springboot+kaptcha生成数学运算验证码和字符验证码
使用以下代码只需要复制粘贴，修改一处文本生成器路径即可，文中有交代。
1.添加kaptcha依赖
<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>
2.编写验证码文本生成器，为了给数据运算验证码用的
/** * 验证码文本生成器 * * @author shw */ public class KaptchaTextCreator extends DefaultTextCreator { private static final String[] CNUMBERS = "0,1,2,3,4,5,6,7,8,9,10".split(","); @Override public String getText() { Integer result = 0; Random random = new SecureRandom(); int x = random.nextInt(10); int y = random.nextInt(10); StringBuilder suChinese = new StringBuilder(); int randomoperands = (int) Math.round(Math.random() * 2); if (randomoperands == 0) { result = x * y; suChinese.append(CNUMBERS[x]); suChinese.append("*"); suChinese.append(CNUMBERS[y]); } else if (randomoperands == 1){ if (!(x == 0) && y % x == 0){ result = y / x; suChinese.append(CNUMBERS[y]); suChinese.append("/"); suChinese.append(CNUMBERS[x]); } else { result = x + y; suChinese.append(CNUMBERS[x]); suChinese.append("+"); suChinese.append(CNUMBERS[y]); } } else if (randomoperands == 2) { if (x >= y) { result = x - y; suChinese.append(CNUMBERS[x]); suChinese.append("-"); suChinese.append(CNUMBERS[y]); } else { result = y - x; suChinese.append(CNUMBERS[y]); suChinese.append("-"); suChinese.append(CNUMBERS[x]); } } else { result = x + y; suChinese.append(CNUMBERS[x]); suChinese.append("+"); suChinese.append(CNUMBERS[y]); } suChinese.append("=?@" + result); return suChinese.toString(); } }
3.编写配置文件
@Configuration public class CaptchaConfig { @Bean(name = "captchaProducer") public DefaultKaptcha getKaptchaBean() { DefaultKaptcha defaultKaptcha = new DefaultKaptcha(); Properties properties = new Properties(); // 是否有边框 默认为true 我们可以自己设置yes，no properties.setProperty(KAPTCHA_BORDER, "yes"); // 验证码文本字符颜色 默认为Color.BLACK properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_COLOR, "black"); // 验证码图片宽度 默认为200 properties.setProperty(KAPTCHA_IMAGE_WIDTH, "160"); // 验证码图片高度 默认为50 properties.setProperty(KAPTCHA_IMAGE_HEIGHT, "60"); // 验证码文本字符大小 默认为40 properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_SIZE, "38"); // KAPTCHA_SESSION_KEY properties.setProperty(KAPTCHA_SESSION_CONFIG_KEY, "kaptchaCode"); // 验证码文本字符长度 默认为5 properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4"); // 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize) properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_NAMES, "Arial,Courier"); // 图片样式 水纹com.google.code.kaptcha.impl.WaterRipple 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy 阴影com.google.code.kaptcha.impl.ShadowGimpy properties.setProperty(KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.ShadowGimpy"); Config config = new Config(properties); defaultKaptcha.setConfig(config); return defaultKaptcha; } @Bean(name = "captchaProducerMath") public DefaultKaptcha getKaptchaBeanMath() { DefaultKaptcha defaultKaptcha = new DefaultKaptcha(); Properties properties = new Properties(); // 是否有边框 默认为true 我们可以自己设置yes，no properties.setProperty(KAPTCHA_BORDER, "yes"); // 边框颜色 默认为Color.BLACK properties.setProperty(KAPTCHA_BORDER_COLOR, "105,179,90"); // 验证码文本字符颜色 默认为Color.BLACK properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_COLOR, "blue"); // 验证码图片宽度 默认为200 properties.setProperty(KAPTCHA_IMAGE_WIDTH, "160"); // 验证码图片高度 默认为50 properties.setProperty(KAPTCHA_IMAGE_HEIGHT, "60"); // 验证码文本字符大小 默认为40 properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_SIZE, "35"); // KAPTCHA_SESSION_KEY properties.setProperty(KAPTCHA_SESSION_CONFIG_KEY, "kaptchaCodeMath"); // 验证码文本生成器 properties.setProperty(KAPTCHA_TEXTPRODUCER_IMPL, "com.qjwl.rabbitmq.config.KaptchaTextCreator"); // 验证码文本字符间距 默认为2 properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_SPACE, "3"); // 验证码文本字符长度 默认为5 properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "6"); // 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize) properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_NAMES, "Arial,Courier"); // 验证码噪点颜色 默认为Color.BLACK properties.setProperty(KAPTCHA_NOISE_COLOR, "white"); // 干扰实现类 properties.setProperty(KAPTCHA_NOISE_IMPL, "com.google.code.kaptcha.impl.NoNoise"); // 图片样式 水纹com.google.code.kaptcha.impl.WaterRipple 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy 阴影com.google.code.kaptcha.impl.ShadowGimpy properties.setProperty(KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.ShadowGimpy"); Config config = new Config(properties); defaultKaptcha.setConfig(config); return defaultKaptcha; } }
