struts文件下载

　　//DownloadAction类
 1 package action;
 3 import java.io.BufferedInputStream;
 4 import java.io.File;
 5 import java.io.FileInputStream;
 6 import java.io.FileNotFoundException;
 7 import java.io.InputStream;
 8 
 9 import org.apache.struts2.ServletActionContext;
10 
11 import com.opensymphony.xwork2.Action;
12 
13 public class DownloadAction {
14     // 请求参数
15     private String fileName;
16     // action下载的目录
17     private String inputPath;
18 
19     // 定义get方法，用于获取输入流
20     public InputStream getInputStream() throws FileNotFoundException {
21 
22         String absInputPath = ServletActionContext.getServletContext()
23                 .getRealPath(inputPath);
24         FileInputStream fis = new FileInputStream(absInputPath + File.separator
25                 + fileName);
26         BufferedInputStream bis = new BufferedInputStream(fis);
27         return bis;
28 
29     }
30 
31     public String execute() {
32 
33         return Action.SUCCESS;
34 
35     }
36 
37     public String getFileName() {
38         return fileName;
39     }
40 
41     public void setFileName(String fileName) {
42         this.fileName = fileName;
43     }
44 
45     public String getInputPath() {
46         return inputPath;
47     }
48 
49     public void setInputPath(String inputPath) {
50         this.inputPath = inputPath;
51     }
52 
53 }
　　

//struts.xml
<action name="download" class="action.DownloadAction">
<param name="inputPath">/upload</param>
<result name="success" type="stream">
<param name="contentType">application/octet-stream</param>
<param name="inputName">inputStream</param>
<param name="contentDisposition">
attachment;fileName="${fileName}"
</param>
<param name="bufferSize">4096</param>
</result>
</action>