how to get the data in the datastore of App Engine by url

in Google Ap开发者_如何学Cp Engine,after using the makePersistent() to store the data in the datastore,i know how to get the data content by the key using getObjectById(). but now i wanna to get the data in the datastore by url. i think the url is created . so the question is how the url can be created to get the data in the datastore

There is no built-in means to access the datastore through URLs. If you choose to, your application can implement URLs that return data from the datastore.

I invite you to take a look at titan-files. It's a powerful file-system abstraction on top of the DataStore and/or blob store. I'm using it for a commercial application and so far I've been very happy with it.