上传Google App Engine中的文件 [英] Upload files in Google App Engine
问题描述
我打算创建一个Web应用程序，允许用户降级他们的Visual Studio项目文件。但是，Google App Engine似乎通过 db.TextProperty 和 db.BlobProperty 接受了Google Server上的文件上传和平面文件存储c>。
I am planning to create a web app that allows users to downgrade their visual studio project files. However, It seems Google App Engine accepts files uploading and flat file storing on the Google Server through db.TextProperty and db.BlobProperty.
我很高兴任何人都可以提供代码示例（客户端和服务器端），以了解如何完成这项工作。
I'll be glad anyone can provide code sample (both the client and the server side) on how this can be done.
推荐答案
这是一个完整的工作文件。我从Google网站上下载了原创内容，并对其进行了修改，使其更加真实。
Here is a complete, working file. I pulled the original from the Google site and modified it to make it slightly more real world.
需要注意的几件事：
- This code uses the BlobStore API
The purpose of this line in the ServeHandler class is to "fix" the key so that it gets rid of any name mangling that may have occurred in the browser (I didn't observe any in Chrome)
blob_key = str(urllib.unquote(blob_key))
在此结束时很重要。它将确保文件名在发送到浏览器时不会受到损坏。
The "save_as" clause at the end of this is important. It will make sure that the file name does not get mangled when it is sent to your browser. Get rid of it to observe what happens.
self.send_blob(blobstore.BlobInfo.get(blob_key), save_as=True)
祝您好运！
import os
import urllib
from google.appengine.ext import blobstore
from google.appengine.ext import webapp
from google.appengine.ext.webapp import blobstore_handlers
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app
class MainHandler(webapp.RequestHandler):
def get(self):
upload_url = blobstore.create_upload_url('/upload')
self.response.out.write('<html><body>')
self.response.out.write('<form action="%s" method="POST" enctype="multipart/form-data">' % upload_url)
self.response.out.write("""Upload File: <input type="file" name="file"><br> <input type="submit" name="submit" value="Submit"> </form></body></html>""")
for b in blobstore.BlobInfo.all():
self.response.out.write('<li><a href="/serve/%s' % str(b.key()) + '">' + str(b.filename) + '</a>')
class UploadHandler(blobstore_handlers.BlobstoreUploadHandler):
def post(self):
upload_files = self.get_uploads('file')
blob_info = upload_files[0]
self.redirect('/')
class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler):
def get(self, blob_key):
blob_key = str(urllib.unquote(blob_key))
if not blobstore.get(blob_key):
self.error(404)
else:
self.send_blob(blobstore.BlobInfo.get(blob_key), save_as=True)
def main():
application = webapp.WSGIApplication(
[('/', MainHandler),
('/upload', UploadHandler),
('/serve/([^/]+)?', ServeHandler),
], debug=True)
run_wsgi_app(application)
if __name__ == '__main__':
main()
这篇关于上传Google App Engine中的文件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！
