使用Google App Engine Blobstore下载的文件名 [英] Downloaded filename with Google App Engine Blobstore

问题描述

我使用Google App Engine Blobstore来存储一系列文件类型（PDF，XLS等），并试图找到一种机制，通过这种机制，上传文件的原始文件名（存储在blob_info中）可以用于命名下载的文件，即让用户在保存对话框中看到'some_file.pdf'而不是'very_long_db_key.pdf'。

我什么都看不到在允许的文档中：

http://code.google.com/appengine/docs/python/blobstore/overview.html

我在其他帖子中看到过提示您可以使用blob_info中的信息来设置内容处置标题。这是达到理想目的的最佳方法吗？

解决方案

send_blob函数中有一个可选的'save_as'参数。默认情况下，它被设置为False。将其设置为True将导致文件被视为附件（即它会触发'保存/打开'下载对话框），用户将看到正确的文件名。

<例如：

pre code> class ServeHandler（blobstore_handlers.BlobstoreDownloadHandler）：
def get（self，resource）：
resource = str（urllib.unquote（资源））
blob_info = blobstore.BlobInfo.get（资源）
self.send_blob（blob_info，save_as = True）

也可以通过传入字符串覆盖文件名：

  self.send_blob（blob_info，save_as ='my_file.txt'）
  

如果您希望打开某些内容（如pdf）而不是保存，则可以使用content_type来确定行为：

  blob_info = blobstore.BlobInfo.get（资源）
类型= blob_info.content_type 
如果输入=='application / pdf'：
 self.response .headers ['Content-Type'] =类型
 self.send_blob（blob_info，save_as = False）
 else：
 self.send_blob（blob_info，save_as = True）
  

I'm using the Google App Engine Blobstore to store a range of file types (PDF, XLS, etc) and am trying to find a mechanism by which the original filename of the uploaded file - as stored in blob_info - can be used to name the downloaded file i.e. so that the user sees 'some_file.pdf' in the save dialogue rather than 'very_long_db_key.pdf'.

I can't see anything in the docs that would allow this:

http://code.google.com/appengine/docs/python/blobstore/overview.html

I've seen hints in other posts that you could use the information in blob_info to set the content-disposition header. Is this the best approach to achieving the desired end?

解决方案

There is an optional 'save_as' parameter in the send_blob function. By default this is set to False. Setting it to True will cause the file to be treated as an attachment (ie it will trigger a 'Save/Open' download dialog) and the user will see the proper filename.

Example:

class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler):
    def get(self, resource):
        resource = str(urllib.unquote(resource))
        blob_info = blobstore.BlobInfo.get(resource)
        self.send_blob(blob_info,save_as=True)

It is also possible to overwrite the filename by passing in a string:

self.send_blob(blob_info,save_as='my_file.txt')

If you want some content (such as pdfs) to open rather than save you could use the content_type to determine the behavior:

blob_info = blobstore.BlobInfo.get(resource)
type = blob_info.content_type
if type == 'application/pdf':       
    self.response.headers['Content-Type'] = type
    self.send_blob(blob_info,save_as=False)
else:
    self.send_blob(blob_info,save_as=True)

这篇关于使用Google App Engine Blobstore下载的文件名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！