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

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));
	}
}