package com.wizriver.servlet;
import java.awt.Color;
import java.awt.Font;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator.GradientBackgroundGenerator;
import com.octo.captcha.component.image.fontgenerator.FontGenerator;
import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;
import com.octo.captcha.component.image.textpaster.RandomTextPaster;
import com.octo.captcha.component.image.textpaster.SimpleTextPaster;
import com.octo.captcha.component.image.textpaster.TextPaster;
import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage;
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.ImageCaptcha;
import com.octo.captcha.image.ImageCaptchaFactory;
import com.octo.captcha.image.gimpy.GimpyFactory;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
@SuppressWarnings("unchecked")
public class CaptchaServiceSingleton extends ListImageCaptchaEngine {
private static Logger log = Logger.getLogger(CaptchaServiceSingleton.class);
private static final Integer MIN_WORD_LENGTH = new Integer(4);
private static final Integer MAX_WORD_LENGTH = new Integer(5);
private static final Integer IMAGE_WIDTH = new Integer(90);
private static final Integer IMAGE_HEIGHT = new Integer(30);
private static final Integer MIN_FONT_SIZE = new Integer(12);
private static final Integer MAX_FONT_SIZE = new Integer(14);
private static final String NUMERIC_CHARS = "23456789";// No numeric 0
private static final String UPPER_ASCII_CHARS = "ABCDEFGHJKLMNPQRSTXYZ";// No
// upper
// O I
// we dont use the lower characters because it cause dificult in some case,
// so that
// we must always UPPERCASE the input from user (currently in
// OnlineUserImpl)
private static final String LOWER_ASCII_CHARS = "abcdefghjkmnpqrstxyz";// No
// lower
// o i
/**
* Singleton instance of this class
*/
private static CaptchaServiceSingleton instance = new CaptchaServiceSingleton();
private ArrayList textPasterList;
private ArrayList backgroundGeneratorList;
private ArrayList fontGeneratorList;
ImageCaptcha imageCaptcha = null;
/**
* Private constructor to prevent instantiation
*/
private CaptchaServiceSingleton() {
}
public static CaptchaServiceSingleton getInstance() {
return instance;
}
protected void buildInitialFactories() {
try {
textPasterList = new ArrayList();
backgroundGeneratorList = new ArrayList();
fontGeneratorList = new ArrayList();
textPasterList.add(new SimpleTextPaster(MIN_WORD_LENGTH,
MAX_WORD_LENGTH, Color.black));
textPasterList.add(new RandomTextPaster(MIN_WORD_LENGTH,
MAX_WORD_LENGTH, Color.black));
textPasterList.add(new SimpleTextPaster(MIN_WORD_LENGTH,
MAX_WORD_LENGTH, Color.black));
textPasterList.add(new RandomTextPaster(MIN_WORD_LENGTH,
MAX_WORD_LENGTH, Color.black));
textPasterList.add(new SimpleTextPaster(MIN_WORD_LENGTH,
MAX_WORD_LENGTH, Color.blue));
textPasterList.add(new RandomTextPaster(MIN_WORD_LENGTH,
MAX_WORD_LENGTH, Color.blue));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.orange, Color.white));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.white, Color.green));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.gray, Color.white));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.white, Color.orange));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.green, Color.white));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.yellow, Color.white));
backgroundGeneratorList.add(new GradientBackgroundGenerator(
IMAGE_WIDTH, IMAGE_HEIGHT, Color.white, Color.magenta));
// fontGeneratorList.add(new
// TwistedAndShearedRandomFontGenerator(MIN_FONT_SIZE,
// MAX_FONT_SIZE));
// fontGeneratorList.add(new
// TwistedRandomFontGenerator(MIN_FONT_SIZE, MAX_FONT_SIZE));// link
// character too much
Font f = Font.decode("华文细黑");
fontGeneratorList.add(new RandomFontGenerator(MIN_FONT_SIZE,
MAX_FONT_SIZE,new Font[]{f}));// to easy to read
// fontGeneratorList.add(new
// DeformedRandomFontGenerator(MIN_FONT_SIZE, MAX_FONT_SIZE));// to
// small font
// no char upper O, char lower o and numerric 0 because user cannot
// answer
WordGenerator words = new RandomWordGenerator(NUMERIC_CHARS
+ UPPER_ASCII_CHARS);
for (Iterator fontIter = fontGeneratorList.iterator(); fontIter.hasNext();) {
FontGenerator font = (FontGenerator) fontIter.next();
for (Iterator backIter = backgroundGeneratorList.iterator(); backIter .hasNext();) {
BackgroundGenerator back = (BackgroundGenerator) backIter.next();
for (Iterator textIter = textPasterList.iterator(); textIter.hasNext();) {
TextPaster parser = (TextPaster) textIter.next();
WordToImage word2image = new ComposedWordToImage(font,back, parser);
ImageCaptchaFactory factory = new GimpyFactory(words,word2image);
addFactory(factory);
}
}
}
} catch (Exception ex) {
log.error("产生校验码初始化异常 ＝＝ " + ex);
// throw ex;
}
}
/**
* Write the captcha image of current user to the servlet response
*
* @param request
* HttpServletRequest
* @param response
* HttpServletResponse
* @throws IOException
*/
public void writeCaptchaImage(HttpServletRequest request,
HttpServletResponse response) throws IOException {
imageCaptcha = getNextImageCaptcha();
HttpSession session = request.getSession();
session.setAttribute("imageCaptcha", imageCaptcha);
BufferedImage image = (BufferedImage) imageCaptcha.getChallenge();
OutputStream outputStream = null;
try {
outputStream = response.getOutputStream();
// render the captcha challenge as a JPEG image in the response
response.setHeader("Cache-Control", "no-store");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
JPEGImageEncoder encoder = JPEGCodec
.createJPEGEncoder(outputStream);
encoder.encode(image);
outputStream.flush();
outputStream.close();
outputStream = null;// no close twice
} catch (IOException ex) {
log.error("产生图片异常 ＝＝ " + ex);
throw ex;
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException ex) {
}
}
imageCaptcha.disposeChallenge();
}
}
public boolean validateCaptchaResponse(String validateCode,
HttpSession session) {
boolean flag = true;
try {
imageCaptcha = (ImageCaptcha) session.getAttribute("imageCaptcha");
if (imageCaptcha == null) {
// log.info("validateCaptchaResponse returned false due to
// imageCaptcha is null");
flag = false;
}
//validateCode = validateCode.toLowerCase();// use upper case for
validateCode = validateCode.toUpperCase();// use upper case for
// easier usage
flag = (imageCaptcha.validateResponse(validateCode)).booleanValue();
session.removeAttribute("imageCaptcha");
return flag;
} catch (Exception ex) {
ex.printStackTrace();
log.error("校验码校验异常 ＝＝ " + ex);
return false;
}
}
}