SpringMvc文件下载

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/**   * 文件下载   * @Description:   * @param fileName   * @param request   * @param response   * @return   */   @RequestMapping("/download")   public String downloadFile(@RequestParam("fileName") String fileName,           HttpServletRequest request, HttpServletResponse response) {       if (fileName != null) {           String realPath = request.getServletContext().getRealPath(                     "WEB-INF/File/");           File file = new File(realPath, fileName);           if (file.exists()) {               response.setContentType("application/force-download");// 设置强制下载不打开               response.addHeader("Content-Disposition",                         "attachment;fileName=" + fileName);// 设置文件名               byte[] buffer = new byte[1024];               FileInputStream fis = null;               BufferedInputStream bis = null;               try {                   fis = new FileInputStream(file);                   bis = new BufferedInputStream(fis);                   OutputStream os = response.getOutputStream();                   int i = bis.read(buffer);                   while (i != -1) {                       os.write(buffer, 0, i);                       i = bis.read(buffer);                   }               } catch (Exception e) {                   // TODO: handle exception                   e.printStackTrace();               } finally {                   if (bis != null) {                       try {                           bis.close();                       } catch (IOException e) {                           // TODO Auto-generated catch block                           e.printStackTrace();                       }                   }                   if (fis != null) {                       try {                           fis.close();                       } catch (IOException e) {                           // TODO Auto-generated catch block                           e.printStackTrace();                       }                   }               }           }       }       return null;   }