Spring Boot 2 Thymeleaf服务器端表单验证实现详解
这篇文章主要介绍了Spring Boot 2 Thymeleaf服务器端表单验证实现详解,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
表单验证分为前端验证和服务器端验证。
服务器端验证方面,Java提供了主要用于数据验证的JSR 303规范,而Hibernate Validator实现了JSR 303规范。
项目依赖加入spring-boot-starter-thymeleaf时,默认就会加入Hibernate Validator的依赖。
开发环境:IntelliJ IDEA 2019.2.2
Spring Boot版本:2.1.8
新建一个名称为demo的Spring Boot项目。
1、pom.xml
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency>
2、src/main/java/com/example/demo/User.java
package com.example.demo; import org.hibernate.validator.constraints.Length; import javax.validation.constraints.NotBlank; import javax.validation.constraints.Size; public class User { @NotBlank(message = "用户名不能为空") String name; @Length(min = 11, max = 11, message = "手机号长度必须11位") String phone; @Size(min = 6, max = 20, message = "密码长度6-20位") String password; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
3、src/main/java/com/example/demo/FormController.java
package com.example.demo; import org.springframework.stereotype.Controller; import org.springframework.validation.BindingResult; import org.springframework.validation.ObjectError; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import javax.validation.Valid; import java.util.List; @Controller public class FormController { @RequestMapping("/{form}") public String form(@PathVariable String form, @ModelAttribute User user){ return form; } @PostMapping("/submit") public String submit(@Valid User user, BindingResult result){ if (result.hasErrors()) { List<ObjectError> list = result.getAllErrors(); for (ObjectError error : list) { System.out.println(error.getDefaultMessage()); } return "form"; } //业务逻辑处理 return "form"; } }
4、src/main/resources/templates/form.html
前端通过#fields对象输出错误信息有2种方式,1种是在每个字段后面输出,另1种是全部在一起输出。
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>表单的提交处理</title> <style> .fieldError{color: red} </style> </head> <body> <form method="post" th:action="@{/submit}" th:object="${user}"> <table> <tr> <td>用户名:</td> <td><input type="text" th:field="*{name}" /> <span class="fieldError" th:if="${#fields.hasErrors('*{name}')}" th:errors="*{name}"></span> </td> </tr> <tr> <td>手机号:</td> <td><input type="text" th:field="*{phone}" /> <span class="fieldError" th:if="${#fields.hasErrors('*{phone}')}" th:errors="*{phone}"></span> </td> </tr> <tr> <td>密码:</td> <td><input type="text" th:field="*{password}" /> <span class="fieldError" th:if="${#fields.hasErrors('*{password}')}" th:errors="*{password}"></span> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="提交" /> <div th:each="err : ${#fields.errors('*')}"> <span th:text="${err}" class="fieldError"></span> </div> </td> </tr> </table> </form> </body> </html>
启动服务后,浏览器访问http://localhost:8080/form,点击提交按钮,结果如下:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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