adapter for patchca-captcha

CaptchaAdapter.java

import org.patchca.color.ColorFactory;
import org.patchca.filter.FilterFactory;
import org.patchca.filter.predefined.CurvesRippleFilterFactory;
import org.patchca.filter.predefined.DiffuseRippleFilterFactory;
import org.patchca.filter.predefined.DoubleRippleFilterFactory;
import org.patchca.filter.predefined.MarbleRippleFilterFactory;
import org.patchca.filter.predefined.WobbleRippleFilterFactory;
import org.patchca.service.Captcha;
import org.patchca.service.ConfigurableCaptchaService;
import org.patchca.word.RandomWordFactory;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import lombok.extern.slf4j.Slf4j;

/**
 * adapter for patchca-captcha
 * @author cqy
 * @since 2017/8/24.
 */
@Slf4j
public class CaptchaAdapter {

    ConfigurableCaptchaService cs = new ConfigurableCaptchaService(){
        @Override
        public Captcha getCaptcha() {
            Captcha captcha = super.getCaptcha();
            try {
                captcha.setImage(convertCMYK2RGB(captcha.getImage()));
            } catch (IOException ignored) {
                ignored.printStackTrace();
            }
            return captcha;
        }
        //fix ImageIO bug: https://stackoverflow.com/questions/2408613/unable-to-read-jpeg-image-using-imageio-readfile-file
        private BufferedImage convertCMYK2RGB(BufferedImage image) throws IOException{
//            log.info("Converting a CYMK image to RGB");
            //Create a new RGB image
            BufferedImage rgbImage = new BufferedImage(image.getWidth(), image.getHeight(),
                    BufferedImage.TYPE_3BYTE_BGR);
            // then do a funky color convert
            ColorConvertOp op = new ColorConvertOp(null);
            op.filter(image, rgbImage);
            return rgbImage;
        }
    };

    public CaptchaAdapter() {
        Random r = new Random();
        ColorFactory colorFactory = new ColorFactory() {
            private Color min = Color.black;
            private Color max = Color.white;
            @Override
            public Color getColor(int index) {
                return new Color( min.getRed() + r.nextInt((max.getRed() - min.getRed())),
                        min.getGreen() + r.nextInt((max.getGreen() - min.getGreen())),
                        min.getBlue() + r.nextInt((max.getBlue() - min.getBlue())));
            }
        };
        cs.setColorFactory(colorFactory);
        RandomWordFactory wordFactory = new RandomWordFactory();
        wordFactory.setCharacters("23456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM");
        wordFactory.setMaxLength(4);
        wordFactory.setMinLength(4);
        cs.setWordFactory(wordFactory);
//        SingleColorBackgroundFactory factory = new SingleColorBackgroundFactory();
//        factory.setColorFactory(colorFactory);
//        cs.setBackgroundFactory(factory);
        cs.setFilterFactory(new FilterFactory() {
            final List<FilterFactory> origins = Arrays.asList(
                    new CurvesRippleFilterFactory(colorFactory),
                    new MarbleRippleFilterFactory(),
                    new DoubleRippleFilterFactory(),
                    new WobbleRippleFilterFactory(),
                    new DiffuseRippleFilterFactory()
            );


            @Override
            public BufferedImage applyFilters(BufferedImage source) {
                int index = r.nextInt(origins.size());
                System.out.println(index);
                return origins.get(index).applyFilters(source);
            }
        });
    }

    //    @RequestMapping("captcha")
    public Captcha captcha(HttpServletResponse response) throws IOException {
        response.setContentType("image/jpeg");
//        response.setHeader("Pragma", "no-cache");
        long time = System.currentTimeMillis();
//        response.setDateHeader("Last-Modified", time);
//        response.setDateHeader("Date", time);
//        response.setDateHeader("Expires", time);

        Captcha captcha = cs.getCaptcha();

        ServletOutputStream out = response.getOutputStream();
//        ImageIO.write(captcha.getImage(), "jpg", out);
        return captcha;
    }
}