SpringMVC学习笔记七:SpringMVC的数据验证

2022-07-03 17:13:17

SpringMVC支持JSR(Java Specification Requests, Java规范提案)303-Bean Validation数据验证规范,该规范的实现者很多,其中较常用的是

Hibernate Validator

需要加入的包pom.xml

    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->

    <dependency>

        <groupId>org.hibernate</groupId>

        <artifactId>hibernate-validator</artifactId>

        <version>5.2.4.Final</version>

    </dependency>

hibernate-validator-5.2.4.Final.jar

validation-api-1.1.0.Final.jar

jboss-logging-3.2.1.Final.jar

对象实体类Student.java

package com.orange.model;

import javax.validation.constraints.Max;

import javax.validation.constraints.Min;

import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.NotEmpty;

import com.sun.istack.internal.NotNull;

public class Student {

    @NotEmpty(message="姓名不能为空")

    @Size(max=6, min=3, message="姓名长度必须大于{min},小于{max}")

    private String name;

    @NotNull

    @Max(value=100, message="小于100")

    @Min(value=1, message="小于1")

    private int age;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

}

控制器StudentController.java

package com.orange.controller;

import java.util.List;

import org.springframework.stereotype.Controller;

import org.springframework.validation.BindingResult;

import org.springframework.validation.FieldError;

import org.springframework.validation.ObjectError;

import org.springframework.validation.annotation.Validated;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import com.orange.model.Student;

@Controller

@RequestMapping(value="/validator")

public class StudentController {

    @RequestMapping(value="/validator")

    public ModelAndView doTest(@Validated Student student, BindingResult br){

        ModelAndView mav = new ModelAndView();

        List<ObjectError> errors = br.getAllErrors();

        if(errors.size() > 0){

            FieldError nameError =  br.getFieldError("name");

            FieldError ageError = br.getFieldError("age");

            if(nameError != null){

                mav.addObject("nameError", nameError.getDefaultMessage());

            }

            if(ageError != null){

                mav.addObject("ageError", ageError.getDefaultMessage());

            }

            mav.setViewName("/index.jsp");

            return mav;

        }

        mav.addObject("student", student);

        mav.setViewName("/show.jsp");

        return mav;

    }

}

测试的jsp页面index.jsp

<%@ page language="java" contentType="text/html; charset=GBK"

    pageEncoding="GBK"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<base href="<%=basePath %>">

<title>Default Page</title>

</head>

<body>

<form action="validator/validator" method="post">

    name: <input type="text" name="name"><c:out value="${nameError }"></c:out><br>

    age: <input type="text" name="age"><c:out value="${ageError }"></c:out><br>

    <input type="submit" value="submit">

</form>

</body>

</html>

show.jsp

<%@ page language="java" contentType="text/html; charset=GBK"

    pageEncoding="GBK"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<base href="<%=basePath %>">

<title>Default Page</title>

</head>

<body>

<c:out value="${student.name }"></c:out><br>

<c:out value="${student.age }"></c:out>

</body>

</html>

spring-mvc.xml注册验证器

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 扫描注解 -->

    <context:component-scan base-package="com.orange.controller" />    

    <!-- 注册验证器 -->

    <bean id="myValidator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">

        <property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property>

    </bean>

    <mvc:annotation-driven validator="myValidator"/>

</beans>

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