Shulou(Shulou.com)06/02 Report--

This article is about how JSP implements color CAPTCHA. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Generate a picture with 4 random numbers and a cluttered background, the number and background color will change, and the server will refresh (also change with history.go (- 1)).

The file http://blog.itpub.net/9650775/viewspace-922495/image.jsp that produces the CAPTCHA image

255) fc=255

If (bc > 255) bc=255

Int r=fc+random.nextInt (bc-fc)

Int g=fc+random.nextInt (bc-fc)

Int b=fc+random.nextInt (bc-fc)

Return new Color (rmae gpene b)

}

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