使用jcaptcha做验证码组件

 

http://xucunliang.javaeye.com/blog/480341

http://www.xue163.com/html/20091210/2667646.html

http://blog.chinaunix.net/u2/86974/showart_1997021.html

http://wwwzhouhui.javaeye.com/?page=3&show_full=true

http://hi.baidu.com/lff0305/blog/item/615f928b630d3cd4fd1f10a4.html

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

源码 copy to clipboard 打印 ？

 

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));   
    }   
}