博客

代码程序：

@PostMapping("selectById")
@ResponseBody
public Result selectById(@RequestBody int id) {
   Result result =new Result();
   List<User> list = userService.selectById(id);
   if(list.size()==1){
   result.setCode("000");
   result.setMsg("success");
   result.setData(list);
}else if(list.size()==0){
      result.setCode("E01");
      result.setMsg("输入的id找不到有效用户");
      result.setData(null);
   }else {
      result.setCode("E02");
      result.setMsg("输入的id找到大于1个有效用户");
      result.setData(list);
   }
   return result;
}