件，仅保留必须的MyRmiService.class,MyRmiServiceImpl_Stub.class两个文件）

客户端导入此jar包，开始书写客户端调用类 ClientRmiTest.java

package com.rmi.test;

import com.rmi.service.MyRmiService;

import javax.naming.NamingException;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;


public class ClientRmiTest {
    public static void main(String[] args) throws NamingException, RemoteException, NotBoundException, MalformedURLException {
        System.out.println( ((MyRmiService) Naming.lookup("rmi://10.206.66.166/sayHello")).sayHello());
    }
}

执行main方法远程调用RMI服务