How to implement openId java web based application?

Posted by satya on Stack Overflow See other posts from Stack Overflow or by satya
Published on 2011-01-04T08:39:47Z Indexed on 2011/01/04 8:54 UTC
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java

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openid

In my web application i want to implement the OpenId just like stackoverflow.com have to login to its web-site.

In details you find while login to stackoverflow.com alt text

So when if one choose google then it allow the uses to log in through google account.

Please tell me how to implement it in java web application in details. Is there any single api for login through different website like(yahoo,google,facebook,etc)

Thanks

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