1

我的图像没有从数据存储中提供，我在图像应该在的页面上收到 404。

这是代码：

import cgi
import datetime
import urllib
import wsgiref.handlers

from google.appengine.ext import db
from google.appengine.api import images
from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app


class PropUpload(db.Model):
  property_name = db.StringProperty()
  property_address = db.StringProperty()
  project_type = db.StringProperty()
  building_size = db.StringProperty()
  stories = db.StringProperty()
  space_available = db.StringProperty()
  per_leased = db.StringProperty()
  prop_image = db.BlobProperty()
  date = db.DateTimeProperty(auto_now_add=True)


class MainPage(webapp.RequestHandler):
  def get(self):
    self.response.out.write("""<!DOCTYPE html>
            <html lang="en">
              <head>
      <somehtml>""")

    display2 = db.Query(PropUpload)
    display2.order("-date")
    for dis in display2:
        self.response.out.write('<div><img src="img?img_id=%s"></img>' % dis.key())
        self.response.out.write('<h4>Property Name: %s </h4><br>' % dis.property_name)
        self.response.out.write('<div style="border-bottom: 1px solid #CCC;">Address: %s </div><br>' % dis.property_address)
        self.response.out.write('<div style="border-bottom: 1px solid #CCC;">Type:  %s ft<sup>2</sup></div><br>' % dis.project_type)
        self.response.out.write('<div style="border-bottom: 1px solid #CCC;">Stories:  %s </div><br>' % dis.stories)

    self.response.out.write("<more html>")


class Image(webapp.RequestHandler):
  def get(self):
    img_id = self.request.get("img_id")
    dis = db.get(self.request.get("img_id"))
    if dis.prop_image:
      self.response.headers['Content-Type'] = "image/png"
      self.response.out.write(dis.prop_image)
    else:
      self.response.out.write("no image")


class UploadPage2(webapp.RequestHandler):
  def get(self):
    self.response.out.write("""<!DOCTYPE html>
    <form action="/upload2" enctype="multipart/form-data" method="post">
                        <div><label>Property Name:&nbsp</label></div>
                        <div><textarea name="prop-name" rows="1" columns "100"></textarea></div>
                        <br><br>
                        <div><label>Property Address:&nbsp</label></div>
                        <div><textarea name="address" rows="1" columns "100"></textarea></div>
                        <br><br>
                        <div><label>Property Type:&nbsp</label></div>
                        <div><textarea name="prop-type" rows="1" columns "100"></textarea></div>
                        <br><br>
                        <div><label>Building Size:&nbsp</label></div>
                        <div><textarea name="size" rows="1" columns "100"></textarea></div>
                        <br><br>
                        <div><label>Stories:&nbsp</label></div>
                        <div><textarea name="stories" rows="1" columns "100"></textarea></div>
                        <br><br>
                        <div><label>Space Available:&nbsp</label></div>
                        <div><textarea name="title" rows="2" columns "100"></textarea></div>
                        <br>
                        <div><label>Percent Leased:</label></div><span>
                        <div><textarea name="percent" rows="3" cols="100"></textarea></div><br>
                        <div><label>Picture:</label></div>
                        <div><input type="file" name="img"/></div>
                        <div><label></label></div><span>
                        <div><input type="submit" value="Upload" /></div>
                      </form>""")


  def post(self):
    props = PropUpload()
    property_name = self.request.get('prop-name')
    property_address = self.request.get('address')
    property_type = self.request.get('prop=type')
    building_size = self.request.get('size')
    stories = self.request.get('stories')
    space_available = self.request.get('space')
    prop_image = self.request.get('img')
    per_leased = self.request.get('percent')
    props.property_name = property_name
    props.property_address = property_address
    props.property_type = property_type
    props.building_size = building_size
    props.stories = stories
    props.space_available = space_available
    props.prop_image = db.Blob(prop_image)
    props.per_leased = per_leased
    props.put()
    self.redirect('/upload2')


application = webapp.WSGIApplication([
    ('/', MainPage),
    ('/upload2', UploadPage2),
    ], debug=True)


def main():
  run_wsgi_app(application)

if __name__ == '__main__':
  main()

一切正常，除了 404，我找不到任何搜索这个问题的东西。

感谢您的帮助，很抱歉，如果我遗漏了任何内容，我会编辑任何内容。

4

1 回答 1

2

假设您的上传工作正常，您需要为图像本身提供一个处理程序。现在您正在引用<img src="img?img_id=%s">，但img似乎无法解析处理程序中的任何内容（此外，您不需要为HTML</img>中的属性提供结束标记）。<img>您要做的是为基于图像的请求设置一个处理程序，并让响应是图像本身。您已经Image为该目的进行了设置（请注意，您可能希望将no image部件替换为实际图像，以便结果类型保持一致）。

要将处理程序映射Image到 URL，请尝试按如下方式修改处理程序：

application = webapp.WSGIApplication([
    ('/', MainPage),
    ('/img', Image),
    ('/upload2', UploadPage2),
    ], debug=True)

现在，这会将请求路由到/img处理Image程序（您可能还希望将src标签更改为<img src="/img?img_id=%s">，然后它应该定位并返回您的图像。

于 2012-12-18T21:49:18.790 回答