bean 名称 'id' 的 BindingResult 和普通目标对象都不能用作请求属性

Question

我在尝试通过循环迭代添加相关用户时不断收到 "Neither BindingResult nor plain target object for bean name 'id' available as request attribute" 错误。

 @RequestMapping(value = "/user", method = RequestMethod.GET)
public String getUser(HttpServletRequest request, HttpServletResponse response, Model model,  @RequestParam("id") String id, @ModelAttribute("userForm") UserForm userForm)
{
    User user = userService.getUser(id);
    List<User> relateUsers = userService.getRelatedUsers(id);
    userForm.setUser(user);
    userForm.setRelateUsers(relateUsers);
    return userDetailForm;

}



<div class="trackList" th:if="${userForm.relatedUsers.size() > 0}" th:each="relatedUser : ${userForm.relatedUsers}"  >

<th:form method="POST" th:action="@{/user}">                              
              <input type="hidden" id="id" th:field="*{id}"/>
                <div>
              <a class="add"  role="button">Add</a>
                        </div>
</th:form>


</div>

Answer 1

您的示例很奇怪，因为您的处理程序只是映射到 GET 请求。无论如何，您的 POST 处理程序的方法签名对于 BindingResult.

无效

Spring Framework documentation 说：

org.springframework.validation.Errors / org.springframework.validation.BindingResult validation results for a preceding command or form object (the immediately preceding method argument).

您必须将 POST 处理程序的方法签名从类似的东西更改为

@Valid @ModelAttribute("userForm") UserForm userForm, @RequestParam("id") String id

到

@Valid @ModelAttribute("userForm") UserForm userForm, BindingResult result, @RequestParam("id") String id

Answer 2

它帮助我使用以下代码将值绑定到模型属性：

<input type="hidden" th:id="id" th:name="id" th:value="*{id}"/>

bean 名称 'id' 的 BindingResult 和普通目标对象都不能用作请求属性

Neither BindingResult nor plain target object for bean name 'id' available as request attribute

spring-mvc

thymeleaf