问题描述
Spring boot validation错误信息在Controller中存在，但在渲染页面时无法正常获取
尝试通过println打印，发现controller中错误信息是正常存在的
问题出现的环境背景及自己尝试过哪些方法
Eclipse 2023-03
Spring Boot 2.7.10
相关代码
TestUser.java
@Data
@Entity
@AllArgsConstructor
@NoArgsConstructor(access=AccessLevel.PUBLIC, force=true)
public class TestUser{
@Id
@NotBlank(message = "user is required.")
private String name;
@Email(message = "wrong email format.")
@NotBlank(message = "email is required.")
private String email;
@NotBlank(message = "password is required.")
private String password;
}
TestUserController.java
@Controller
@RequestMapping("/user")
public class TestUserController {
@GetMapping
public String showRegisterForm() {
return "user";
}
@PostMapping
public String register(@Valid TestUser testUser, Errors errors) {
if (errors.hasErrors()) {
return "user";
}
return "redirect:/";
}
@ModelAttribute(name = "testUser")
public TestUser testUser() {
return new TestUser();
}
}
user.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>User</title>
<link rel="stylesheet" th:href="@{/styles.css}" rel="external nofollow" />
</head>
<body>
<form method="POST" th:action="@{/user}" th:object="${testuser}">
<div th:if="${#fields.hasErrors()}">
<span class="validationError">
Something went wrong.
</span>
</div>
<label for="name">Name: </label>
<input type="text" th:field="*{name}" />
<span class="validationError"
th:if="${#fields.hasErrors('name')}"
th:errors="*{name}">Name Error</span>
<br />
<label for="email">Email address: </label>
<input type="text" th:field="*{email}" />
<span class="validationError"
th:if="${#fields.hasErrors('email')}"
th:errors="*{email}">Email Error</span>
<br />
<label for="password">City: </label>
<input type="text" th:field="*{password}"/>
<span class="validationError"
th:if="${#fields.hasErrors('password')}"
th:errors="*{password}">Password Error</span>
<br/>
<input type="submit" value="Submit User"/>
</form>
</body>
</html>
你期待的结果是什么？实际看到的错误信息又是什么？
期待的结果是页面中类型为validationError的span标签正常渲染并在表单页面显示错误信息，但实际看到的情况是页面中这些span标签并没有被渲染
自己检查了半天发现是个很初级的错误，靠打印模型里的值才发现有两个testUser对象，模版里th:object写的是testuser，添加到模型的参数却是testUser，难怪模版找不到要的值了
