这是一个老项目留下的问题，首先他是这么配置的

    	
        
    
    		
     
      
        	 	
     
      
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然后我写了两个类, GimpyCopy.java

/* * jcaptcha, the open source java framework for captcha definition and integration * Copyright (c) 2005 jcaptcha.net. All Rights Reserved. * See the LICENSE.txt file distributed with this package. */

package com.octo.captcha.image.gimpy;import com.octo.captcha.image.ImageCaptcha;import java.awt.image.BufferedImage;import java.io.Serializable;/** * 
A Gimpy is a ImagCaptcha. It is also the most common captcha.
 
    
 
     
Challenge type : image
 * 
     
Response type : String
 
     
Description : An image of a distorded word is shown. User have to recognize the * word and to submit it.
 
    
 * * @author Marc-Antoine Garrigue * @version 1.0 */public class GimpyCopy extends ImageCaptcha implements Serializable {    private String response;    GimpyCopy(String question, BufferedImage challenge, String response) {        super(question, challenge);        this.response = response;    }    /**     * Validation routine from the CAPTCHA interface. this methods verify if the response is not null and a String and     * then compares the given response to the internal string.     *     * @return true if the given response equals the internal response, false otherwise.     */    public final Boolean validateResponse(final Object response) {        return (null != response && response instanceof String)                ? validateResponse((String) response) : Boolean.FALSE;    }    /**     * Very simple validation routine that compares the given response to the internal string.     *     * @return true if the given response equals the internal response, false otherwise.     */    private final Boolean validateResponse(final String response) {        // 主要改的这里        return new Boolean(response.toLowerCase().equals(this.response.toLowerCase()));    }    ;}

GimpyCopyFactory.java

/* * jcaptcha, the open source java framework for captcha definition and integration * Copyright (c) 2005 jcaptcha.net. All Rights Reserved. * See the LICENSE.txt file distributed with this package. */

package com.octo.captcha.image.gimpy;import com.octo.captcha.CaptchaException;import com.octo.captcha.CaptchaQuestionHelper;import com.octo.captcha.component.image.wordtoimage.WordToImage;import com.octo.captcha.component.word.wordgenerator.WordGenerator;import com.octo.captcha.image.ImageCaptcha;import java.awt.image.BufferedImage;import java.security.SecureRandom;import java.util.Locale;import java.util.Random;/** * Factories for Gimpies. Built on top of WordGenerator and WordToImage. It uses thoses interfaces to build an * ImageCaptha answered by a String and for which the question is : Spell the word. */public class GimpyCopyFactory extends com.octo.captcha.image.ImageCaptchaFactory {    private Random myRandom = new SecureRandom();    private WordToImage wordToImage;    private WordGenerator wordGenerator;    public static final String BUNDLE_QUESTION_KEY = Gimpy.class.getName(); // 这个还是用原来的Gimpy    public GimpyCopyFactory(WordGenerator generator, WordToImage word2image) {        if (word2image == null) {            throw new CaptchaException("Invalid configuration" +                    " for a GimpyFactory : WordToImage can't be null");        }        if (generator == null) {            throw new CaptchaException("Invalid configuration" +                    " for a GimpyFactory : WordGenerator can't be null");        }        wordToImage = word2image;        wordGenerator = generator;    }    /**     * gimpies are ImageCaptcha     *     * @return the image captcha with default locale     */    public ImageCaptcha getImageCaptcha() {        return getImageCaptcha(Locale.getDefault());    }    public WordToImage getWordToImage() {        return wordToImage;    }    public WordGenerator getWordGenerator() {        return wordGenerator;    }    /**     * gimpies are ImageCaptcha     *     * @return a pixCaptcha with the question :"spell the word"     */    public ImageCaptcha getImageCaptcha(Locale locale) {        //length        Integer wordLength = getRandomLength();        String word = getWordGenerator().getWord(wordLength, locale);        BufferedImage image = null;        try {            image = getWordToImage().getImage(word);        } catch (Throwable e) {            throw new CaptchaException(e);        }        // 这里用我们自己写的GimpyCopy        ImageCaptcha captcha = new GimpyCopy(CaptchaQuestionHelper.getQuestion(locale, BUNDLE_QUESTION_KEY),                image, word);        return captcha;    }    protected Integer getRandomLength() {        Integer wordLength;        int range = getWordToImage().getMaxAcceptedWordLength() -                getWordToImage().getMinAcceptedWordLength();        int randomRange = range != 0 ? myRandom.nextInt(range + 1) : 0;        wordLength = new Integer(randomRange +                getWordToImage().getMinAcceptedWordLength());        return wordLength;    }}

这下好了，问题解决了