第二章 第一个Struts应用
WEB-INF/web.xml配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
src/struts.xml 配置：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="itcast" namespace="/test" extends="struts-default">
<action name="helloworld" class="cn.itcast.action.HelloWorldAction" method="execute" >
<result name="success">/WEB-INF/page/hello.jsp</result>
</action>
</package>
</struts>
package name属性随意，多个包名不可重复，用来给其他包继承
package namespace 访问路径，访问action时路径http://localhost:8080/struts2/test/helloWorld
package extends 继承struts-default
action name 随意，action的名字
action class action的执行类路径
action method 执行方法
result name 视图导航，根据action执行类返回值匹配name跳转视图
包：
cn.itcast.action;
-----HelloWorldAction.java
package cn.itcast.action;
public class HelloWorldAction {
private String msg;
public String getMessage() {
return msg;
}
public String execute(){
msg = "我的第一个struts2应用";
return "success";
}
}
WEB-INF/page/hello.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'hello.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>
${message }
</body>
</html>
浏览器中访问：http://localhost:8080/struts2/test/helloWorld