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解决struts2中validation.xml配置无效的问题

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=http://www.mamicode.com/"true" />>


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




解决struts2中validation.xml配置无效的问题