【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。

[/b]2. Spring MVC上下文配置[/b]

<?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[/code] 
http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.0.xsd[/code] 
http://www.springframework.org/schema/mvc[/code] 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">[/code] 

<!-- 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>

[/code]
3. 待校验的Java对象[/b]



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 + "]";

}

}

[/code]
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";

}

}


}

[/code]
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>

[/code]
7. 测试
输入：http://localhost:8080/SpringMVCTest/test/index.action 





8. 其他[/b]
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 淘宝源程序下载（可直接运行）：http://shop110473970.taobao.com/?spm=a230r.7195193.1997079397.42.AvYpGW http://shop125186102.taobao.com/?spm=a1z10.1-c.0.0.SsuajD

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