(Struts2学习系列一)MyEclipse创建第一个struts2项目

　　点击MyEclipse菜单栏File按钮，点击new-->Web Project

　　输入Project name之后点击Finish

　　项目创建完成。

　　然后右键项目，点击MyEclipse-->Project Facets-->Install Apache Struts(2.x) Facets

　　选择Struts2的版本，然后点击finish

　　完成后的项目目录结构如下图所示：

　　创建完之后在src下面可以看到struts.xml

　　在src下创建action包，然后创建HelloWorldAction.java文件，内容如下：

public class HelloWorldAction extends ActionSupport{
    @Override
    public String execute() throws Exception{
        // TODO Auto-generated method stub
        System.out.println("执行Action");
        return "success";
    }
}

　　在src下面的struts.xml中加入代码，效果如下图所示：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <package name="default"  extends="struts-default">
           <action name="helloworld" class="action.HelloWorldAction"> 
               <result name="success">/result.jsp</result>
           </action>
   </package>
</struts>

　　在WebRoot路径下添加result.jsp页面

<%@ 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>result.jsp</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>
    This is result page. <br>
  </body>
</html>

　　web.xml是自动生成的

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>struts2Test2</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>*.action</url-pattern>
  </filter-mapping>
</web-app>

　　将项目部署到tomcat服务器，打开浏览器地址栏输入http://localhost:8080/struts2Demo/helloworld.action即可访问

　　推荐学习视频（struts2入门）：http://www.imooc.com/learn/464