SpringBoot表单验证

清疚 2021-12-10 10:51 272阅读 0赞

SpringBoot的表单验证是通过hibernate-validator.jar的方法实现的  
1.创建maven项目，编写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>1.5.2.RELEASE</version>
    
    	</parent>
    
    	<groupId>per.czt</groupId>
    	<artifactId>13-spring-boot-validate</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>13-spring-boot-validate</name>
    	<url>http://maven.apache.org</url>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<java.version>1.7</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    
    			<scope>test</scope>
    		</dependency>
    
    		
    		<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>
    	</dependencies>
    </project>

2.编写Use类

package per.czt.pojo;
    
    import javax.validation.constraints.Max;
    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 User {
    	@NotBlank(message="name不能为空")//非空校验
    	@Length(min=2,max=6,message="最小长度为2，最大长度为6")
    	private String name;
    	@NotEmpty//不会去掉首尾空格
    	private String password;
    	
    	@Min(value=0)
    	@Max(value=120)
    	private Integer age;
    	@NotBlank(message="邮箱不能为空")
    	@Email
    	private String 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;
    	}
    	public String getEmail() {
    		return email;
    	}
    	public void setEmail(String email) {
    		this.email = email;
    	}
    	
    	@Override
    	public String toString() {
    		return "User [name=" + name + ", password=" + password + ", age=" + age + ", email=" + email + ", getName()="
    				+ getName() + ", getPassword()=" + getPassword() + ", getAge()=" + getAge() + ", getEmail()="
    				+ getEmail() + ", getClass()=" + getClass() + ", hashCode()=" + hashCode() + ", toString()="
    				+ super.toString() + "]";
    	}
    	public User() {
    		super();
    		// TODO Auto-generated constructor stub
    	}
    	
    
    }

@NotBlank:字符串非空检验，去掉两边空字符  
@NotEmpty("):字符串非空检验  
@Length(min=1,max=2) 字符串长度检验  
数字最大值最小值检验  
@Max  
@Min  
邮箱检验  
@Email  
而且可以自己定义错误信息，括号里加message=”“，如@Max(value=1,message=“最小值为空”)  
3.编写UserController

package per.czt.controller;
    
    import javax.validation.Valid;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.validation.BindingResult;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import per.czt.pojo.User;
    
    @Controller
    @RequestMapping("/user")
    
    public class UserController {
    	@RequestMapping("/add")
    	public  String showAddPage(@ModelAttribute("user1") User user) {
    		return "add";
    	}
    	/*
    	 * 
    	 *@Valid:开启对use对象的数据校验
    	 *BingingResult:封装了校验结果
    	 */
    	
    	@RequestMapping("/save")
    	public  String saveUser(@ModelAttribute("user1") @Valid User user,BindingResult result ) {
    		System.out.println(user);
    		System.out.println(result);
    		//如果校验失败
    		if(result.hasErrors())
    		{
    			return "add";
    			
    		}else {//如果校验成功
    			
    			return "ok";
    		}
    		
    	}
    
    
    }

@ModelAttribute如果不自己定义即为类的小写开头如，Users，默认为users，在视图中接收到的就是$\{users\}  
4,编写view层  
add.html

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8"/>
    <title>Insert title here</title>
    </head>
    <body>
    	<form th:action="@{/user/save}" method="post">
    		用户姓名:<input type="text" name="name" /><font th:errors="${user1.name}"></font><br/>
    		用户密码:<input type="password" name="password"/><font th:errors="${user1.password}"></font><br/>
    		用户年龄:<input type="text" name="age" /><font th:errors="${user1.age}"></font><br/>
    		用户邮箱:<input type="text" name="email" /><font th:errors="${user1.email}"></font><br/>
    		<input  type="submit" />
    	</form>
    </body>
    </html>

ok.html

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8"/>
    <title>Insert title here</title>
    </head>
    <body>
    	<span th:text="${user1.name}"></span>
    	<span th:text="${user1.password}"></span>
    	<span th:text="${user1.age}"></span>
    	<span th:text="${user1.email}"></span>
    
    </body>
    </html>