Spring 未在表单（jsp）中显示错误消息

我在表单（jsp表单）中显示错误消息时遇到问题。 我创建了一个验证器，希望看到表单中的错误（如果存在），但是没有显示错误，有什么问题

表格的一部分

<form:form method="POST" action="/regStoreSuccessful" commandName="storeForm">
<table>
  <tr>
    <td><form:label path="name">Store name</form:label></td>
    <td><form:input path="name" /></td>
    <td><form:errors path="name" cssclass="error"/></td>
  </tr>

---

重定向后模型属性将不可用，您应该使用

RedirectAttributes redirectAttrs

并将错误存储为flash属性，这样重定向后属性将可用，使用后立即删除，因此将方法更改为

//post method
@RequestMapping(value = "/regStoreSuccessful", method = RequestMethod.POST)
public ModelAndView addStorePost(@Valid @ModelAttribute("storeForm") Store storeForm, BindingResult bindingResult, Principal principal, , RedirectAttributes redirectAttrs) throws SQLException {
    ModelAndView modelAndView = new ModelAndView("redirect:body");

    if(bindingResult.hasErrors()) {
        redirectAttrs.addFlashAttribute("errors", bindingResult.getAllErrors());
        return new ModelAndView("redirect:regStore");
    }

    storeService.addStore(storeForm);
    return modelAndView;
}

---

这很有效，谢谢你）。我有一个问题，如何在没有重定向的情况下检查有效字段？np，与您的问题有关的是，您只需返回包含表单的页面视图的model和view，这样就不用使用前缀“redirect:”

@Autowired
private StoreValidator storeValidator;

@InitBinder
protected void initBinder(WebDataBinder binder) {
    binder.setValidator(storeValidator);
}

//get method
@RequestMapping(value = "/regStore", method = RequestMethod.GET)
public ModelAndView addStore() throws SQLException {
    ModelAndView modelAndView = new ModelAndView("Store/regStore", "storeForm", new Store());
}

//post method
@RequestMapping(value = "/regStoreSuccessful", method = RequestMethod.POST)
public ModelAndView addStorePost(@Valid @ModelAttribute("storeForm") Store storeForm, BindingResult bindingResult, Principal principal) throws SQLException {
    ModelAndView modelAndView = new ModelAndView("redirect:body");

    if(bindingResult.hasErrors()) {
        modelAndView.addObject("errors", bindingResult.getAllErrors());
        return new ModelAndView("redirect:regStore");
    }

    storeService.addStore(storeForm);
    return modelAndView;
}

//post method
@RequestMapping(value = "/regStoreSuccessful", method = RequestMethod.POST)
public ModelAndView addStorePost(@Valid @ModelAttribute("storeForm") Store storeForm, BindingResult bindingResult, Principal principal, , RedirectAttributes redirectAttrs) throws SQLException {
    ModelAndView modelAndView = new ModelAndView("redirect:body");

    if(bindingResult.hasErrors()) {
        redirectAttrs.addFlashAttribute("errors", bindingResult.getAllErrors());
        return new ModelAndView("redirect:regStore");
    }

    storeService.addStore(storeForm);
    return modelAndView;
}