springboot使用Validator校验方式

@NotBlank(message = "用户名不能为空")
  private String username;
  @DecimalMin(value = "6", message = "密码长度不能少于6个字符")
  @DecimalMax(value = "20", message = "密码长度不能超过20个字符")
  private String password;

@ResponseBody
  @RequestMapping("save")
  public ResultModel<SysUser> save(@Valid SysUser sysUser, BindingResult result){
    if (result.hasErrors()){
      result.getAllErrors().forEach(error-> System.out.println(error.getDefaultMessage()));
    }
    return ResultModel.defaultSuccess(null);
  }