1、创建SpringBoot项目，创建User表，由于是通过Vue编写的，所以是前后端分离，需要跨域，我这里编写了跨域配置类，还有redis的util类，返回的封装类，cookie的util类，文末有源码提供，可以自行提取。

2、yum配置文件

spring: redis:  database: 0  #redis的默认数据库为0  host: 127.0.0.1 #链接redis的ip  port: 6379 #链接redis的端口号  password:  #链接redis的密码 默认为空  jedis:   pool:    max-total: 200  #链接redis的总数目    max-active: 100 #链接redis的最大    max-idle: 8   #最大的链接数量    min-idle: 5   #最小的链接数量 datasource:  url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true  username: root  password: root  driver-class-name: com.mysql.jdbc.Driver jpa:  show-sql: trueserver: port: 8888REDIS_KEY : USER_TOKEN

3、编写实体User.class

@Data@Entity@Table(name = "user")public class User {  @Id  @Column(name = "id",unique = true,nullable = false)  private int id;  @Column(name = "username",nullable = false)  private String username;  @Column(name = "password",nullable = false)  private String password;}

4、编写Dao，UserDao.class

public interface UserDao extends JpaRepository {  public User findByUsernameAndPassword(String username, String password);}

5、编写serviceImpl,UserServiceImpl.class进行登录的业务逻辑处理

@Servicepublic class UserServiceImpl{  @Autowired  private UserDao userDao;  @Autowired  private JedisDao jedisDao;  @Value("${REDIS_KEY}")  //从配置文件中取值  private String KEY;  private Map UserLogin = new HashMap<>();  /**   * 登录   * @param request   * @param response   * @param u   * @return   */  public User userlogin(HttpServletRequest request, HttpServletResponse response, User u){    //查询登录是否成功    User user=userDao.findByUsernameAndPassword(u.getUsername(),u.getPassword());    //判断us是否为空    if(user==null){      return null;    }    //生成token    String token="user_"+ UUID.randomUUID().toString();    //从map中获得redis中的key    String oldToken = UserLogin.get(user.getId());    //判断map中是否存在该id    if(!StringUtils.isEmpty(oldToken)){      //删除redis中老的值      jedisDao.delValue(oldToken);    }    //将新的的key保存到map中    UserLogin.put(user.getId(),token);    //将信息存入redis    jedisDao.setValue(token, JsonUtils.objectToJson(user));    //将token放入cookie中    CookieUtils.setCookie(request,response,KEY,token,5*60,true);    return user;  }  /**   * 判断是否登录   * @param response   * @param request   * @return   */  public String getUserByToken(HttpServletResponse response, HttpServletRequest request) {    //从cookie中取出用户token    String token=CookieUtils.getCookieValue(request,KEY);    //从redis中取出用户信息    String user= jedisDao.getValue(token);    return user;  }}

6、编写controller，接收前端请求，返回数据

@RestControllerpublic class LoginController {  @Autowired  private UserServiceImpl userService;  /**   * 登录   * @param response   * @param request   * @param user   * @param model   * @return   */  @PostMapping("/login")  public ResponseResult Login(HttpServletResponse response , HttpServletRequest request, @RequestBody User user, Model model){    ResponseResult responseResult=new ResponseResult();    try {      User user2 = userService.userlogin(request, response, user);      if (user2!=null){        responseResult.setState(200);        responseResult.setMsg("登录成功！");        return responseResult;      }else{        responseResult.setState(202);        responseResult.setMsg("用户名或密码错误！");        return responseResult;      }    }catch (Exception e) {      responseResult.setState(500);      responseResult.setMsg("发生错误，登录失败！");      return responseResult;    }  }  /**   * 判断是否登录   * @param response   * @param request   * @return   * @throws Exception   */  @GetMapping("/toLogin")  public ResponseResult getUserInfo(HttpServletResponse response , HttpServletRequest request) throws Exception {    ResponseResult responseResult=new ResponseResult();    try{      String token = userService.getUserByToken(response, request);      if(token!=null){        responseResult.setState(200);        responseResult.setMsg("登录中！");        return responseResult;      }else{        responseResult.setState(202);        responseResult.setMsg("在别处登录！");        return responseResult;      }    }catch (Exception e){      response.setStatus(500);      responseResult.setMsg("发生错误！");      return responseResult;    }  }}

Vue前端

1、创建Vue项目：vue init webpack 项目名称2、引入axios：npm install --save axios vue-axios3、引入element：npm i element-ui -S4、在src的main.js下配置

import axios from 'axios'import VueAxios from 'vue-axios'// element-ui 引入文件import ElementUI from 'element-ui'import 'element-ui/lib/theme-chalk/index.css'//注册 VueAxios, axiosVue.use(VueAxios, axios)Vue.use(ElementUI)//配置axios支持cookieaxios.defaults.withCredentials = true;

5、在src的components下创建login.vue,userinfo.vue,并在src的router下配置访问地址

import Vue from 'vue'import Router from 'vue-router'import login from '@/components/login'import UserInfo from '@/components/userinfo'Vue.use(Router)export default new Router({ routes: [{  path: '/login',  component: login }, {  path: '/user_info',  component: UserInfo }]})