【发布时间】：2014-12-09 00:27:23
【问题描述】：
您好，我正在尝试上传实体的图像并将其放入另一个页面的图像标签中，但无法完成。
将整个 blob 内容写入响应是有效的，但如果我试图将 blob 内容写入 html 页面中的 标记，则它不可见。
以下是代码。请帮忙
import webapp2
from google.appengine.ext import ndb
import mimetypes
import logging
HTML_POST_PAGE = \
"""
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Image Upload</title>
</head>
<body>
<form action="/file_upload" enctype="multipart/form-data" method="post">
<div><input type="file" name="file"/></div>
<div><input type="submit" value="Upload"></div>
</form>
</body>
</html>
"""
OUTPUT_HTML_PAGE = """
<!DOCTYPE HTML>
<html lang="en">
<head>
<title>Image Upload</title>
</head>
<body>
<h1>Serving image dynamically.</h1>
<img src='/dyimg_serve?img_id=%s'></img>
</body>
</html>
"""
#Hardcoded value for Key name
email_id = "ryan@gmail.com"
#Updated Image Upload
class MyUser(ndb.Model):
file_name = ndb.StringProperty()
blob = ndb.BlobProperty()
class MainPage(webapp2.RequestHandler):
def get(self):
self.response.write(HTML_POST_PAGE)
#Handler for image upload
class FileUpload(webapp2.RequestHandler):
def post(self):
#Creating entity with fixed id
my_user = MyUser(id=email_id)
#Below lines to be added in the main code to put image in datastore
file_upload = self.request.POST.get("file", None)
file_name = file_upload.filename
my_user.file_name = file_name
my_user.blob = file_upload.file.read()
userKey = my_user.put()
#Navigating to other page to read image
self.response.out.write(OUTPUT_HTML_PAGE)
#Handler to read image into the <img> tag in the OUTPUT_HTML_PAGE
class DynamicImageServe(webapp2.RequestHandler):
def get(self):
oldUser = MyUser.get_by_id(email_id)
if oldUser != None and oldUser.blob != None:
## self.response.headers['Content-Type'] = 'image/png'
self.response.headers[b'Content-Type'] = mimetypes.guess_type(oldUser.file_name)[0]
self.response.write(oldUser.blob)
else:
self.response.write('Error while fetching image data')
application = webapp2.WSGIApplication([('/',MainPage ),('/file_upload',FileUpload),('/dyimg_serve',DynamicImageServe),], debug=True)
【问题讨论】：
标签： python google-app-engine google-cloud-datastore image-uploading app-engine-ndb