Struts2下载

 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;
     }
 }

struts.xml

 <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>

download.jsp

 <a href="download.action" >下载</a>