验证码工具类ValidationCodeUtils 使用这个工具类需要的jar包： ValidationCodeUtils如下：
package com.macw.util; import java.awt.Color; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.awt.image.BufferedImageOp; import java.util.ArrayList; import java.util.List; import java.util.Random; import org.patchca.background.BackgroundFactory; import org.patchca.color.ColorFactory; import org.patchca.color.RandomColorFactory; import org.patchca.filter.ConfigurableFilterFactory; import org.patchca.filter.library.AbstractImageOp; import org.patchca.filter.library.WobbleImageOp; import org.patchca.font.RandomFontFactory; import org.patchca.service.Captcha; import org.patchca.service.ConfigurableCaptchaService; import org.patchca.text.renderer.BestFitTextRenderer; import org.patchca.text.renderer.TextRenderer; import org.patchca.word.RandomWordFactory; public class ValidationCodeUtils { private static ConfigurableCaptchaService configurableCaptchaService = null; private static ColorFactory colorFactory = null; private static RandomFontFactory fontFactory = null; private static RandomWordFactory wordFactory = null; private static TextRenderer textRenderer = null; /** * 自定义验证码图片背景,主要画一些噪点和干扰线 */ private static class MyCustomBackgroundFactory implements BackgroundFactory { private Random random = new Random(); public void fillBackground(BufferedImage image) { Graphics graphics = image.getGraphics(); // 验证码图片的宽高 int imgWidth = image.getWidth(); int imgHeight = image.getHeight(); // 填充为白色背景 graphics.setColor(Color.WHITE); graphics.fillRect(0, 0, imgWidth, imgHeight); // 画100个噪点(颜色及位置随机) for (int i = 0; i < 100; i++) { // 随机颜色 int rInt = random.nextInt(255); int gInt = random.nextInt(255); int bInt = random.nextInt(255); graphics.setColor(new Color(rInt, gInt, bInt)); // 随机位置 int xInt = random.nextInt(imgWidth - 3); int yInt = random.nextInt(imgHeight - 2); // 随机旋转角度 int sAngleInt = random.nextInt(360); int eAngleInt = random.nextInt(360); // 随机大小 int wInt = random.nextInt(6); int hInt = random.nextInt(6); graphics.fillArc(xInt, yInt, wInt, hInt, sAngleInt, eAngleInt); // 画5条干扰线 if (i % 20 == 0) { int xInt2 = random.nextInt(imgWidth); int yInt2 = random.nextInt(imgHeight); graphics.drawLine(xInt, yInt, xInt2, yInt2); } } } } static { configurableCaptchaService = new ConfigurableCaptchaService(); // 颜色创建工厂,使用一定范围内的随机色 colorFactory = new RandomColorFactory(); configurableCaptchaService.setColorFactory(colorFactory); // 随机字体生成器 fontFactory = new RandomFontFactory(); fontFactory.setMaxSize(32); fontFactory.setMinSize(28); configurableCaptchaService.setFontFactory(fontFactory); // 随机字符生成器,去除掉容易混淆的字母和数字,如o和0等 wordFactory = new RandomWordFactory(); wordFactory.setCharacters("abcdefghkmnpqstwxyz23456789"); wordFactory.setMaxLength(5); wordFactory.setMinLength(4); configurableCaptchaService.setWordFactory(wordFactory); // 自定义验证码图片背景 MyCustomBackgroundFactory backgroundFactory = new MyCustomBackgroundFactory(); configurableCaptchaService.setBackgroundFactory(backgroundFactory); // 图片滤镜设置 ConfigurableFilterFactory filterFactory = new ConfigurableFilterFactory(); List<BufferedImageOp> filters = new ArrayList<BufferedImageOp>(); WobbleImageOp wobbleImageOp = new WobbleImageOp(); wobbleImageOp.setEdgeMode(AbstractImageOp.EDGE_MIRROR); wobbleImageOp.setxAmplitude(2.0); wobbleImageOp.setyAmplitude(1.0); filters.add(wobbleImageOp); filterFactory.setFilters(filters); configurableCaptchaService.setFilterFactory(filterFactory); // 文字渲染器设置 textRenderer = new BestFitTextRenderer(); textRenderer.setBottomMargin(3); textRenderer.setTopMargin(3); configurableCaptchaService.setTextRenderer(textRenderer); // 验证码图片的大小 configurableCaptchaService.setWidth(82); configurableCaptchaService.setHeight(32); } public static Captcha getCaptcha() { return configurableCaptchaService.getCaptcha(); } public static void main(String[] args) { Captcha c = getCaptcha(); System.out.println(c.getChallenge()); } }验证码的使用： 使用strurs2直接访问这个action就可以了
/** * 请求验证码 * @return */ public String ValidationCode() { // 调用工具方法获取验证码 Captcha c = ValidationCodeUtils.getCaptcha(); String validationCode = c.getChallenge(); System.out.println("validationCode = " + validationCode); setSessionAttribute("validationCode", validationCode); // BuffedImage类型对象代表一个图片 BufferedImage bi = c.getImage(); // 设置响应类型 HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("image/png"); response.setHeader("cache", "no-cache"); // 将图片通过输出流，响应回浏览器 OutputStream out; try { out = response.getOutputStream(); // 将图片bi以png格式使用out流输出 ImageIO.write(bi, "png", out); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }