customize captcha engine with random funky color background and ignore case sencisive

CustomCaptchaEngine.java

import com.octo.captcha.CaptchaException;
import com.octo.captcha.CaptchaQuestionHelper;
import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator.FunkyBackgroundGenerator;
import com.octo.captcha.component.image.color.ColorGenerator;
import com.octo.captcha.component.image.fontgenerator.FontGenerator;
import com.octo.captcha.component.image.fontgenerator.TwistedAndShearedRandomFontGenerator;
import com.octo.captcha.component.image.textpaster.RandomTextPaster;
import com.octo.captcha.component.image.textpaster.TextPaster;
import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage;
import com.octo.captcha.component.image.wordtoimage.WordToImage;
import com.octo.captcha.component.word.wordgenerator.RandomWordGenerator;
import com.octo.captcha.component.word.wordgenerator.WordGenerator;
import com.octo.captcha.engine.image.ListImageCaptchaEngine;
import com.octo.captcha.image.ImageCaptcha;
import com.octo.captcha.image.gimpy.GimpyFactory;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.Serializable;
import java.util.Locale;
import java.util.Random;

/**
 * Created by jiacheo on 2016/11/7.
 */
public class CustomCaptchaEngine extends ListImageCaptchaEngine {
  @Override
  protected void buildInitialFactories() {
    //去掉 1 i I l , 2 z z, 5 s S, 9 q g, o O 0 等容易混淆（特别在在图片下）的字母，不让用户纠结。
    WordGenerator wordGenerator = new RandomWordGenerator("34678ABCDEFHJKMNPQRTUVWXLYabcdefhjkmnpqrtuvwxy");
    // nteger minAcceptedWordLength, Integer maxAcceptedWordLength,Color[]
    // textColors
    TextPaster textPaster = new RandomTextPaster(4,4, Color.WHITE);
    // Integer width, Integer height
    BackgroundGenerator backgroundGenerator  = new FunkyBackgroundGenerator(150,42, new RandomColorGennerator(), new RandomColorGennerator(), new RandomColorGennerator(), new RandomColorGennerator(), 0.5f);
    // Integer minFontSize, Integer maxFontSize
    FontGenerator fontGenerator = new TwistedAndShearedRandomFontGenerator(20, 22);
    WordToImage wordToImage = new ComposedWordToImage(fontGenerator,
        backgroundGenerator, textPaster);
    addFactory(new GimpyFactory(wordGenerator, wordToImage){
      public ImageCaptcha getImageCaptcha(Locale locale) {
        Integer wordLength = this.getRandomLength();
        String word = this.getWordGenerator().getWord(wordLength, locale);
        BufferedImage image ;
        try {
          image = this.getWordToImage().getImage(word);
        } catch (Throwable e) {
          throw new CaptchaException(e);
        }

        IgnoreCaseGimpy captcha = new IgnoreCaseGimpy(CaptchaQuestionHelper.getQuestion(locale, BUNDLE_QUESTION_KEY), image, word);
        return captcha;
      }
    });
  }

  public static class IgnoreCaseGimpy extends ImageCaptcha implements Serializable {

    private String response;

    IgnoreCaseGimpy(String question, BufferedImage challenge, String response) {
      super(question, challenge);
      this.response = response;
    }

    public final Boolean validateResponse(Object response) {
      return null != response && response instanceof String?this.validateResponse((String)response):Boolean.FALSE;
    }

    private final Boolean validateResponse(String response) {
      return new Boolean(response.equalsIgnoreCase(this.response));
    }
  }

  public static class RandomColorGennerator implements ColorGenerator {

    private Random random = new Random();

    private Color[] colors = new Color[] {Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.BLUE, Color.CYAN, Color.MAGENTA};

    @Override
    public Color getNextColor() {
      return colors[random.nextInt(colors.length)];
    }
  }

}