在Google App Engine中上传文件

Python代码:

class Guestbook(webapp.RequestHandler):
  def post(self):
    greeting = Greeting()
    if users.get_current_user():
      greeting.author = users.get_current_user()
    greeting.content = self.request.get("content")
    avatar = self.request.get("img")
    greeting.avatar = db.Blob(avatar)
    greeting.put()
    self.redirect('/')

这是一个完整的工作文件.我从谷歌网站上取下了原版并对其进行了修改,使其更加真实.

有几点需要注意:

此代码使用BlobStore API

ServeHandler类中这一行的目的是"修复"键,以便它消除浏览器中可能出现的任何名称错误(我在Chrome中没有观察到任何名称)

blob_key = str(urllib.unquote(blob_key))

最后的"save_as"子句很重要.它将确保文件名在发送到您的浏览器时不会被破坏.摆脱它来观察会发生什么.

self.send_blob(blobstore.BlobInfo.get(blob_key), save_as=True)

祝好运!

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('')
        self.response.out.write('' % upload_url)
        self.response.out.write("""Upload File: 
  """)

        for b in blobstore.BlobInfo.all():
            self.response.out.write('
' + str(b.filename) + '')

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()