验证码生成组件--JCaptcha的使用(二)

package com.bkgd.cms.servlet;

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

import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator;
import com.octo.captcha.component.image.color.RandomListColorGenerator;
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.ListImageCaptchaEngine;
import com.octo.captcha.image.gimpy.GimpyFactory;

/**
 * 仿照JCaptcha2.0编写GMail验证码样式的图片引擎.
 */
public class GMailEngine extends ListImageCaptchaEngine {
	@Override
	protected void buildInitialFactories() {
		int minWordLength = 4;
		int maxWordLength = 4;
		int fontSize = 26;
		int imageWidth = 110;
		int imageHeight = 50;
		//在页面上将显示的内容
		WordGenerator dictionnaryWords = new RandomWordGenerator("1234567890");
		TextPaster randomPaster = new DecoratedRandomTextPaster(minWordLength,
				maxWordLength, new RandomListColorGenerator(
						new Color[] { new Color(0, 0, 0) }),
				new TextDecorator[] {});
		BackgroundGenerator background = new UniColorBackgroundGenerator(
				imageWidth, imageHeight, Color.white);
		FontGenerator font = new RandomFontGenerator(fontSize, fontSize,
				new Font[] { new Font("nyala", Font.BOLD, fontSize),
						new Font("Bell MT", Font.PLAIN, fontSize),
						new Font("Credit valley", Font.BOLD, fontSize) });

		ImageDeformation postDef = new ImageDeformationByFilters(new ImageFilter[] {});
		ImageDeformation backDef = new ImageDeformationByFilters(new ImageFilter[] {});
		ImageDeformation textDef = new ImageDeformationByFilters(new ImageFilter[] {});

		WordToImage word2image = new DeformedComposedWordToImage(font,
				background, randomPaster, backDef, textDef, postDef);
		addFactory(new GimpyFactory(dictionnaryWords, word2image));
	}

}

HttpServletRequest request = ServletActionContext.getRequest();
String sessID = request.getSession().getId();
Boolean isResponseCorrect = JCaptchaServiceSingleton.getInstance().validateResponseForID(sessID, checkCode);
if(isResponseCorrect){
	return "true"
}else{
	return "false"	
}