解决struts2中validation.xml配置无效的问题

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解决struts2中validation.xml配置无效的问题，我使用了xml的验证，却始终发现无法生效，后面发现才是xml的头文件的格式问题，修改了一下就好了。

成功的xml

<!DOCTYPE validators PUBLIC        "-//Apache Struts//XWork Validator 1.0.2//EN"        "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd"><validators>  <field name="username">      <field-validator type="requiredstring">          <message>You must enter a value for bar.</message>      </field-validator>  </field></validators>

主要是<!DOCTYPE validators PUBLIC
"-//Apache Struts//XWork Validator 1.0.2//EN"
"http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">

这句话的格式要正确，否则就无法生效了。

如何利用validation.xml进行验证的步骤如下：

1、写一个ValideAction.java，也就是处理业务逻辑的类

package com.test.action;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;import com.test.model.Contact;import com.test.model.User;public class ValideAction extends ActionSupport implements ModelDriven<User>{/** *  */private static final long serialVersionUID = 1L;private User user;private String username;private Contact contact;public Contact getContact() {return contact;}public void setContact(Contact contact) {this.contact = contact;}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;}private String password;public String execute(){//System.out.println(user.getContact().getPhone());return SUCCESS;}@Overridepublic User getModel() {// TODO Auto-generated method stubif (null == user) {   return user = new User();  }  return user;}}

2、编写一个验证文件，ValideAction-validation.xml

<!DOCTYPE validators PUBLIC        "-//Apache Struts//XWork Validator 1.0.2//EN"        "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd"><validators>  <field name="username">      <field-validator type="requiredstring">          <message>You must enter a value for bar.</message>      </field-validator>  </field></validators>

3、对应的JSP页面，注意，我这里只用了一个username作为测试判断的例子，其他字段例如password没有用来测试。

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib uri="/struts-tags" prefix="s"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><!-- 这个地方是用来显示错误信息 --><s:fielderror/><form action="data.action" method="post">用户名：<input type="text" name="username"><br>密码：<input type="password" name="password"><br>-------------------联系方式----------------<br>手机：<input type="text" name="contact.phone"><br>地址：<input type="text" name="contact.address"><br>邮箱：<input type="text" name="contact.email"><br><input type="submit" name="ok"><br></form></body></html>

4、struts.xml中配置action

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts>      <!--   采用注解的方式 -->    <constant name="struts.enable.DynamicMethodInvocation" value="true" />    <constant name="struts.devMode" value="true" />     <package name="default" namespace="" extends="struts-default">    <!-- 正确和错误的分别跳转，input是在验证失败后会跳转的页面 -->    <action name="data" class="com.test.action.ValideAction">          <result name="success">/result.jsp</result>        <result name="input">/login.jsp</result>    </action>    </package>       <!-- Add packages here --></struts>

5、最终显示JSP页面就是上面那个文件，主要用<s:fielderror/>来显示错误信息

6、文件目录结构

输出结果

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