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我正在尝试显示上传的 blob 图像。它似乎可以存储，但调用时不会显示在 html 模板上。甚至似乎出现在日志记录中。在查看其他示例时，我看到的唯一真正区别是您必须遍历列表，但实际上只想拉一张图片。非常感谢您提供的任何建议。-谢谢

处理程序：

class PictureHandler(BaseHandler2):
def get(self, **kwargs):
    user_session = self.user
    user_session_object = self.auth.store.get_session(self.request)

    user_info = models.User.get_by_id(long( self.user_id ))
    user_info_object = self.auth.store.user_model.get_by_auth_token(
        user_session['user_id'], user_session['token']) 

    user = self.session.get('user') 

    uploads = db.GqlQuery("SELECT * FROM UserPictureUpload WHERE user =:1 ORDER BY created DESC", user_info.username).get()

    upload_url = blobstore.create_upload_url('/upload')

    params = {
    'upload_url': upload_url,
    'user': user_info.username,
    'uploads': uploads      
    }       

    return self.render_template('picture.html', **params)


class UploadHandler(blobstore_handlers.BlobstoreUploadHandler, BaseHandler2):
def post(self):
    user_session = self.user
    user_session_object = self.auth.store.get_session(self.request)

    user_info = models.User.get_by_id(long( self.user_id ))
    user_info_object = self.auth.store.user_model.get_by_auth_token(
        user_session['user_id'], user_session['token']) 

    user = self.session.get('user') 

    title = self.request.get('title')
    pic = self.request.get("picfile")   


    if pic:
        picture = db.Blob(pic)

    upload = UserPictureUpload(title = title, picture=picture, user=user_info.username)         
    upload.put()
    self.redirect('/settings/picture')  


class ViewHandler(blobstore_handlers.BlobstoreDownloadHandler, BaseHandler2):
def get(self):    
    user_session = self.user
    user_session_object = self.auth.store.get_session(self.request)

    user_info = models.User.get_by_id(long( self.user_id ))
    user_info_object = self.auth.store.user_model.get_by_auth_token(
        user_session['user_id'], user_session['token']) 

    user = self.session.get('user') 


    upload_key_str = self.request.params.get('key')

    if upload_key_str:              

        upload = db.get(upload_key_str)
        if upload:
            logging.info('** Upload Found** --  %s' % upload.picture)  

        self.send_blob(upload.picture)      


    if not upload_key_str:

        self.error(404)
        return

路由：

RedirectRoute('/settings/picture', handlers.PictureHandler, name='picture', strict_slash=True), 
RedirectRoute('/upload', handlers.UploadHandler, name='upload', strict_slash=True), 
RedirectRoute('/view', handlers.ViewHandler, name='view', strict_slash=True)

html: 

<form action="{{ upload_url }}"  method="post" enctype="multipart/form-data">
<label for="title">Title:</label>
<input type="text" id="title" name="title" /><br />
<label for="upload">File:</label>
<input type="file" id="upload" name="picfile" /><br />
<input type="submit" value="Upload Picture" />
</form>
<br />
<img src='/view?key={{uploads.key()}}' alt='no image'/></img>

应用引擎日志：

信息 2013-07-30 16:11:20,946 handlers.py:875] ** 上传找到** -- 内容类型：图像/jpeg

内容长度：775702

内容-MD5：NWE0NGM3YmE1YmJlNGVjODY3MjMzZDY3ZTQ4MDY4NDg=

内容处置：表单数据；名称="图片文件"; 文件名="水母.jpg"

X-AppEngine-Upload-Creation: 2013-07-29 15:41:00.481000

信息 2013-07-30 11:11:21,005 server.py:584] 默认值：“GET /view?key=ag5kZXZ-c2FuZGVuZ2luZXIeCxIRVXNlclBpY3R1cmVVcGxvYWQYgICAgJjxtgsM HTTP/1.1”200 -

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1 回答 1

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看起来您正在 blobstore 中上传 blob，但从您的上传后处理程序创建一个密钥并将其存储为图片属性上的另一个 blob，而不是从上传的 blobinfo 中获取 blobkey，来自此处：https ://developers.google.com /appengine/docs/python/tools/webapp/blobstorehandlers

你可以得到

upload = self.get_uploads()[0]
picture=upload.key()

那么这就是你放在你的send_blob上的东西。

于 2013-07-30T17:41:52.220 回答