Yaniv Inbar said:
Google APIs Client Library for Java: now with OAuth 2.0 - The official Google Code blog
Today we are announcing a new milestone for the Java client library. With the version 1.5 release, we’re making available the open source Google OAuth Client Library for Java in Beta, with support for both OAuth 1.0a and OAuth 2.0. OAuth is an open standard for allowing a client application to securely gain access to a user’s private data stored on Google without ever asking for their password. Most Google APIs support OAuth 2.0, and we want to encourage adoption of OAuth 2.0 more widely on the web. That’s why we built this library to work with any API on the web -- not just Google APIs -- that comply with the OAuth specifications. Our current implementation of OAuth 2.0 is based on draft 10, but we will update it soon to the final draft, once it becomes an official standard. We encourage you to try it and send us your feedback.
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And here is an example of how easy it to use (from the post):
// Set up the HTTP transport and JSON factory
HttpTransport httpTransport = new NetHttpTransport();
JsonFactory jsonFactory = new JacksonFactory();
// Set up OAuth 2.0 access of protected resources
// using the refresh and access tokens, automatically
// refreshing the access token when it expires
GoogleAccessProtectedResource requestInitializer =
new GoogleAccessProtectedResource(accessToken, httpTransport,
jsonFactory, clientId, clientSecret, refreshToken);
// Set up the main Google+ class
Plus plus = new Plus(httpTransport, requestInitializer, jsonFactory);
// Make a request to access your profile and display it to console
Person profile = plus.people().get("me").execute();
System.out.println("ID: " + profile.getId());
System.out.println("Name: " + profile.getDisplayName());
System.out.println("Image URL: " + profile.getImage().getUrl());
System.out.println("Profile URL: " + profile.getUrl());