springMVC数据校验

 在web应用程序中，为了防止客户端传来的数据引发程序异常，常常需要对 数据进行验证。输入验证分为客户端验证与服务器端验证。客户端验证主要通过JavaScript脚本进行，而服务器端验证则主要通过Java代码进行验证。
   为了保证数据的安全性，一般情况下，客户端和服务器端验证都是必须的

1.导入jar包

SpringMVC支持JSR(Java Specification Result,Java规范提案)303-Bean Validation数据验证规范。而该规范的实现者很多，其中较常用的是Hibernate Validator。需要注意的是，Hibernate Validator是与Hibernate ORM并列的Hibernate的产品之一。这一点从Hibernate官网上所提供的资源形式可以看出他们之间的关系。

hibernate-validator-4.3.1.Final.jar、jboss-logging-3.3.0.jar、validation-api-1.0.0.GA.jar这三个包添加到项目中

2.在applicationContext.xml配置验证器

<?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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
     xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        ">
     
   <!-- 配置包扫描器-->
       <context:component-scan base-package="cn.controller"></context:component-scan>
       
       <!-- 配置验证器 -->
       <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>

3.定义实体类，打注解标记

package cn.entity;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.NotEmpty;

public class UserInfo {
    
     //必须是0到100之间
    @Min(value=0,message="成绩最小值为{value}")
    @Max(value=100,message="成绩最大值为{value}")
    private Integer score;
    
   //手机号码必须不能为空,必须是以1 开头 第二位3,4,5,6,7,8,9   最后9位随意
    @NotEmpty(message="手机号码不允许为空")  
    @Pattern(regexp="^1[3,4,5,6,7,8,9]\\d{9}$",message="手机号码不正确")
  private String phone;
    
    //不能为空
    //必须是6个字符以上
     @NotEmpty(message="用户名不能为空") 
    @Size(min=6,message="名称至少6个字符")
  private String name;
  
    public Integer getScore() {
        return score;
    }
    public void setScore(Integer score) {
        this.score = score;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
  
  
}

4.在我们的处理器类中进行相应的判断处理

package cn.controller;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import cn.entity.UserInfo;

@Controller
public class FirstController {
    @RequestMapping("/first.do")
    public ModelAndView doFirst(@Valid UserInfo info,BindingResult br){
        ModelAndView mv=new ModelAndView();
        mv.setViewName("/welcome.jsp");

        int errorCount = br.getErrorCount();
        if (errorCount>0) {
            FieldError score = br.getFieldError("score");
            FieldError name = br.getFieldError("name");
            FieldError phone = br.getFieldError("phone");
            if (score!=null) {
                mv.addObject("scoremsg",score.getDefaultMessage());
            }
            
            if (name!=null) {
                mv.addObject("namemsg",name.getDefaultMessage());
            }
            
            if (phone!=null) {
                mv.addObject("phonemsg",phone.getDefaultMessage());
            }
            mv.setViewName("/index.jsp");
        }
       
        return mv ;
    }
}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title></title>
    <script type="text/javascript" src="js/jquery-1.8.3.js"></script>
   
  </head>
  
  <body>
    <h1>数据校验</h1>
    <form action="${pageContext.request.contextPath }/first.do" method="post">
                 成绩:<input name="score" /> <span>${scoremsg }</span><br/><br/>
                 姓名:<input name="name"/><span>${namemsg }</span><br/><br/>
               电话:<input name="phone"/><span>${phonemsg }</span><br/><br/>
       <input type="submit" value="注册"/>
    </form>
  </body>
</html>