【Spring学习笔记-MVC-10】Spring MVC之数据校验
作者：ssslinppp
1.准备
这里我们采用Hibernate-validator来进行验证，Hibernate-validator实现了JSR-303验证框架支持注解风格的验证。首先我们要到http://hibernate.org/validator/下载需要的jar包，这里以4.3.1.Final作为演示，解压后把hibernate-validator-4.3.1.Final.jar、jboss-logging-3.1.0.jar、validation-api-1.0.0.GA.jar这三个包添加到项目中。
2. Spring MVC上下文配置
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <!-- 扫描web包，应用Spring的注解 --> <context:component-scan base-package="com.ll.web"/> <!-- 配置视图解析器，将ModelAndView及字符串解析为具体的页面，默认优先级最低 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:viewClass="org.springframework.web.servlet.view.JstlView" p:prefix="/jsp/" p:suffix=".jsp" /> <!-- 设置数据校验、数据转换、数据格式化 --> <mvc:annotation-driven validator="validator" conversion-service="conversionService"/> <!-- 数据转换/数据格式化工厂bean --> <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean" /> <!-- 设置校验工厂bean-采用hibernate实现的校验jar进行校验-并设置国际化资源显示错误信息 --> <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"> <property name="providerClass" value="org.hibernate.validator.HibernateValidator" /> <!--不设置则默认为classpath下的 ValidationMessages.properties --> <property name="validationMessageSource" ref="validatemessageSource" /> </bean> <!-- 设置国际化资源显示错误信息 --> <bean id="validatemessageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource"> <property name="basename"> <list> <value>classpath:valideMessages</value> </list> </property> <property name="fileEncodings" value="utf-8" /> <property name="cacheSeconds" value="120" /> </bean></beans>
3. 待校验的Java对象
package com.ll.model;import java.util.Date;import javax.validation.constraints.DecimalMax;import javax.validation.constraints.DecimalMin;import javax.validation.constraints.Past;import javax.validation.constraints.Pattern;import org.hibernate.validator.constraints.Length;import org.springframework.format.annotation.DateTimeFormat;import org.springframework.format.annotation.NumberFormat;public class Person { @Pattern(regexp="W{4,30}",message="{Pattern.person.username}") private String username; @Pattern(regexp="S{6,30}",message="{Pattern.person.passwd}") private String passwd; @Length(min=2,max=100,message="{Pattern.person.passwd}") private String realName; @Past(message="{Past.person.birthday}") @DateTimeFormat(pattern="yyyy-MM-dd") private Date birthday; @DecimalMin(value="1000.00",message="{DecimalMin.person.salary}") @DecimalMax(value="2500.00",message="{DecimalMax.person.salary}") @NumberFormat(pattern="#,###.##") private long salary; public Person() { super(); } public Person(String username, String passwd, String realName) { super(); this.username = username; this.passwd = passwd; this.realName = realName; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPasswd() { return passwd; } public void setPasswd(String passwd) { this.passwd = passwd; } public String getRealName() { return realName; } public void setRealName(String realName) { this.realName = realName; } public Date getBirthday() {// DateFormat df = new SimpleDateFormat("yyyy-MM-dd");// return df.format(birthday); return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public long getSalary() { return salary; } public void setSalary(long salary) { this.salary = salary; } @Override public String toString() { return "Person [username=" + username + ", passwd=" + passwd + "]"; }}
4. 国际化资源文件
5. 控制层
下面这张图是从其他文章中截取的，主要用于说明：@Valid与BindingResult之间的关系；
package com.ll.web;import java.security.NoSuchAlgorithmException;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 com.ll.model.Person;/** * @author Administrator * */@Controller@RequestMapping(value = "/test")public class TestController { @ModelAttribute("person") public Person initModelAttr() { Person person = new Person(); return person; } /** * 返回主页 * @return */ @RequestMapping(value = "/index.action") public String index() { return "regedit"; } /** * 1. 在入参对象前添加@Valid注解，同时在其后声明一个BindingResult的入参（必须紧随其后）， * 入参可以包含多个BindingResult参数； * 2. 入参对象前添加@Valid注解：请求数据-->入参数据 ===>执行校验； * 3. 这里@Valid在Person对象前声明，只会校验Person p入参，不会校验其他入参; * 4. 概括起来：@Valid与BindingResult必须成对出现，且他们之间不允许声明其他入参； * @param bindingResult ：可判断是否存在错误 */ @RequestMapping(value = "/FormattingTest") public String conversionTest(@Valid @ModelAttribute("person") Person p, BindingResult bindingResult) throws NoSuchAlgorithmException { // 输出信息 System.out.println(p.getUsername() + " " + p.getPasswd() + " " + p.getRealName() + " " + " " + p.getBirthday() + " " + p.getSalary()); // 判断校验结果 if(bindingResult.hasErrors()){ System.out.println("数据校验有误"); return "regedit"; }else { System.out.println("数据校验都正确"); return "success"; } }}
6. 前台
引入Spring的form标签：
在前台显示错误：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %><html><head><title>数据校验</title> <style> .errorClass{color:red} </style></head><body> <form:form modelAttribute="person" action='FormattingTest.action' > <form:errors path="*" cssClass="errorClass" element="div"/> <table> <tr> <td>用户名：</td> <td> <form:errors path="username" cssClass="errorClass" element="div"/> <form:input path="username" /> </td> </tr> <tr> <td>密码：</td> <td> <form:errors path="passwd" cssClass="errorClass" element="div"/> <form:password path="passwd" /> </td> </tr> <tr> <td>真实名：</td> <td> <form:errors path="realName" cssClass="errorClass" element="div"/> <form:input path="realName" /> </td> </tr> <tr> <td>生日：</td> <td> <form:errors path="birthday" cssClass="errorClass" element="div"/> <form:input path="birthday" /> </td> </tr> <tr> <td>工资：</td> <td> <form:errors path="salary" cssClass="errorClass" element="div"/> <form:input path="salary" /> </td> </tr> <tr> <td colspan="2"><input type="submit" name="提交"/></td> </tr> </table> </form:form></body></html>
7. 测试
输入：http://localhost:8080/SpringMVCTest/test/index.action
8. 其他
参考链接：
http://www.cnblogs.com/ssslinppp
http://blog.sina.com.cn/spstudy
http://www.cnblogs.com/liukemng/p/3738055.html
http://www.cnblogs.com/liukemng/p/3754211.html
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