创建验证码工具类（源码）

/* * Copyright (c) JForum Team * All rights reserved. * * Redistribution and use in source and binary forms, * with or without modification, are permitted provided * that the following conditions are met: * * 1) Redistributions of source code must retain the above * copyright notice, this list of conditions and the * following disclaimer. * 2) Redistributions in binary form must reproduce the * above copyright notice, this list of conditions and * the following disclaimer in the documentation and/or * other materials provided with the distribution. * 3) Neither the name of "Rafael Steil" nor * the names of its contributors may be used to endorse * or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER * IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE * * This file creation date: Nov 13, 2004 / 17:17:09 * The JForum Project * http://www.jforum.net */ import java.awt.Color; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import javax.imageio.ImageIO; 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.TwistedAndShearedRandomFontGenerator; import com.octo.captcha.component.image.textpaster.RandomTextPaster; 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.wordgenerator.RandomWordGenerator; import com.octo.captcha.component.wordgenerator.WordGenerator; import com.octo.captcha.engine.image.ListImageCaptchaEngine; import com.octo.captcha.image.ImageCaptchaFactory; import com.octo.captcha.image.gimpy.GimpyFactory; /** * @author James Yong * @version $Id: Captcha.java,v 1.13 2007/08/06 15:38:01 rafaelsteil Exp $ */ public class Captcha extends ListImageCaptchaEngine { private static Captcha classInstance; private CaptchaStyle style; public Captcha() { this(null); } public Captcha(CaptchaStyle style) { super(); this.style = style; buildInitialFactories(); } public static void setCaptcha(Captcha classInstance) { Captcha.classInstance = classInstance; } public static Captcha getInstance() { return classInstance; } public CaptchaStyle getStyle() { return style; } protected void buildInitialFactories() { if (style == null) { style = new CaptchaStyle(); } List<GradientBackgroundGenerator> backgroundGeneratorList = new ArrayList<GradientBackgroundGenerator>(); List<RandomTextPaster> textPasterList = new ArrayList<RandomTextPaster>(); List<TwistedAndShearedRandomFontGenerator> fontGeneratorList = new ArrayList<TwistedAndShearedRandomFontGenerator>(); int width = style.width; int height = style.height; int minWords = style.minWords; int maxWords = style.maxWords; int minFontSize = style.minFontSize; int maxFontSize = style.maxFontSize; backgroundGeneratorList.add(new GradientBackgroundGenerator( new Integer(width), new Integer(height), Color.PINK, Color.LIGHT_GRAY)); backgroundGeneratorList .add(new GradientBackgroundGenerator(new Integer(width), new Integer(height), Color.WHITE, Color.RED)); backgroundGeneratorList.add(new GradientBackgroundGenerator( new Integer(width), new Integer(height), Color.ORANGE, Color.LIGHT_GRAY)); backgroundGeneratorList.add(new GradientBackgroundGenerator( new Integer(width), new Integer(height), Color.CYAN, Color.LIGHT_GRAY)); // this.backgroundGeneratorList.add(new FunkyBackgroundGenerator(new // Integer(250), new Integer(50))); textPasterList.add(new RandomTextPaster(new Integer(minWords), new Integer(maxWords), Color.DARK_GRAY)); textPasterList.add(new RandomTextPaster(new Integer(minWords), new Integer(maxWords), Color.BLUE)); textPasterList.add(new RandomTextPaster(new Integer(minWords), new Integer(maxWords), Color.GREEN)); textPasterList.add(new RandomTextPaster(new Integer(minWords), new Integer(maxWords), Color.MAGENTA)); textPasterList.add(new RandomTextPaster(new Integer(minWords), new Integer(maxWords), Color.BLACK)); textPasterList.add(new RandomTextPaster(new Integer(minWords), new Integer(maxWords), Color.WHITE)); fontGeneratorList.add(new TwistedAndShearedRandomFontGenerator( new Integer(minFontSize), new Integer(maxFontSize))); // Create a random word generator WordGenerator words = new RandomWordGenerator(style.charsInUse); for (Iterator fontIter = fontGeneratorList.iterator(); fontIter .hasNext();) { FontGenerator fontGeny = (FontGenerator) fontIter.next(); for (Iterator backIter = backgroundGeneratorList.iterator(); backIter .hasNext();) { BackgroundGenerator bkgdGeny = (BackgroundGenerator) backIter .next(); for (Iterator textIter = textPasterList.iterator(); textIter .hasNext();) { TextPaster textPaster = (TextPaster) textIter.next(); WordToImage word2image = new ComposedWordToImage(fontGeny, bkgdGeny, textPaster); // Creates a ImageCaptcha Factory ImageCaptchaFactory factory = new GimpyFactory(words, word2image); // Add a factory to the gimpy list (A Gimpy is a // ImagCaptcha) addFactory(factory); } } } } public void writeCaptchaImage(BufferedImage image, OutputStream os, boolean isCloseOutputStream) throws IOException { if (os == null || image == null) { throw new NullPointerException(); } try { ImageIO.write(image, "jpg", os); } catch (IOException ex) { throw ex; } finally { if (isCloseOutputStream) { try { os.close(); } catch (Exception e) { } } } } }