近期学习web开发时，就遇到这个令人头疼的问题。

百度谷歌了N遍，最终在博客http://blog.csdn.net/liu578182160/article/details/17266879中找到了问题的根源。

开发环境：win7 32位旗舰版，jdk1.7_45，jre7，eclipse4.3.1 JavaEE版，tomcat 7.0.42，struts2.3.16.3

问题出如今web.xml配置

原web.xml：

<?xml version="1.0" encoding="UTF-8"?>

<web-app id="struts2Demo" version="2.4"

 xmlns="http://java.sun.com/xml/ns/j2ee"

 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <filter>

        <filter-name>struts2</filter-name>

        <filter-class>

        org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

        </filter-class>

    </filter>

    <filter-mapping>

        <filter-name>struts2</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

</web-app>

改动后的web.xml：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"

    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_3_0.xsd">

  <display-name></display-name>   

   <filter>

     <filter-name>struts2</filter-name>

     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

  </filter>

  <filter-mapping>

     <filter-name>struts2</filter-name>

     <url-pattern>/*</url-pattern>

  </filter-mapping>  

  <welcome-file-list>

    <welcome-file>login.jsp</welcome-file>

  </welcome-file-list>

</web-app>

关键的差别就在于web-app的version

(似乎不关这版本号问题，刚试了2.4的web-app，能够执行成功。)

可能这不是问题的关键，项目改动的地方还有

原login.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'login.jsp' starting page</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--

	<link rel="stylesheet" type="text/css" href="styles.css">

	-->

  </head>

  <body>

    <form action="login.action" method="post"><!-- login就是struts.xml里的action的name -->

   用户名<input type="text" name="username" />  <!-- username相应LoginAction的username通过set方法传入 -->

     密码： <input type="password" name="password" /> <!-- password相应LoginAction的password通过set方法传入 -->

    <input type="submit" name="Submit" value="Submit"/>

    </form>

  </body>

</html>

改动后的login.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@taglib prefix="s" uri="/struts-tags" %>

<!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><s:text name="loginPage"/></title>

</head>

<body>

	<s:form action="login">

		<s:textfield name="username" key="user"/>

		<s:textfield name="password" key="pass"/>

		<s:submit key="login" value="Submit"/>

	</s:form>

</body>

</html>

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