java - Spring 启动验证不起作用

Question

我有 Spring Boot 应用程序，但无法向用户显示错误消息。没有该数据的对象不会保存在数据库中，这没关系。但显示错误消息是问题所在。调试时出现错误 size = 0

这是我的模型:

 @Size(min = 1, message = "Address is invalid.")
 @NotNull
 @Column
 private String address;

Controller

  @RequestMapping(value = "/create", method = RequestMethod.POST, 
  consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
  public String createNewBusiness(@Valid @ModelAttribute("business") 
  Business business, BindingResult result, Model model) {
  model.addAttribute("userEmail", getUserEmail());
   logger.info("/business/create:" + business.toString());
  LocationResponse locationResponse = geoService.getCoords(business.getAddress());

if(locationResponse.getStatus().equals("OK")) {
    business.setLatitude(locationResponse.getResults().get(0).getGeometry().getLocation().getLat());
    business.setLongitude(locationResponse.getResults().get(0).getGeometry().getLocation().getLng());
    business.setUserId(getUserId());

    businessService.createNew(business);

    model.addAttribute("business", business);

}else{
    business.setAddress(null);
    model.addAttribute("business", business);

}

if(result.hasErrors()){
    List<FieldError> errors = result.getFieldErrors();
    for (FieldError error : errors ) {
        System.out.println (error.getObjectName() + " - " + error.getDefaultMessage());
    }
    return "newBusiness";
}

return "business";

和 thymeleaf

<div class="input-field left m-0 w-100">
                        <i class="fa fa-map-marker prefix grey-text" aria-hidden="true"></i>
                        <input placeholder="Address" id="inputAddress" name="address" type="text" class="validate my-0" th:required="true">
                        <label th:errors="*{address}" th:if="${#fields.hasErrors('address')}" >Invalid address </label>
                    </div>

Answer 1

您需要使用 @Valid 和一些 @ModelAttribute 作为 createNewBusiness() 的参数 - 取决于您的参数和内容.

您还需要将 th:field="*{adress}" 添加到您的输入字段，因为它是该输入字段在框架中的 ID。

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因此在您的情况下，方法 header 将如下所示:

public String createNewBusiness(@ModelAttribute Business business,
    @Valid Model model, BindingResult result) {
    // ...
}