@IgnoreAuth
@PostMapping(value = "/login")
public R login(String username, String password, String captcha, HttpServletRequest request) {
   UsersEntity user = userService.selectOne(new EntityWrapper<UsersEntity>().eq("username", username));
   if(user==null || !user.getPassword().equals(password)) {
      return R.error("账号或密码不正确");
   }
   String token = tokenService.generateToken(user.getId(),username, "users", user.getRole());
   return R.ok().put("token", token);
}

  @Override
  public String generateToken(Long userid,String username, String tableName, String role) {
    TokenEntity tokenEntity = this.selectOne(new EntityWrapper<TokenEntity>().eq("userid", userid).eq("role", role));
    String token = CommonUtil.getRandomString(32);
    Calendar cal = Calendar.getInstance();   
      cal.setTime(new Date());   
      cal.add(Calendar.HOUR_OF_DAY, 1);
    if(tokenEntity!=null) {
      tokenEntity.setToken(token);
      tokenEntity.setExpiratedtime(cal.getTime());
      this.updateById(tokenEntity);
    } else {
      this.insert(new TokenEntity(userid,username, tableName, role, token, cal.getTime()));
    }
    return token;
  }



/**
 * 权限(Token)验证
 */
@Component
public class AuthorizationInterceptor implements HandlerInterceptor {

    public static final String LOGIN_TOKEN_KEY = "Token";

    @Autowired
    private TokenService tokenService;
    
  @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

    //支持跨域请求
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with,request-source,Token, Origin,imgType, Content-Type, cache-control,postman-token,Cookie, Accept,authorization");
        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
  // 跨域时会首先发送一个OPTIONS请求，这里我们给OPTIONS请求直接返回正常状态
  if (request.getMethod().equals(RequestMethod.OPTIONS.name())) {
          response.setStatus(HttpStatus.OK.value());
            return false;
        }
        
        IgnoreAuth annotation;
        if (handler instanceof HandlerMethod) {
            annotation = ((HandlerMethod) handler).getMethodAnnotation(IgnoreAuth.class);
        } else {
            return true;
        }

        //从header中获取token
        String token = request.getHeader(LOGIN_TOKEN_KEY);
        
        /**
         * 不需要验证权限的方法直接放过
         */
        if(annotation!=null) {
          return true;
        }
        
        TokenEntity tokenEntity = null;
        if(StringUtils.isNotBlank(token)) {
          tokenEntity = tokenService.getTokenEntity(token);
        }
        
        if(tokenEntity != null) {
          request.getSession().setAttribute("userId", tokenEntity.getUserid());
          request.getSession().setAttribute("role", tokenEntity.getRole());
          request.getSession().setAttribute("tableName", tokenEntity.getTablename());
          request.getSession().setAttribute("username", tokenEntity.getUsername());
          return true;
        }
        
    PrintWriter writer = null;
    response.setCharacterEncoding("UTF-8");
    response.setContentType("application/json; charset=utf-8");
    try {
        writer = response.getWriter();
        writer.print(JSONObject.toJSONString(R.error(401, "请先登录")));
    } finally {
        if(writer != null){
            writer.close();
        }
    }
//        throw new EIException("请先登录", 401);
    return false;
    }
}

-- ----------------------------
-- Table structure for token
-- ----------------------------
DROP TABLE IF EXISTS `token`;
CREATE TABLE `token` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `userid` bigint(20) NOT NULL COMMENT '用户id',
  `username` varchar(100) NOT NULL COMMENT '用户名',
  `tablename` varchar(100) DEFAULT NULL COMMENT '表名',
  `role` varchar(100) DEFAULT NULL COMMENT '角色',
  `token` varchar(200) NOT NULL COMMENT '密码',
  `addtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '新增时间',
  `expiratedtime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '过期时间',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=27 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT COMMENT='token表';

-- ----------------------------
-- Records of token
-- ----------------------------
INSERT INTO `token` VALUES ('9', '23', 'cd01', 'xuesheng', '学生', 'al6svx5qkei1wljry5o1npswhdpqcpcg', '2023-02-23 21:46:45', '2023-03-15 14:01:36');
INSERT INTO `token` VALUES ('10', '11', 'xh01', 'xuesheng', '学生', 'fahmrd9bkhqy04sq0fzrl4h9m86cu6kx', '2023-02-27 18:33:52', '2023-03-17 18:27:42');
INSERT INTO `token` VALUES ('11', '17', 'ch01', 'xuesheng', '学生', 'u5km44scxvzuv5yumdah2lhva0gp4393', '2023-02-27 18:46:19', '2023-02-27 19:48:58');
INSERT INTO `token` VALUES ('12', '1', 'admin', 'users', '管理员', 'h1pqzsb9bldh93m92j9m2sljy9bt1wdh', '2023-02-27 19:37:01', '2023-03-17 18:23:02');
INSERT INTO `token` VALUES ('13', '21', 'xiaohao', 'shezhang', '社长', 'zdm7j8h1wnfe27pkxyiuzvxxy27ykl2a', '2023-02-27 19:38:07', '2023-03-17 18:25:20');
INSERT INTO `token` VALUES ('14', '27', 'djy01', 'xuesheng', '学生', 'g3teq4335pe21nwuwj2sqkrpqoabqomm', '2023-03-15 12:56:17', '2023-03-15 14:00:16');
INSERT INTO `token` VALUES ('15', '29', 'dajiyue', 'shezhang', '社长', '0vb1x9xn7riewlp5ddma5ro7lp4u8m9j', '2023-03-15 12:58:08', '2023-03-15 14:03:48');