python实现上传下载文件功能

@csrf_exempt
@require_http_methods(["POST"])
def uploadFiles(request):
 try:
 user = request.session.get('user')
 allFimeNames = ""
 #获取所有上传文件
 files = request.FILES.getlist("file")
 for file in files:
  # 获取文件名 解析文件后缀 获取新文件名
  oldName = file.name
  filename = str(int(time.time() * 10))+"."+oldName.split(".")[1]
  now = datetime.now()
  filePath = os.path.join("developmentTask",str(user.get("userId"))+"-"+now.strftime('%Y-%m-%d'))
  dirpath = os.path.join(settings.UPLOADFILES_DIRS , filePath)
  #写入服务器
  if not os.path.exists(dirpath):
  os.makedirs(dirpath)
  newFilePath = os.path.join(dirpath, filename)
  with open(newFilePath, 'wb+') as destination:
  for chunk in file.chunks():
   destination.write(chunk)
  #返回新文件名 多个用逗号隔开
  allFimeNames = os.path.join(filePath,filename)
 except Exception:
 return JsonResponse(data={'error': "系统异常"}, status=400)
 return JsonResponse(data={'filePath': allFimeNames})

@csrf_exempt
@require_http_methods(["GET"])
def downloadFile(request):
 filePath = request.GET.get("filepath")
 fileName = request.GET.get("filename")
 file_name = os.path.join(settings.UPLOADFILES_DIRS, filePath)
 if os.path.exists(file_name):
 def file_iterator(file_name, chunk_size=512):
  with open(file_name) as f:
  while True:
   c = f.read(chunk_size)
   if c:
   yield c
   else:
   break
 response = StreamingHttpResponse(file_iterator(file_name))
 response['Content-Type'] = 'application/octet-stream'
 response['Content-Disposition'] = 'attachment;filename="{0}"'.format(fileName)
 return response
 response = StreamingHttpResponse("文件不存在！")
 response['Content-Type'] = 'application/octet-stream'
 response['Content-Disposition'] = 'attachment;filename="{0}"'.format("")
 return response