@Action("/validimg")public String validimg() throws Exception {        genernateCaptchaImage();        return null;}

 

 

protected void genernateCaptchaImage() throws IOException {        response.setHeader("Cache-Control", "no-store");        response.setHeader("Pragma", "no-cache");        response.setDateHeader("Expires", 0);        response.setContentType("image/jpeg");        ServletOutputStream out = response.getOutputStream();        try {            String captchaId = request.getSession(true).getId();            LOGGER.info("当前生产验证码的sessionId为: "+captchaId);            BufferedImage challenge = (BufferedImage) CaptchaServiceSingleton.getInstance().getChallengeForID(                    captchaId, request.getLocale());            ImageIO.write(challenge, "jpg", out);            out.flush();        } catch (CaptchaServiceException e) {        } finally {            out.close();        }    }

 

 

 

/** * JCaptcha的单例 *  * @author fuxingxign */public class CaptchaServiceSingleton {    private static ImageCaptchaService instance = new DefaultManageableImageCaptchaService(            new FastHashMapCaptchaStore(), new RdImageEngine(), 180, 100000, 75000);    /*     * private static ImageCaptchaService instance = new DefaultManageableImageCaptchaService( new     * FastHashMapCaptchaStore(), new GMailEngine(), 180, 100000 , 75000);     */    public static ImageCaptchaService getInstance() {        return instance;    }}

 

 

 

import java.awt.Color;import java.awt.Font;import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;import com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator;import com.octo.captcha.component.image.color.RandomRangeColorGenerator;import com.octo.captcha.component.image.fontgenerator.FontGenerator;import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;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.gimpy.GimpyFactory;public class RdImageEngine extends ListImageCaptchaEngine {    @Override    protected void buildInitialFactories() {        WordGenerator wgen = new RandomWordGenerator("abcdefghijklmnopqrstuvwxyz");        RandomRangeColorGenerator cgen = new RandomRangeColorGenerator(new int[] { 0, 100 }, new int[] { 0, 100 },                new int[] { 0, 100 });        TextPaster textPaster = new RandomTextPaster(Integer.valueOf(4),Integer.valueOf(4), cgen, true);        BackgroundGenerator backgroundGenerator = new UniColorBackgroundGenerator(Integer.valueOf(80), Integer.valueOf(37),                Color.WHITE);        Font[] fontsList = new Font[] { new Font("Arial", 0, 12), new Font("Tahoma", 0, 12),                new Font("Verdana", 0, 12), };        FontGenerator fontGenerator = new RandomFontGenerator(Integer.valueOf(26),Integer.valueOf(26), fontsList);        WordToImage wordToImage = new ComposedWordToImage(fontGenerator, backgroundGenerator, textPaster);        this.addFactory(new GimpyFactory(wgen, wordToImage));    }}