如何实现自己的 validation

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// 抛出异常
private void validateParam(Map<String, String> paramValues) {
        boolean validate = MapUtils.isEmpty(paramValues)
                || !paramValues.containsKey(ParamConstant.CUSTOMER_N0)
                || StringUtils.isEmpty(paramValues.get(ParamConstant.CUSTOMER_N0));
        if (validate) {
            throw new DataBusinessException(ResultCodeEnum.PARAM_NULL);
        }
    }
    
// spring 的 valiator
public class ContactNumberValidator implements 
  ConstraintValidator<ContactNumberConstraint, String> {

    @Override
    public void initialize(ContactNumberConstraint contactNumber) {
    }

    @Override
    public boolean isValid(String contactField,
      ConstraintValidatorContext cxt) {
        return contactField != null && contactField.matches("[0-9]+")
          && (contactField.length() > 8) && (contactField.length() < 14);
    }

}

// valid 注解
    @PostMapping("/addValidatePhone")
    public String submitForm(@Valid ValidatedPhone validatedPhone,
      BindingResult result, Model m) {
        if(result.hasErrors()) {
            return "phoneHome";
        }
        m.addAttribute("message", "Successfully saved phone: "
          + validatedPhone.toString());
        return "phoneHome";
    }