baigod / patchca

Simple yet powerful CAPTCHA library written in Java

Patchca: verification code library for Java

Overview

Simple yet powerful verification code library written in Java with zero dependency.

You can generate verification code picture like this:

ConfigurableCaptchaService cs = new ConfigurableCaptchaService();
cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170)));
cs.setFilterFactory(new CurvesRippleFilterFactory(cs.getColorFactory()));

FileOutputStream fos = new FileOutputStream("patcha_demo.png");
EncoderHelper.getChallangeAndWriteImage(cs, "png", fos);
fos.close();

it generate picture like this:

java -jar patchca.jar

if run on linux the captcha image is not loaded command on server

Ubuntu/Debian:

Install the JDK Fonts package on top of the Oracle JDK by running:
sudo apt-get install fonts-dejavu-core

Restart Server.

CentOS:

Install the JDK Fonts package on top of the Oracle JDK by running:

sudo yum install -y \
dejavu-lgc-sans-fonts \
dejavu-lgc-sans-mono-fonts \
dejavu-lgc-serif-fonts \
dejavu-sans-fonts \
dejavu-sans-mono-fonts \
dejavu-serif-fonts

Restart Server.