Spring MVC 数据校验
数据校验是每个项目中必不可少的模块，Spring MVC 提供了两种数据校验的组件：
- 基于 Validator 接口进行校验
- 使用 Annotation JSR-303 标准校验
使用基于 Validator 接口进行校验会复杂一些，具体的数据校验的规则需要开发者手动设置。而使用 Annotation JSR-303 标准会相对简单一些，开发者不需要编写校验规则，直接通过注解的形式给每一条数据添加校验规则，具体操作是直接在实体类的属性上添加对应的校验注解即可。
一、基于 Validator 接口
1、创建实体类
import lombok.Data;
@Data
public class Person {
private String name;
private String password;
}
2、自定义数据校验器 PersonValidator，实现 Validator 接口，重写接口的抽象方法，加入校验规则。
public class PersonValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
return Person.class.equals(clazz);
}
@Override
public void validate(Object target, Errors errors) {
ValidationUtils.rejectIfEmpty(errors,"name", null, "姓名不能为空");
ValidationUtils.rejectIfEmpty(errors, "password", null, "密码不能为空");
}
}
3、控制层业务方法
package com.southwind.controller;
import com.southwind.pojo.Person;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/validate")
public class PersonController {
@GetMapping("/login")
public String login(Model model){
model.addAttribute(new Person());
return "login";
}
@PostMapping("/login")
public String login(@Validated Person person, BindingResult bindingResult){
if(bindingResult.hasErrors()){
return "login";
}
return "success";
}
}
4、springmvc.xml 配置 Validator
<bean id="personValidator" class="com.southwind.validator.PersonValidator">bean>
<mvc:annotation-driven validator="personValidator">mvc:annotation-driven>
5、login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<h1>用户登录h1>
<form:form modelAttribute="person" action="/validate/login" method="post">
姓名：<form:input path="name">form:input><form:errors path="name">form:errors><br>
密码：<form:input path="password">form:input><form:errors path="password">form:errors><br>
<input type="submit" value="提交">
form:form>
body>
html>
success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<h1>successh1>
body>
html>
6、页面效果
7、处理流程
二、Annotation JSR-303 标准
Hibernate Validator，通过注解完成校验规则的绑定。
- @Null 只能为 null
- @NotNull 不能为 null
- @Size 设置数据长度
- @NotEmpty 不能为空
1、pom.xml
<dependency>
<groupId>org.hibernategroupId>
<artifactId>hibernate-validatorartifactId>
<version>5.3.6.Finalversion>
dependency>
<dependency>
<groupId>javax.validationgroupId>
<artifactId>validation-apiartifactId>
<version>2.0.1.Finalversion>
dependency>
<dependency>
<groupId>org.jboss.logginggroupId>
<artifactId>jboss-loggingartifactId>
<version>3.4.1.Finalversion>
dependency>
2、创建实体类，通过注解的方式给属性指定校验规则
import lombok.Data;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;
@Data
public class Account {
@NotEmpty(message = "用户名不能为空")
private String username;
@Size(min = 6, max = 20,message = "密码长度为6-20位")
private String password;
@Email(regexp = "^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+(\\\\\\\\.[a-zA-Z0-9-]+)*\\\\\\\\.[a-zA-Z0-9]{2,6}$",message = "请输入正确的邮箱")
private String email;
@Pattern(regexp = "^1(3\\d|4[5-8]|5[0-35-9]|6[567]|7[01345-8]|8\\d|9[025-9])\\d{8}$", message ="请输入正确的电话格式")
private String phone;
}
3、业务方法
import com.southwind.pojo.Account;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.validation.Valid;
@Controller
@RequestMapping("/account")
public class RegisterController {
@GetMapping("/register")
public String register(Model model){
model.addAttribute(new Account());
return "register";
}
@PostMapping("/register")
public String register(@Valid Account account, BindingResult bindingResult){
if(bindingResult.hasErrors()){
return "register";
}
return "success";
}
}
4、springmvc.xml
<mvc:annotation-driven>mvc:annotation-driven>
5、register.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<h1>用户注册h1>
<form:form action="/account/register" modelAttribute="account" method="post">
用户名：<form:input path="username">form:input><form:errors path="username">form:errors><br>
密码：<form:input path="password">form:input><form:errors path="password">form:errors><br>
邮箱：<form:input path="email">form:input><form:errors path="email">form:errors><br>
电话：<form:input path="phone">form:input><form:errors path="phone">form:errors><br>
<input type="submit" value="提交">
form:form>
body>
html>