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;
}
@Override
public User getModel() {
// TODO Auto-generated method stub
if (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
时间： 2024-10-09 23:36:23