Control

Control.java

    @RequestMapping(value = "/user/create", method = RequestMethod.POST)
    public String create(@Validated @ModelAttribute UserRequest userRequest, BindingResult result, Model model) {
        if (result.hasErrors()) {
            List<String> errorList = new ArrayList<>();
            for (ObjectError error : result.getAllErrors()) {
                String defaultMessage = Objects.requireNonNull(error.getDefaultMessage());
                String errorMessage = messageSource.getMessage(defaultMessage, null, defaultMessage, LocaleContextHolder.getLocale());
                errorList.add(errorMessage);

                // 添加以下日志输出
                System.out.println("Error Message: " + errorMessage);
            }
            model.addAttribute("validationError", errorList);

            return "user/add";
        }

        userService.create(userRequest);
        return "redirect:/user/list";
    }

    <!-- 在合适的位置添加，例如表单上方或下方 -->
    <div th:if="${validationError}">
      <div th:each="error : ${validationError}">
        <label class="text-danger" th:text="${error}"></label>
      </div>
    </div>