Struts2 文件下载

 1 package lee;
 2 
 3 import java.io.InputStream;
 4 import org.apache.struts2.ServletActionContext;
 5 import com.opensymphony.xwork2.Action;
 6 import com.opensymphony.xwork2.ActionContext;
 7 import java.util.Map;
 8 /**
 9  * Description:
10  * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> 
11  * <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
12  * <br/>This program is protected by copyright laws.
13  * <br/>Program Name:
14  * <br/>Date:
15  * @author  Yeeku.H.Lee kongyeeku@163.com
16  * @version  1.0
17  */
18 public class AuthorityDownAction implements Action 
19 {
20     private String inputPath;
21     public void setInputPath(String value)
22     {
23         inputPath = value;
24     }
25     public InputStream getTargetFile() throws Exception 
26     {
27         //ServletContext提供getResourceAsStream()方法
28         //返回指定文件对应的输入流 
29         return ServletActionContext.getServletContext()
30             .getResourceAsStream(inputPath);
31     }
32     public String execute() throws Exception
33     {
34         //取得ActionContext实例
35         ActionContext ctx = ActionContext.getContext();
36         //通过ActionContext访问用户的HttpSession
37         Map session = ctx.getSession();
38         String user = (String)session.get("user");
39         //判断Session里的user是否通过检查
40         if ( user !=  null && user.equals("crazyit"))
41         {
42             return SUCCESS;
43         }
44         ctx.put("tip" , 
45             "您还没有登录，或者登录的用户名不正确，请重新登录！");
46         return LOGIN;
47     }
48 }

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 2     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 3 <html xmlns="http://www.w3.org/1999/xhtml">
 4 <head>
 5     <title>Struts 2的文件下载</title>
 6     <meta name="author" content="Yeeku.H.Lee" />
 7     <meta name="website" content="http://www.crazyit.org" />
 8     <meta http-equiv="Content-Type" content="text/html; charset=GBK" />
 9 </head>
10 <body>
11 <h3>Struts 2的文件下载</h3>
12 <ul>
13 <li>下载疯狂Java联盟的Logo：
14     <a href="download.action">下载图形文件</a></li>
15 <li>下载疯狂Java联盟的Logo的压缩文件：
16     <a href="download2.action">下载压缩文件</a></li>
17 </ul>
18 </body>
19 </html>

 1 <?xml version="1.0" encoding="GBK"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
 4     "http://struts.apache.org/dtds/struts-2.1.dtd">    
 5 <struts>
 6 
 7     <constant name="struts.custom.i18n.resources" 
 8         value="globalMessages"/>
 9     <constant name="struts.i18n.encoding" value="GBK"/>
10 
11     <package name="lee" extends="struts-default">
12 
13         <action name="download" class="lee.FileDownloadAction">
14             <!-- 指定被下载资源的位置 -->
15             <param name="inputPath">images疯狂Java联盟.gif</param>
16             <!-- 配置结果类型为stream的结果 -->
17             <result name="success" type="stream">
18                 <!-- 指定下载文件的文件类型 -->
19                 <param name="contentType">image/gif</param>
20                 <!-- 指定由getTargetFile()方法返回被下载文件的InputStream -->
21                 <param name="inputName">targetFile</param>
22                 <param name="contentDisposition">filename="crazyit.gif"</param>
23                 <!-- 指定下载文件的缓冲大小 -->
24                 <param name="bufferSize">4096</param>
25             </result>
26         </action>
27 
28         <action name="download2" class="lee.AuthorityDownAction">
29             <!-- 定义被下载文件的物理资源 -->
30             <param name="inputPath">imagescrazyit.zip</param>
31             <result name="success" type="stream">
32                 <!-- 指定下载文件的文件类型 -->
33                 <param name="contentType">application/zip</param>
34                 <!-- 指定由getTargetFile()方法返回被下载文件的InputStream -->
35                 <param name="inputName">targetFile</param>
36                 <param name="contentDisposition">filename="crazyit.zip"</param>
37                 <!-- 指定下载文件的缓冲大小 -->
38                 <param name="bufferSize">4096</param>
39             </result>
40             <!-- 定义一个名为login的结果 -->
41              <result name="login">/input.jsp</result>
42         </action>
43 
44         <action name="login" class="lee.LoginAction">
45             <result>/stuts2Down.html</result>
46         </action>
47         <action name="">
48             <result>.</result>
49         </action>
50 
51     </package>
52 </struts>