如何在GAE数据存储中显示图像？

如何在GAE数据存储中显示图像？

您正在将图像源指向未定义的错误

img

路线。
正确的链接应指向

/image

这样：

<img src="http://www.kaotop.com/skin/sinaskin/image/nopic.gif"></img>

我已经通过更正测试了您的代码，并且效果很好：

from google.appengine.ext import dbfrom google.appengine.api import usersfrom google.appengine.ext import webappfrom google.appengine.ext.webapp.util import run_wsgi_appimport loggingclass HomePage(db.Model):    thumbnail = db.BlobProperty()    firm_name = db.StringProperty()class ImageUpload(webapp.RequestHandler):    def get(self):        self.response.out.write("""        <form action="/imagesave" enctype="multipart/form-data" method="post">        <div><label>firm name:</label> <input type="text" name="firm_name" size=40></div>        <div><input type="file" name="img" /></div>        <div><input type="submit" value="Upload image"></div>        </form>        """)class ImageSave(webapp.RequestHandler):    def post(self):        homepage = HomePage()        thumbnail = self.request.get("img")        firm_name = self.request.get("firm_name")        homepage.thumbnail = db.Blob(thumbnail)        homepage.firm_name = firm_name        homepage.put()        self.redirect("/imageupload")class ImageResize(webapp.RequestHandler):    def post(self):        q = HomepageImage.all()        q.filter("firm_name", "mta")        qTable = q.get()        if qTable: qTable.thumbnail = db.Blob(images.resize(self.request.get("img"), 32, 32)) db.put(qTable)        else: self.response.out.write("""firm not found""")        self.redirect("/imageupload")class DisplayImage(webapp.RequestHandler):    def get(self):        query = HomePage.all()        query.filter("firm_name", "mta")        result = query.get()        self.response.out.write("""firm name: %s""" % result.firm_name)        self.response.out.write("""<img src="http://www.kaotop.com/skin/sinaskin/image/nopic.gif"></img>""" %        result.key())class Image(webapp.RequestHandler):    def get(self):        img_id = self.request.get("img_id")        logging.info("""**************************img_id: %s**************************""" % img_id)        homepage = db.get(self.request.get("img_id"))        if homepage.thumbnail:     self.response.headers['Content-Type'] = "image/jpg"     self.response.out.write(homepage.thumbnail)        else:     self.response.out.write("no image")application = webapp.WSGIApplication([("/imageresize",ImageResize),("/imageupload", ImageUpload),("/displayimage", DisplayImage),("/imagesave", ImageSave),("/image", Image),],     debug=True)def main():    run_wsgi_app(application)if __name__ == "__main__":    main()