记录下struts2.5下开发第一个程序：
struts2.5基础包选择：
注意：不能选取struts2.5中的 struts2-rest-plugin-2.5.16.jar，会导致莫名错误！
eclipse工具下不能将这些基础包作为用户包导入lib库，会发生加载时找不到主过滤器类org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter。
struts.xml和web.xml的配置
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"
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"
id="WebApp_ID" version="3.0">
<display-name>frameworkStruts</display-name>
<welcome-file-list>
<welcome-file>index</welcome-file>
</welcome-file-list>
<!-- 配置struts核心过滤器 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<!-- 为filter建立映射 -->
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
注意：其中xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance " 原本是这样的。但后面使用标签时提示错误可以加上
http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd
之后不提示错误。
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="basicstruts2" extends="struts-default">
<action name="hello">
<result>hello.jsp</result>
</action>
</package>
</struts>
jsp页面
index.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!-- 使用struts标签库 -->
<%@ 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>Insert title here</title>
</head>
<body>
<h1>welcome to struts2!</h1>
<!-- 定义action的name为hello -->
<p><a href="<s:url action='hello'/>">Hello World</a></p>
</body>
</html>
hello.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Hello Everybody!</h1>
</body>
</html>
至此HelloWorld开发完成！