How to generate a unique hash for a URL?

Question

Given these two images from twitter.

http://a3.twimg.com/profile_images/130500759/lowres_profilepic.jpg
http://a1.twimg.com/profile_images/58079916/lowres_pr         


        

Answer 1

You can use UUID Class in Java to generate anything into UUID from bytes which is unique and you won't be having a problem with file lookup

String url = http://www.google.com;
String shortUrl = UUID.nameUUIDFromBytes("http://www.google.com".getBytes()).toString();