struts中实现文件下载

struts中实现文件下载的主要代码：

public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  String strFileName = "测试文件.rar";
  File file = new File("具体路径" + strFileName);//
  if(file.exists()){
   try{
    BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
    byte[] buffer = new byte[1024];
    strFileName = java.net.URLEncoder.encode(strFileName, "UTF-8");//处理中文文件名的问题
    strFileName = new String(strFileName.getBytes("UTF-8"),"GBK");//处理中文文件名的问题
    response.reset();
    response.setCharacterEncoding("UTF-8");
    response.setContentType("application/x-rar-compressed");//不同类型的文件对应不同的MIME类型
    response.setHeader("Content-Disposition","attachment; filename=" + strFileName);
    OutputStream os = response.getOutputStream();
    while(bis.read(buffer) > 0){
     os.write(buffer);
    }
    bis.close();
    os.close();
   }
   catch(Exception e){
    ......
   }
  }
  return mapping.getInputForward();
 }

在Struts中的实现和在ASP.NET的实现类似，这段代码就是将服务器上的文件以流的方式发送到客户端浏览器，如果要是在线打开的方式的话还应将response.setHeader("Content-Disposition","attachment; filename=" + strFileName);改写为response.setHeader("Content-Disposition","inline; filename=" + strFileName);