javaWeb 实现文件下载的功能

来源：互联网发布：powerdesigner运行sql 编辑：程序博客网时间：2024/06/05 13:27

本文实现文件下载的功能，已经经过项目实践哈

前端只需要向后台controller传递一个要想下载的文件名或文件名的全路径，此处代码是传的文件名

后台controller代码：

@RequestMapping(value = "/downloadQrcode",method = RequestMethod.GET)@ResponseBodypublic void download(HttpServletRequest request,HttpServletResponse response){String Qfile = request.getParameter("Qfile");try{            QRCodeUtil.fileDownLoad(request,response, Qfile);        }catch (IOException e) {            e.printStackTrace();            Log.error(TAG, e.toString());        }      }

public static void fileDownLoad(HttpServletRequest request, HttpServletResponse response, String srcname) throws IOException{        OutputStream os = null;         try {            os = new BufferedOutputStream(response.getOutputStream());            response.reset();            response.setHeader("Content-Disposition", "attachment; filename="+srcname);              response.setContentType("application/octet-stream; charset=utf-8");            String filename = FileConstants.getLocalDir() +"/"+ srcname;//FileConstants.getLocalDir()为服务器上文件的全路径            if(!f.exists()){                //文件不存在                return;            }            os.write(FileUtils.readFileToByteArray(f));              os.flush();          }         finally {              if (os != null) {                  os.close();              }          }}

0 0