@ExceptionHandler(BindException.class)
    @ResponseBody
    public Map<String, Object> bindExceptionHandler(BindException ex) throws Exception {
        String s  = ex.getFieldError().getField()+":"+ex.getFieldError().getDefaultMessage();
        Map<String,Object> map=new HashMap<>();
        map.put("code",400);
        map.put("msg",s);
        return map;
    }

   @ExceptionHandler(value = MethodArgumentNotValidException.class)
   @ResponseBody
   public Map<String, Object> bindExceptionHandler(MethodArgumentNotValidException ex) throws Exception {
       BindingResult result = ex.getBindingResult();
      StringBuilder s=new StringBuilder();
       if (result.hasErrors()) {

           List<ObjectError> errors = result.getAllErrors();
           errors.forEach(p ->{
               FieldError fieldError = (FieldError) p;
               s.append(fieldError.getField()+":"+fieldError.getDefaultMessage());
           });
       }
       Map<String,Object> map=new HashMap<>();
       map.put("code",400);
       map.put("msg",s);
       return map;
   }