Question

我的图片没有从数据存储区提供，我在图片应该是的页面上得到404.

以下是代码：

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()

一切都运行良好，除了404，我找不到任何搜索问题。

感谢您的帮助，对不起，如果我遗漏了任何内容，我会编辑任何内容。

Answer 1

假设您的上传工作正常，您需要为图片本身提供处理程序。目前您正在引用<img src="img?img_id=%s">，但img似乎无法解析处理程序中的任何内容（同样，您无需向{{{{}}提供结束</img>标记1}} HTML中的属性）。您要做的是为基于图像的请求设置处理程序，并将响应作为图像本身。您已经设置<img>用于显示该目的的内容（请注意，您可能希望将Image部分替换为实际图像，以便结果类型保持一致）。

为了将no image处理程序映射到URL，请尝试按如下方式修改处理程序：

Image

现在，这会将application = webapp.WSGIApplication([ ('/', MainPage), ('/img', Image), ('/upload2', UploadPage2), ], debug=True)的请求转发给/img处理程序（您可能还希望将Image标记更改为src，然后找到并返回你的形象。

尝试从GAE动态提供图像，获得404

1 个答案: