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
com.github.penggle
kaptcha
2.3.2
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
*
*@authorshw*/
public class KaptchaTextCreator extendsDefaultTextCreator
{private static final String[] CNUMBERS = “0,1,2,3,4,5,6,7,8,9,10”.split(“,”);
@OverridepublicString getText()
{
Integer result= 0;
Random random= newSecureRandom();int x = random.nextInt(10);int y = random.nextInt(10);
StringBuilder suChinese= newStringBuilder();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);returnsuChinese.toString();
}
}
3.编写配置文件
@Configurationpublic classCaptchaConfig
{
@Bean(name= “captchaProducer”)publicDefaultKaptcha getKaptchaBean()
{
DefaultKaptcha defaultKaptcha= newDefaultKaptcha();
Properties properties= newProperties();//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= newConfig(properties);
defaultKaptcha.setConfig(config);returndefaultKaptcha;
}
@Bean(name= “captchaProducerMath”)publicDefaultKaptcha getKaptchaBeanMath()
{
DefaultKaptcha defaultKaptcha= newDefaultKaptcha();
Properties properties= newProperties();//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= newConfig(properties);
defaultKaptcha.setConfig(config);returndefaultKaptcha;
}
}
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 classCodeController
{
@Resource(name= “captchaProducer”)privateProducer captchaProducer;
@Resource(name= “captchaProducerMath”)privateProducer captchaProducerMath;/*** 验证码生成*/@GetMapping(value= “/captchaImage”)publicModelAndView 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：
packagecom.google.code.kaptcha;public classConstants
{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