file download

 

        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddhhmmss");
         String fileName = format.format(new Date());

         FileInputStream input = null;
         ServletOutputStream outputStream = null;
         File file = null;
         try {
             file = new File(filePath);
             input = new FileInputStream(file);

             response.setContentType("application/x-download");
             response.setHeader("Content-disposition", "attachment; filename="
                     + fileName + "_workPlan.xls");
             outputStream = response.getOutputStream();

             byte[] b = new byte[1024];
             int i = 0;
             while ((i = input.read(b)) != -1) {
                 outputStream.write(b, 0, i);
             }
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             try {
                 input.close();
                 outputStream.flush();
                 outputStream.close();
                 // 删除临时文件
                 if (file.exists() && file.isFile()) {
                       file.delete();
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }