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>

步骤二：配置验证器

 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;
     }
 }

步骤三：为实体类进行注解约束

 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 ;
     }
 }

步骤四：编写Handler控制器

<?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>

web.xml