struts2基础代码实现

结构图：

load.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'load.jsp' starting page</title>
13     
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22 
23   </head>
24   <body>
25 <h1>Struts2 入门案例</h1>
26 <!-- 连接中放置要使用的Action -->
27 <a href="${pageContext.request.contextPath}/StrutsDemo1">访问Struts2的Action. </a>
28   </body>
29 </html>
30

web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
 3 <display-name>struts2</display-name>
 4   
 5   <!-- 配置Struts2的核心过滤器：前端控制器 -->
 6   <filter>
 7       <filter-name>struts2</filter-name>
 8       <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
 9   
10     <!-- 通过init-param 元素配置 默认编码 -->
11     <init-param>
12     <param-name>struts.iln8.encoding</param-name>
13     <param-value>UTF-8</param-value>
14     </init-param>
15  
16   </filter>
17   <filter-mapping>
18       <filter-name>struts2</filter-name>
19       <url-pattern>/*</url-pattern>
20   </filter-mapping>
21   
22   <welcome-file-list>
23     <welcome-file>demo1/load.jsp</welcome-file>
24   </welcome-file-list>
25 </web-app>

StrutsDemo1

 1 package cn.itcast.struts2.action;
 2 
 3 import com.opensymphony.xwork2.ActionSupport;
 4 
 5 public class StrutsDemo1 extends ActionSupport {
 6 
 7     @Override
 8     public String execute() throws Exception {
 9         /**
10          * 提供一个默认的执行方法execute
11          * 通常实现信息查询来编写是否登录等逻辑返回不同的字符串
12          */
13         System.out.println("StrutsDemo1 中的execute执行了");
14         return "success";
15     }
16 
17 }

struts.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC 
 3 "-//Apache Software Foundation//DTD Struts Configuration2.0//EN"
 4 "http://struts.apache.org/dtds/struts-2.0.dtd">
 5 <struts>
 6     <!-- 配置一个包package -->
 7     <package name="demo1" extends="struts-default">
 8     <!-- 配置Action -->
 9     <action name="StrutsDemo1" class="cn.itcast.struts2.action.StrutsDemo1">
10    <!-- 配置结果页面的跳转 在Action 中根据不同的返回值配置不同的跳转页面 -->
11    <result name="success">/demo1/main.jsp</result>
12     </action>    
13     </package>
14 </struts>

main.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'main.jsp' starting page</title>
13     
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22   </head>
23       跳转成功！！
24   <body>
25   
26   
27   </body>
28 </html>