JSP使用jcaptcha做验证码组件

jcaptcha验证码组件官网：http://jcaptcha.octo.com/confluence/display/general/Simple+Servlet+Integration+documentation

如果验证码需要忽略大小写，有两种方法：

1、WordGenerator参数大写或小写只用一种，那么在校验时将用户输入uppercase或lowercase一下

2、修改源码Gimpy类中的 private final Boolean validateResponse(final String response){

　　　　return new Boolean(response.equals(this.response));

}，把equals 换成equalsIgnoreCase，重新编译打成jar包

第一种方法范围窄了点，需要修改两处，第二种方法只需要修改这一个地方

package cn.amzsoft.checkcode.servlet;

import java.awt.Color;
import java.awt.Font;
import java.awt.image.ImageFilter;

import com.jhlabs.image.WaterFilter;
import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator.GradientBackgroundGenerator;
import com.octo.captcha.component.image.color.RandomRangeColorGenerator;
import com.octo.captcha.component.image.deformation.ImageDeformation;
import com.octo.captcha.component.image.deformation.ImageDeformationByFilters;
import com.octo.captcha.component.image.fontgenerator.FontGenerator;
import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;
import com.octo.captcha.component.image.textpaster.DecoratedRandomTextPaster;
import com.octo.captcha.component.image.textpaster.TextPaster;
import com.octo.captcha.component.image.textpaster.textdecorator.TextDecorator;
import com.octo.captcha.component.image.wordtoimage.DeformedComposedWordToImage;
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.gimpy.DefaultGimpyEngine;
import com.octo.captcha.image.gimpy.GimpyFactory;

public class ImageCodeEngine extends DefaultGimpyEngine {

    private static final String CODE = "ABCDEFGHJKLMNOPQRSTUVWXYZ123456789abcdefghjklmnopqrstuvwxyz";// I、0去掉"一二三四五六七字符显示的个数"
    // 字符显示的个数
    private static final Integer MIN_WORD_LEN = new Integer(4);
    // 字符显示的个数
    private static final Integer MAX_WORD_LEN = new Integer(4);
    // 验证码图片的高度宽度设定
    private static final Integer IMAGE_WIDTH = new Integer(100);
    private static final Integer IMAGE_HEIGHT = new Integer(40);
    // 验证码中显示的字体大小
    private static final Integer MIN_FONT_SIZE = new Integer(24);
    private static final Integer MAX_FONT_SIZE = new Integer(26);

    protected void buildInitialFactories() {
        WordGenerator wordGenerator = new RandomWordGenerator(CODE);
        BackgroundGenerator backgroundGenerator = new GradientBackgroundGenerator(
                IMAGE_WIDTH, IMAGE_HEIGHT, Color.white, Color.white);
        // 字体格式
        Font[] fontsList = new Font[]{Font.decode("Arial"),Font.decode("Tahoma"),Font.decode("Verdana")};
//        fontsList = new Font[]{Font.decode("华文细黑")};//可以使用中文验证码，另外汉字宽度比较大，要重新调整一下字体大小,不然会出现异常
        // 字体随机生成
        FontGenerator fontGenerator = new RandomFontGenerator(MIN_FONT_SIZE,MAX_FONT_SIZE,fontsList);
        // 背景颜色随机生成
        // 验证码的颜色-使用随机颜色器new Integer[]{0,100},new Integer[]{0,100}, new
        // Integer[]{0,100}
        RandomRangeColorGenerator cgen = new RandomRangeColorGenerator(
                new int[] { 0, 150 }, new int[] { 0, 150 },
                new int[] { 0, 150 });
//        backgroundGenerator = new FunkyBackgroundGenerator(IMAGE_WIDTH, IMAGE_HEIGHT);
        
        //文字干扰器--- 可以创建多个
//        BaffleTextDecorator baffleTextDecorator = new BaffleTextDecorator(2,cgen);//气泡干扰
//        LineTextDecorator lineTextDecorator = new LineTextDecorator(1,cgen);//曲线干扰
        TextDecorator[] textDecorators = new TextDecorator[0];
//        textDecorators[0] = baffleTextDecorator;
        //textDecorators[0] = lineTextDecorator;
        TextPaster textPaster = new DecoratedRandomTextPaster(MIN_WORD_LEN,MAX_WORD_LEN, cgen,true, textDecorators);
        
        //过滤器
        WaterFilter water = new WaterFilter();
        water.setAmplitude(4d);//振幅
        water.setAntialias(true);//显示字会出现锯齿状,true就是平滑的
        //water.setPhase(30d);//月亮的盈亏
        water.setWavelength(60d);//
        
        ImageDeformation backDef = new ImageDeformationByFilters(
                new ImageFilter[]{});
        ImageDeformation textDef = new ImageDeformationByFilters(
                new ImageFilter[]{});
        ImageDeformation postDef = new ImageDeformationByFilters(
                new ImageFilter[]{water});
        // 生成图片输出
//        WordToImage wordToImage = new ComposedWordToImage(fontGenerator,
//                backgroundGenerator, textPaster);
//      addFactory(new GimpyFactory(wordGenerator, wordToImage));
        WordToImage word2image  = new DeformedComposedWordToImage(fontGenerator, backgroundGenerator, textPaster,
                backDef,
                textDef,
                postDef
        );
        addFactory(new GimpyFactory(wordGenerator, word2image));
    }
}