Spring4&x2B；Thymeleaf3表单验证：bean name#字段在模板中不可用

当我试图在表单模板中显示验证错误时，我在spring4+TelymeleAF3应用程序中遇到以下错误

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

我的表格如下

<form th:action="@{/user/save}" method="post" th:object="${user}">

<ul th:if="${#fields.hasErrors()}">
   <li th:each="err : ${#fields.errors('*')}" th:text="${err}"></li>
</ul>

<div>
    <label>Name</label>
    <div>
        <input type="text"  th:field="*{firstName}" placeholder="First Name">
        <input type="text" th:field="*{lastName}" placeholder="Last Name">
        <div th:if="${#fields.hasErrors('firstName')}" th:errors="${#fields.errors('firstName')}"></div>
        <div th:if="${#fields.hasErrors('lastName')}" th:errors="${#fields.errors('lastName')}"></div>
    </div>
</div>...

但是当表单与一些无效字段一起提交给下面的方法时，会出现上述错误

 @PostMapping("/save")
public String save(@Valid User user, BindingResult bindingResult, ModelMap model) {
    if(bindingResult.hasErrors()) {
        return VIEW_DIR.concat("form");
    }

    userService.save(user);
    return "redirect:list";
}

---

您能告诉我错误在哪里吗。

您在表单元素div中为th:errors设置了错误的值。th:errors应该包含字段名。使用以下内容更新您的表单：

    <div>
        <input type="text"  th:field="*{firstName}" placeholder="First Name">
        <input type="text" th:field="*{lastName}" placeholder="Last Name">
        <div th:if="${#fields.hasErrors('firstName')}" th:errors="*{firstName}"></div>
        <div th:if="${#fields.hasErrors('lastName')}" th:errors="*{lastName}"></div>
    </div>

    <div>
        <input type="text"  th:field="*{firstName}" placeholder="First Name">
        <input type="text" th:field="*{lastName}" placeholder="Last Name">
        <div th:if="${#fields.hasErrors('firstName')}" th:errors="*{firstName}"></div>
        <div th:if="${#fields.hasErrors('lastName')}" th:errors="*{lastName}"></div>
    </div>