What is the easiest way to enable existent GWT application authenticate users using Google account? I tried googling (lol) it but have found no solutions that could work out of the box. Is there a library to solve this problem in like 10 lines of code?
P.S. The application I've mentioned isn't hosted at Google Apps if it matters.
I have been looking at gwt-oauth2 for this purpose recently. It looks pretty decent, and the docs are straightforward. Perhaps it could be of interest.
来源：https://stackoverflow.com/questions/7517327/easiest-way-to-enable-google-authentication-for-gwt-application-non-gae-hosted