package com.tcf.action;

 import java.io.BufferedInputStream;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.InputStream;

 import com.opensymphony.xwork2.ActionSupport;

 public class DownLoadAction extends ActionSupport {

     private String inputPath;

     private String fileName;

     private InputStream  inputStream;

     private String contentType;

     public String getInputPath() {

         return inputPath;

     }

     public void setInputPath(String inputPath) {

         this.inputPath = inputPath;

     }

     public String getFileName() {

         return fileName;

     }

     public void setFileName(String fileName) {

         this.fileName = fileName;

     }

     public String getContentType() {

         return contentType;

     }

     public InputStream getInputStream() {

         return inputStream;

     }

     public void setInputStream(InputStream inputStream) {

         this.inputStream = inputStream;

     }

     public void setContentType(String contentType) {

         this.contentType = contentType;

     }

     public String execute(){

         try {

             this.inputStream = new BufferedInputStream(new FileInputStream(inputPath+"/"+fileName));

         } catch (FileNotFoundException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         }

         return SUCCESS;

     }

 }

 <action name="download" class="com.tcf.action.DownLoadAction">

     <param name="inputPath">E:/temp</param>

     <param name="fileName">back.gif</param>

     <result type="stream">

         <param name="contentType">image/gif</param>

         <param name="inputName">inputStream</param>

         <!-- 附件 -->

         <param name="contentDisposition">

                 attachment;filename="${fileName}"

         </param>

         <param name="bufferSize">4096</param>

     </result>

 </action>

 <a href="download.action" >下载</a>