利用HADOOP中的jar写一个RPC

RPC调用需要服务端和客户端使用相同的协议：

协议：

package cn.itcast.bigdata.hadooprpc.protocol;

public interface IUserLoginService {

    public static final long versionID = 100L;
    public String login(String name,String passwd);
    
}

这里协议就是接口

服务端的实现类：

package cn.itcast.bigdata.hadooprpc.service;

import cn.itcast.bigdata.hadooprpc.protocol.IUserLoginService;

public class UserLoginServiceImpl implements IUserLoginService{

    @Override
    public String login(String name, String passwd) {
        
        return name + "logged in successfully...";
    }
    
    
    

}

发布服务：

package cn.itcast.bigdata.hadooprpc.service;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RPC.Builder;
import org.apache.hadoop.ipc.RPC.Server;

import cn.itcast.bigdata.hadooprpc.protocol.ClientNamenodeProtocol;
import cn.itcast.bigdata.hadooprpc.protocol.IUserLoginService;

public class PublishServiceUtil {

    public static void main(String[] args) throws Exception {
    
        
        
        Builder builder= new RPC.Builder(new Configuration());
        builder.setBindAddress("localhost")
        .setPort(9999)
        .setProtocol(IUserLoginService.class)
        .setInstance(new UserLoginServiceImpl());
        
        Server server= builder.build();
        server.start();
        
        
        
        
        
        
    }
    
}

客户端调用RPC服务：

package cn.itcast.bigdata.hadooprpc.client;

import java.net.InetSocketAddress;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.RPC;

import cn.itcast.bigdata.hadooprpc.protocol.IUserLoginService;

public class UserLoginAction {
    public static void main(String[] args) throws Exception {
        IUserLoginService userLoginService = RPC.getProxy(IUserLoginService.class, 100L, 
                new InetSocketAddress("localhost", 9999), new Configuration());
        String login = userLoginService.login("angelababy", "1314520");
        System.out.println(login);
        
    }
}

　　使用的hadoop的hadoop-common-2.6.4.jar这个j包，在其他工程也可以使用