Spring使用RMI进行远程方法调用

（1）。我新建了三个项目，SpringRmiApi（存放提供者和消费者共有的xx，例如实体类以及服务接口等等）、SpringRmiService（服务提供者）、SpringRmiProvider（服务消费者）

以下是SpringRmiApi一些代码

 package cn.coreqi.entities;

 import java.io.Serializable;

 public class User implements Serializable {
     private Integer Id;
     private Integer Age;
     private String UserName;
     private String PassWord;
     private Integer Enabled;

     public User() {
     }

     public User(Integer id, Integer age, String userName, String passWord, Integer enabled) {
         Id = id;
         Age = age;
         UserName = userName;
         PassWord = passWord;
         Enabled = enabled;
     }

     public Integer getId() {
         return Id;
     }

     public void setId(Integer id) {
         Id = id;
     }

     public Integer getAge() {
         return Age;
     }

     public void setAge(Integer age) {
         Age = age;
     }

     public String getUserName() {
         return UserName;
     }

     public void setUserName(String userName) {
         UserName = userName;
     }

     public String getPassWord() {
         return PassWord;
     }

     public void setPassWord(String passWord) {
         PassWord = passWord;
     }

     public Integer getEnabled() {
         return Enabled;
     }

     public void setEnabled(Integer enabled) {
         Enabled = enabled;
     }

     @Override
     public String toString() {
         return "User{" +
                 "Id=" + Id +
                 ", Age=" + Age +
                 ", UserName='" + UserName + '\'' +
                 ", PassWord='" + PassWord + '\'' +
                 ", Enabled=" + Enabled +
                 '}';
     }
 }

 package cn.coreqi.service;

 import cn.coreqi.entities.User;

 import java.util.List;

 public interface UserService {
     public List<User> getAll();
     public User getById(int Id);
     public void addUser(User user);
     public void modifyUser(User user);
     public void delById(int Id);
 }

（2）服务提供者代码

 package cn.coreqi.service.impl;

 import cn.coreqi.entities.User;
 import cn.coreqi.service.UserService;
 import org.springframework.stereotype.Repository;

 import java.util.ArrayList;
 import java.util.List;

 @Repository
 public class UserServiceImpl implements UserService {
     private static List<User> users = null;
     static {
         users = new ArrayList<>();
         users.add(new User(1,24,"fanqi","123456",1));
         users.add(new User(2,22,"gaoxing","123456",1));
         users.add(new User(3,23,"xihuan","123456",1));
     }
     @Override
     public List<User> getAll() {
         return users;
     }

     @Override
     public User getById(int Id) {
         for (User user : users){
             if(user.getId() == Id){
                 return user;
             }
         }
         return null;
     }

     @Override
     public void addUser(User user) {
         users.add(user);
     }

     @Override
     public void modifyUser(User user) {
         delById(user.getId());
         addUser(user);
     }

     @Override
     public void delById(int Id) {
         for (User user : users){
             if(user.getId() == Id){
                 users.remove(user);
             }
         }
     }
 }

暴露服务

 package cn.coreqi.rmi;

 import cn.coreqi.service.UserService;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.remoting.rmi.RmiServiceExporter;

 @Configuration
 public class RmiConfig {
     @Bean
     public RmiServiceExporter rmiServiceExporter(UserService userService){
         RmiServiceExporter rmiServiceExporter = new RmiServiceExporter();
         rmiServiceExporter.setService(userService);
         rmiServiceExporter.setServiceName("UserService");
         rmiServiceExporter.setServiceInterface(UserService.class);
 //        rmiServiceExporter.setRegistryHost("coreqi.cn");
         rmiServiceExporter.setRegistryPort(1199);
         return rmiServiceExporter;
     }
 }

（3）服务消费者

引用服务

 package cn.coreqi.rmi;

 import cn.coreqi.service.UserService;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.remoting.rmi.RmiProxyFactoryBean;

 @Configuration
 public class RmiConfig {
     @Bean
     public RmiProxyFactoryBean userService(){
         RmiProxyFactoryBean rmiProxy = new RmiProxyFactoryBean();
         rmiProxy.setServiceUrl("rmi://localhost/UserService");
         rmiProxy.setServiceInterface(UserService.class);
         return rmiProxy;
     }
 }

使用服务

 package cn.coreqi.controller;

 import cn.coreqi.entities.User;
 import cn.coreqi.service.UserService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ResponseBody;

 import java.util.List;

 @Controller
 public class HomeController {
     @Autowired
     private UserService userService;

     @GetMapping("/home/index")
     @ResponseBody
     public Object index(){
         return userService.getAll();
     }
 }