1.在UserMapper.xml下添加

	<select id="findByUserId" resultType="User">select *from user where id=#{user_id}</select>

2.在UserMapper.java下添加

User findByUserId(@Param("user_id") Integer userId);

3.在UserService.java下添加

User findByUserId(Integer userId);

4.在UserServiceImpl下添加

    @Overridepublic User findByUserId(Integer userId) {User user = userMapper.findByUserId(userId);return user;}

5.在UserController.java下添加

    /** 根据用户id查询用户信息* @param request* @return* */@GetMapping("find_by_token")public JsonData findUSerInfoByToken(HttpServletRequest request){Integer userId = (Integer) request.getAttribute("user_id");if(userId == null){return JsonData.buildError("查询失败");}User user = userService.findByUserId(userId);return JsonData.buildSuccess(user);}