在GAE中下載/列出文件Python

Question

我設法讓上傳工作，但現在我必須讓文件顯示在列表中（文件名，日期上傳/創建，文件類型和下載選項）我找不到讓它工作

我知道我在尋找：filename（它可以鏈接到查看圖像和左邊的複選框，您可以在下面的html中看到），內容類型和創建日期。

HTML：

<form action="/download" method="post"> 
     <table id="downloadFile" width="100%"> 
      <tr> 
       <td> 
        <table id="downloadFileDetails"> 
         <tr id="dld"> 
          <td id="dld" width="2%"></td> 
          <td id="dld" width="80%">File Name</td> 
          <td id="dld" width="10%">Upload Date</td> 
          <td id="dld" width="8%">Format</td> 
         </tr> 
         <tr> 
          <td id="dld" style="vertical-align: middle; text-align: center "><input type="checkbox" name="checkFile" >&nbsp</td> 
          <td id="dld">test</td> 
          <td id="dld">test</td> 
          <td id="dld">test</td> 
         </tr> 
         {% for file in file_query %} 
         <tr> 
          <td id="dld" style="vertical-align: middle; text-align: center "><input type="checkbox" name="checkFile" >&nbsp</td> 
          <td id="dld">{{file.user}}</td> 
          <td id="dld">{{file.blob_key}}</td> 
          <td id="dld">{{file.last_touch}}</td> 
         </tr> 
         {% endfor %} 
        </table> 
       </td> 
      </tr> 
      <tr> 
       <td><input type="submit" value="Download File" name="submit"></td> 
      </tr> 
     </table> 
    </form> 

Python代碼：

import os 

from google.appengine.api import users 
from google.appengine.ext import blobstore 
from google.appengine.ext import ndb 
from google.appengine.ext.webapp import blobstore_handlers 
import webapp2 
import jinja2 


jinja_env = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), 
    autoescape=True) 

#Key to serve as a parent 
PARENT_KEY = ndb.Key("Entity", "files_root") 

# This datastore model keeps track of which users uploaded which photos. 
class UserPhoto(ndb.Model): 
user = ndb.StringProperty() 
blob_key = ndb.BlobKeyProperty() 
filename = ndb.StringProperty() 
#last_touch = ndb.DateTimeProperty(auto_now_add = True) 

class PhotoUploadFormHandler(webapp2.RequestHandler): 
def get(self): 
    file_query = UserPhoto.query(ancestor = PARENT_KEY)#.order(-UserPhoto.last_touch) 
    upload_url = blobstore.create_upload_url('/upload') 
    templateHome = jinja_env.get_template("templates/page.html") 
    self.response.out.write(templateHome.render({"file_query": file_query}).format(upload_url)) 

# [START upload_handler] 
class PhotoUploadHandler(blobstore_handlers.BlobstoreUploadHandler): 
def post(self): 
    try: 
     upload = self.get_uploads()[0] 
     user_photo = UserPhoto(parent = PARENT_KEY, 
      user=users.get_current_user().user_id(), 
      blob_key=upload.key(), 
      filename = upload.filename()) 
     user_photo.put() 


     self.redirect(self.request.referer) 

    except: 
     self.error(500) 
# [END upload_handler] 

app = webapp2.WSGIApplication([ 
('/', PhotoUploadFormHandler), 
('/upload', PhotoUploadHandler) 
#('/view_photo/([^/]+)?', ViewPhotoHandler), 
], debug=True) 

消息我在日誌中獲取：

INFO  2016-05-14 20:54:05,506 module.py:787] default: "GET/HTTP/1.1" 200 1997 
INFO  2016-05-14 20:54:05,525 module.py:787] default: "GET /static/styles.css HTTP/1.1" 304 - 
INFO  2016-05-14 20:54:05,546 module.py:787] default: "GET /favicon.ico HTTP/1.1" 200 8348 
INFO  2016-05-14 20:54:11,806 module.py:787] default: "POST /upload HTTP/1.1" 500 - 

Answer 1

它看起來像你從the docs重新創建示例應用程序。該示例掩蓋了的信息中的一個重要的部分，其可以被發現here：

（）方法返回的BlobInfo對象，一個用於在所述請求中的每個上傳的文件的列表的get_uploads。

所以，如果你想捕捉的文件名，例如，你需要做這樣的事情在你的上傳處理程序（並相應地調整你的UserPhoto模型）：

upload = self.get_uploads()[0] 
user_photo = UserPhoto(
    user=users.get_current_user().user_id(), 
    blob_key=upload.key(), 
    filename=upload.filename 
) 
user_photo.put() 

的get_uploads方法返回BlobInfo對象的列表。對這些對象的文檔可以在這裏找到：

• google.appengine.ext.blobstore.blobstore module

注：我沒有與AppEngine上上傳任何經驗，這個代碼沒有經過測試，因此它可能在一些被關閉的細節。我只是按照文檔去做。但我懷疑它會涉及到潛在的問題。如果有任何細節需要更改，請告訴我。