聊点Python：在Django中利用zipfile，StringIO等库生成下载的文件​

>>> import zipfile
>>> import StringIO
>>> buffer= StringIO.StringIO()
>>> z= zipfile.ZipFile( buffer, "w" )
>>> z.write( "idletest" )
>>> z.close()
>>> len(buffer.getvalue())
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from django.http import HttpResponse
from wsgiref.util import FileWrapper


# generate the file
response = HttpResponse(FileWrapper(myfile.getvalue()), content_type='application/zip')
response['Content-Disposition'] = 'attachment; filename=myfile.zip'
return response
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from django.http import StreamingHttpResponse
def big_file_download(request):
  # do something...
  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


  the_file_name = "big_file.pdf"
  response = StreamingHttpResponse(file_iterator(the_file_name))
  response['Content-Type'] = 'application/octet-stream'
  response['Content-Disposition'] = 'attachment;filename="{0}"'.format(the_file_name)
  return response
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class ZipUtilities(object):
    """
    打包文件成zip格式的工具类


    使用方式


    >>> utilities = ZipUtilities()
    >>> for file_obj in file_objs:
    >>>    tmp_dl_path = os.path.join(path_to, filename)
    >>> utilities.to_zip(tmp_dl_path, filename)
    >>> utilities.close()
    >>> response = StreamingHttpResponse(utilities.zip_file, content_type='application/zip')
    >>> response['Content-Disposition'] = 'attachment;filename="{0}"'.format("下载.zip")
    """
    zip_file = None


    def __init__(self):
        self.zip_file = zipstream.ZipFile(mode='w', compression=zipstream.ZIP_DEFLATED)


    def to_zip(self, file, name):
        if os.path.isfile(file):
            self.zip_file.write(file, arcname=os.path.basename(file))
        else:
            self.add_folder_to_zip(file, name)


    def add_folder_to_zip(self, folder, name):
        for file in os.listdir(folder):
            full_path = os.path.join(folder, file)
            if os.path.isfile(full_path):
                self.zip_file.write(full_path, arcname=os.path.join(name, os.path.basename(full_path)))
            elif os.path.isdir(full_path):
                self.add_folder_to_zip(full_path, os.path.join(name, os.path.basename(full_path)))


    def close(self):
        if self.zip_file:
            self.zip_file.close()
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