注意：
这个位置的com.qjwl.rabbitmq.config.KaptchaTextCreator路径要改成你自己的验证码文本生成器的路径。
4.编写controller层
@Controller @RequestMapping("/captcha") public class CodeController { @Resource(name = "captchaProducer") private Producer captchaProducer; @Resource(name = "captchaProducerMath") private Producer captchaProducerMath; /** * 验证码生成 */ @GetMapping(value = "/captchaImage") public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) { ServletOutputStream out = null; try { HttpSession session = request.getSession(); response.setDateHeader("Expires", 0); response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); response.addHeader("Cache-Control", "post-check=0, pre-check=0"); response.setHeader("Pragma", "no-cache"); response.setContentType("image/jpeg"); String type = request.getParameter("type"); String capStr = null; String code = null; BufferedImage bi = null; if ("math".equals(type)) { String capText = captchaProducerMath.createText(); capStr = capText.substring(0, capText.lastIndexOf("@")); code = capText.substring(capText.lastIndexOf("@") + 1); bi = captchaProducerMath.createImage(capStr); } else if ("char".equals(type)) { capStr = code = captchaProducer.createText(); bi = captchaProducer.createImage(capStr); } session.setAttribute(Constants.KAPTCHA_SESSION_KEY, code); out = response.getOutputStream(); ImageIO.write(bi, "jpg", out); out.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { if (out != null) { out.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } }
注：生成验证码的时候，已经把字符验证码或者数字运算的结果code存在session之中，键为Constants.KAPTCHA_SESSION_KEY，取得时候只要从session中取这个建即可。
Constants类是kaptcha包里面的，源码如下：
package com.google.code.kaptcha; public class Constants { public final static String KAPTCHA_SESSION_KEY = "KAPTCHA_SESSION_KEY"; public final static String KAPTCHA_SESSION_DATE = "KAPTCHA_SESSION_DATE"; public final static String KAPTCHA_SESSION_CONFIG_KEY = "kaptcha.session.key"; public final static String KAPTCHA_SESSION_CONFIG_DATE = "kaptcha.session.date"; public final static String KAPTCHA_BORDER = "kaptcha.border"; public final static String KAPTCHA_BORDER_COLOR = "kaptcha.border.color"; public final static String KAPTCHA_BORDER_THICKNESS = "kaptcha.border.thickness"; public final static String KAPTCHA_NOISE_COLOR = "kaptcha.noise.color"; public final static String KAPTCHA_NOISE_IMPL = "kaptcha.noise.impl"; public final static String KAPTCHA_OBSCURIFICATOR_IMPL = "kaptcha.obscurificator.impl"; public final static String KAPTCHA_PRODUCER_IMPL = "kaptcha.producer.impl"; public final static String KAPTCHA_TEXTPRODUCER_IMPL = "kaptcha.textproducer.impl"; public final static String KAPTCHA_TEXTPRODUCER_CHAR_STRING = "kaptcha.textproducer.char.string"; public final static String KAPTCHA_TEXTPRODUCER_CHAR_LENGTH = "kaptcha.textproducer.char.length"; public final static String KAPTCHA_TEXTPRODUCER_FONT_NAMES = "kaptcha.textproducer.font.names"; public final static String KAPTCHA_TEXTPRODUCER_FONT_COLOR = "kaptcha.textproducer.font.color"; public final static String KAPTCHA_TEXTPRODUCER_FONT_SIZE = "kaptcha.textproducer.font.size"; public final static String KAPTCHA_TEXTPRODUCER_CHAR_SPACE = "kaptcha.textproducer.char.space"; public final static String KAPTCHA_WORDRENDERER_IMPL = "kaptcha.word.impl"; public final static String KAPTCHA_BACKGROUND_IMPL = "kaptcha.background.impl"; public static final String KAPTCHA_BACKGROUND_CLR_FROM = "kaptcha.background.clear.from"; public static final String KAPTCHA_BACKGROUND_CLR_TO = "kaptcha.background.clear.to"; public static final String KAPTCHA_IMAGE_WIDTH = "kaptcha.image.width"; public static final String KAPTCHA_IMAGE_HEIGHT = "kaptcha.image.height"; }
5.测试结果,如果type=math,则是算数验证码，此时得session中得code值为8，可自行验证
如果type参数为char,则是字符验证码，所以此时得code为 4eym
