captcha letters

In today's web pages, image verification codes are one of the most common ways to prevent bots from submitting forms. Here is not detailed introduction, I believe we have met.Now give the code to implement the CAPTCHA image using Python's PiL

Javaweb Learning Summary (ix)-Generate a CAPTCHA image from a servletBufferedImageClass IntroductionGenerate the CAPTCHA image is mainly used in a BufferedImage class, as follows:Create a drawimage Servlet to generate the captcha picture 1 package

Javaweb Learning Summary (ix)-Generate a CAPTCHA image from a servletBufferedImageClass IntroductionGenerate the CAPTCHA image is mainly used in a BufferedImage class, as follows:Create a drawimage Servlet to generate the captcha picture 1 package

First,BufferedImageClass IntroductionGenerate the CAPTCHA image is mainly used in a BufferedImage class, as follows:Create a drawimage Servlet to generate the captcha picture 1 package gacl.response.study; 2 Import Java.awt.Color; 3 Import

This article introduces a very good code generation PHP program, first when the user requests HTTP, the server side creates a unique SessionID, this is the session ID, and then to start the GD library or ImageMagick these drawing tools, The random

• Create a new PHP file captcha_code_file.php The code is as follows Copy Code Open Session FirstSession_Start ();Define foreground display verification code length & width$image _width = 120;$image _height =

In web development often use verification code, in order to prevent the registration of robots or malicious login and query, etc., the role should not be underestimated But the verification code is not a function can be done, it needs to generate

In PHP to generate verification code picture is quite simple, because in PHP provides us with the graphics Gd.dll Library, to enable the GD graphics library we just put PHP-GD in front of the php.ini; Method One The code is as follows

#!/usr/bin/env python#coding=utf-8import randomimport Image, Imagedraw, Imagefont, imagefilter _letter_cases = " Abcdefghjkmnpqrstuvwxy "# lowercase letters, removing potentially disturbing i,l,o,z_upper_cases = _letter_cases.upper () # uppercase

This article mainly introduces the PHP imitation Ecshop Verification code example, very good, with reference value, the need for friends can refer to the next The code for the Clone Ecshop Verification code is as follows: Encapsulation Captcha