spring:
 redis:
  database: 0  #redis的默認(rèn)數(shù)據(jù)庫(kù)為0
  host: 127.0.0.1 #鏈接redis的ip
  port: 6379 #鏈接redis的端口號(hào)
  password:  #鏈接redis的密碼 默認(rèn)為空
  jedis:
   pool:
    max-total: 200  #鏈接redis的總數(shù)目
    max-active: 100 #鏈接redis的最大
    max-idle: 8   #最大的鏈接數(shù)量
    min-idle: 5   #最小的鏈接數(shù)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: true
server:
 port: 8888

REDIS_KEY : USER_TOKEN

@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;
}

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

@Service
public class UserServiceImpl{
  @Autowired
  private UserDao userDao;
  @Autowired
  private JedisDao jedisDao;
  @Value("${REDIS_KEY}")  //從配置文件中取值
  private String KEY;
  private Map<Integer,String> UserLogin = new HashMap<>();
  /**
   * 登錄
   * @param request
   * @param response
   * @param u
   * @return
   */
  public User userlogin(HttpServletRequest request, HttpServletResponse response, User u){
    //查詢(xún)登錄是否成功
    User user=userDao.findByUsernameAndPassword(u.getUsername(),u.getPassword());
    //判斷us是否為空
    if(user==null){
      return null;
    }
    //生成token
    String token="user_"+ UUID.randomUUID().toString();
    //從map中獲得redis中的key
    String oldToken = UserLogin.get(user.getId());
    //判斷map中是否存在該id
    if(!StringUtils.isEmpty(oldToken)){
      //刪除redis中老的值
      jedisDao.delValue(oldToken);
    }
    //將新的的key保存到map中
    UserLogin.put(user.getId(),token);
    //將信息存入redis
    jedisDao.setValue(token, JsonUtils.objectToJson(user));
    //將token放入cookie中
    CookieUtils.setCookie(request,response,KEY,token,5*60,true);
    return user;
  }

  /**
   * 判斷是否登錄
   * @param response
   * @param request
   * @return
   */
  public String getUserByToken(HttpServletResponse response, HttpServletRequest request) {
    //從cookie中取出用戶(hù)token
    String token=CookieUtils.getCookieValue(request,KEY);
    //從redis中取出用戶(hù)信息
    String user= jedisDao.getValue(token);
    return user;
  }
}

@RestController
public class LoginController {
  @Autowired
  private UserServiceImpl userService;
  /**
   * 登錄
   * @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("登錄成功！");
        return responseResult;
      }else{
        responseResult.setState(202);
        responseResult.setMsg("用戶(hù)名或密碼錯(cuò)誤！");
        return responseResult;
      }
    }catch (Exception e) {
      responseResult.setState(500);
      responseResult.setMsg("發(fā)生錯(cuò)誤，登錄失??！");
      return responseResult;
    }
  }
  /**
   * 判斷是否登錄
   * @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("登錄中！");
        return responseResult;
      }else{
        responseResult.setState(202);
        responseResult.setMsg("在別處登錄！");
        return responseResult;
      }
    }catch (Exception e){
      response.setStatus(500);
      responseResult.setMsg("發(fā)生錯(cuò)誤！");
      return responseResult;
    }
  }
}

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'
//注冊(cè) VueAxios, axios
Vue.use(VueAxios, axios)
Vue.use(ElementUI)
//配置axios支持cookie
axios.defaults.withCredentials = true;

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
 }]

})