Gra*_*ton 78 python google-app-engine
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和接受文件上传和平面文件存储在Google Server上db.BlobProperty.
我很高兴有人可以提供代码示例(客户端和服务器端)如何完成.
sas*_*nin 49
实际上,App Egnine文档中回答了这个问题.请参阅上载用户图像的示例.
HTML代码,在<form> </ form>中:
<input type="file" name="img"/>
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('/')
010*_*101 43
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:
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('<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()
小智 6
我今天试试,它的工作原理如下:
我的sdk版本是1.3.x
html页面:
<form enctype="multipart/form-data" action="/upload" method="post" >
<input type="file" name="myfile" />
<input type="submit" />
</form>
服务器代码:
file_contents = self.request.POST.get('myfile').file.read()
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