Springmvc数据校验

步骤一：导入四个jar包

<?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.happy.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>

package cn.happy.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;
import org.jboss.logging.Message;

import com.sun.istack.internal.NotNull;

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;
    }
}

package cn.happy.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.happy.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");
        //记录到底是哪个字段验证失败了
        //有一个可以侦测到验证错误总数的方法
        int errorCount = br.getErrorCount();
        if (errorCount>0) {
            //证明模型验证失败
            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");
        }
        
        //高中  英文版的吻别
        return mv ;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>    
  
  <!-- 编码过滤器 -->
  <filter>
    <filter-name>CharacterEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>


  <!-- 配置中央调度器 -->
  <servlet>
    <servlet-name>springmvc</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </init-param>
    <!-- TOmcat启动的时候，Servlet对象就存储到内存 正整数 -->
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
 
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>