springboot实战笔记(十二)----springboot常见表单数据校验
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2022-03-08 17:39:46
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一 创建模拟用户注册项目
pom.xml文件:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.RELEASE</version>
</parent>
<groupId>com.bjsxt</groupId>
<artifactId>13-spring-boot-validate</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<java.version>1.7</java.version>
<thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
<thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.version>
</properties>
<dependencies>
<!-- springBoot的启动器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- thymeleaf的启动器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
</project>
二 创建实体类
package com.bjsxt.pojo;
import javax.validation.constraints.Min;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotBlank;
import org.hibernate.validator.constraints.NotEmpty;
public class Users {
@NotBlank(message="用户名不能为空") //非空校验 判断字符串是否为 null 或者是空串(去掉首尾空格)。
@Length(min=2,max=6,message="最小长度为2位,最大长度为6位")
private String name;
@NotEmpty//非空校验 判断字符串是否 null 或者是空串
private String password;
@Min(value=15)
private Integer age;
@Email(message="邮箱不合法")
private String email;
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Users [name=" + name + ", password=" + password + ", age=" + age + "]";
}
}
三 创建Controller
/**
* SpringBoot 表单数据校验
*
*
*/
@Controller
public class UsersController {
/**
*
* 如果想为传递的对象更改名称,可以使用@ModelAttribute("u")这表示当前传递的对象的key为aa。
* 那么我们在页面中获取该对象的key也需要修改为u
* @param users
* @return
*/
@RequestMapping("/addUser")
public String showPage(@ModelAttribute("u") Users users){
return "add";
}
/**
* 完成用户添加
*@Valid 开启对Users对象的数据校验
*BindingResult:封装了校验的结果
*/
@RequestMapping("/save")
public String saveUser(@ModelAttribute("u") @Valid Users users,BindingResult result){
if(result.hasErrors()){
return "add";
}
System.out.println(users);
return "success";
}
}
四 创建html
add.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加用户</title>
</head>
<body>
<form th:action="@{/save}" method="post">
用户姓名:<input type="text" name="name"/><font color="red" th:errors="${u.name}"></font><br/>
用户密码:<input type="password" name="password" /><font color="red" th:errors="${u.password}"></font><br/>
用户年龄:<input type="text" name="age" /><font color="red" th:errors="${u.age}"></font><br/>
用户邮箱:<input type="text" name="email" /><font color="red" th:errors="${u.email}"></font><br/>
<input type="submit" value="注册"/>
</form>
</body>
</html>
success.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>操作成功</title>
</head>
<body>
注册成功!!!
</body>
</html>
五 创建启动类测试
package com.bjsxt;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
六 总结
错误重现
在测试过程中可能会出现以下错误:
解决办法:
- 将变量名改为类名的首字母小写,例如Users变量名为users
- 利用@ModelAttribute("u")自定义变量