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Generating captcha (alpha numeric) in java

Vinod Vinu
Ranch Hand

Joined: Aug 30, 2009
Posts: 217
Hi, can someone give me any idea of generating randon alphanumeric words in java. I do not want alphanumeric inside an image like usually we see in various web sites.
I just need random alphanumeric series.

thanks


Vinod Kumar Nair
"Any fool can write code that a computer can understan. Good programmers write code that humans can understand."
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11354
    
  16

just generate a random number from 1-36, and map them to A-Z plus 0-9.


There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39079
    
  23
Adding random affine transforms, changes of font, etc, will help.
 
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subject: Generating captcha (alpha numeric) in java