用Spring MVC表单验证

web.xml

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xmlns="http://java.sun.com/xml/ns/javaee"        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"        version="3.0"><listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <context-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:spring.xml,classpath:spring-validate.xml</param-value>  </context-param>  <!-- POST中文乱码过滤器 -->  <filter>    <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>  <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:spring-mvc.xml</param-value>    </init-param>    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>SpringMVC</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping></web-app>

spring-mvc.xml

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.0.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">    <!-- 若想使用验证框架，必须使用自动注册ioc机制 -->    <context:component-scan base-package="com.lyf.controller" />    <mvc:annotation-driven />    <bean        class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="viewClass"            value="org.springframework.web.servlet.view.JstlView" />        <property name="prefix" value="/WEB-INF/jsp/" />        <property name="suffix" value=".jsp" />    </bean></beans>

spring-validate.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd">    <!-- validationMessageSource属性：指定国际化错误消息从哪里取，    此处使用之前定义的messageSource来获取国际化消息    ；如果此处不指定该属性，         则默认到classpath下的ValidationMessages.properties取国际化错误消息。 -->    <bean id="validator"        class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">        <property name="providerClass" value="org.hibernate.validator.HibernateValidator" />        <!-- 如果不加默认到 使用classpath下的 ValidationMessages.properties -->        <property name="validationMessageSource" ref="messageSource" />    </bean>    <bean id="messageSource"        class="org.springframework.context.support.ReloadableResourceBundleMessageSource">        <!-- 以发布到服务器的路径为准-->        <property name="basename" value="classpath:messages" />        <property name="fileEncodings" value="utf-8" />        <property name="cacheSeconds" value="120" />    </bean></beans>

spring.xml

s<?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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd          http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd                 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd         http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">    <mvc:default-servlet-handler/><!-- 只针对静态页，jsp可不用 --></beans>

messages.properties

NotEmpty.userModel.userName=用户名不能为空.NotNull.userModel.age=年龄不能为空NotEmpty.userModel.password=密码不能为空NotEmpty.userModel.xm=真实姓名不能为空Pattern.userModel.age=必须数字Range.userModel.age=超范围了

UserModel

package com.lyf.po;import org.hibernate.validator.constraints.NotEmpty;import org.hibernate.validator.constraints.Range;import javax.validation.constraints.Pattern;/** * Created by fangjiejie on 2017/6/6. */public class UserModel {    @NotEmpty    private String username;    @NotEmpty    private String password;    @NotEmpty    @Pattern(regexp = "^\\d+$")    @Range(min=0,max = 99)    private String age;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }}

ValidateController

package com.lyf.controller;import com.lyf.po.UserModel;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.validation.BindingResult;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import javax.validation.Valid;import java.util.Map;/** * Created by fangjiejie on 2017/6/6. */@Controller@RequestMapping("/validate")public class ValidateController {    //1.spring-mvc配置必须使用自动注解形式，否则不好使    //2.视图层必须使用spring控件，否则不好使    //3.以下语句必须首先实例化个空对象，并且装在model中，否则出现找不到属性错误    //键的名字是"userModel",且值是vo的类名，首字母小写，契约式编程    //4.视图层中必须有commandName："userModel",且值是vo的类名，首字母小写，契约式编程    @RequestMapping("/show")    public String showForm(Map map){        UserModel user=new UserModel();        map.put("user",user);        return "validationform";    }   @RequestMapping("/val")        public String validate(@Valid @ModelAttribute("user") UserModel user, BindingResult result, Model model){     if(result.hasErrors()){         return "validationform";     }else{         return "validationsuccess";     }    }}

index.jsp

<%--  Created by IntelliJ IDEA.  User: fangjiejie  Date: 2017/6/6  Time: 16:43  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head>    <title>Title</title></head><body><a href="/validate/show">表单验证</a></body></html>

validationform.jsp

<%--  Created by IntelliJ IDEA.  User: fangjiejie  Date: 2017/6/6  Time: 16:43  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %><html><head>    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">    <title>Title</title></head><body><!-- 必须使用Spring的组件 --><form:form method="post" action="/validate/val" commandName="user">    <h4 align="center"><u>登录页</u></h4>    <table align="center">        <tr>            <td>用户名:</td>            <td><form:input path="username" /><font color="red">                <form:errors    path="username" /></font></td>        </tr>        <tr>            <td>年龄:</td>            <td><input type="number" name="age" value="10" ><font color="red">                <form:errors path="age" /></font></td>        </tr>        <tr>            <td>密码:</td>            <td><form:password path="password" /><font color="red">                <form:errors     path="password" /></font>            </td>        </tr>        <tr>        <tr>            <td></td>            <td><input type="submit" value="Submit" /></td>        </tr>    </table></form:form></body></html>

validationsuccess.jsp

<%--  Created by IntelliJ IDEA.  User: fangjiejie  Date: 2017/6/6  Time: 16:54  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head>    <title>Title</title></head><body><h2>注册成功！</h2></body></html>