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private ActionForward doExportPrefixData(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)     {
          String fileName=request.getParameter("fileName"); //页面传来的文件名         String filePath=ServerInfo.getDownloadPath()+fileName;//路径+文件名         try         {
              InputStream in=new FileInputStream(new File(filePath));             BufferedInputStream bfin=new BufferedInputStream(in);             response.setBufferSize(5*1024*1024);//5M大小             response.setContentType("APPLICATION/OCTET-STREAM");             response.setHeader("Content-Disposition","attachment;filename="+fileName);//设置文件头             OutputStream out=response.getOutputStream();             BufferedOutputStream bfout=new BufferedOutputStream(out);             int len=0;             byte[] b=new byte[1024*1024];             while((len=bfin.read(b))!=-1)             {
                  bfout.write(b, 0, len);                 bfout.flush();             }                        bfout.close();             out.close();             bfin.close();             in.close();         }         catch (FileNotFoundException e)         {                        showInfoDialog(response,"文件没找到");         }         catch (IOException e)         {
              showInfoDialog(response,"文件读取失败");         }         return null;     } /**      *      * 方法描述：公用的弹出提示框      * @param response      * @param msg 要提示的消息      */     private void showInfoDialog(HttpServletResponse response,String msg)     {
          try         {
              response.setContentType("text/html;charset=gb2312");             PrintWriter pw=response.getWriter();               pw.print("");                            pw.flush();             pw.close();                    }         catch (IOException e1)         {                            e1.printStackTrace();         }     }

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