一、kaptcha介绍
Kaptcha是谷歌放在github上的一个验证码jar包，我们可以简单配置属性实现验证码的验证功能。
kaptcha参数设置如下所示：
Constant 描述 默认值
kaptcha.border 图片边框，合法值：yes , no yes
kaptcha.border.color 边框颜色，合法值： r,g,b (and optional alpha) 或者 white,black,blue. black
kaptcha.border.thickness 边框厚度，合法值：>0 1
kaptcha.image.width 图片宽 200
kaptcha.image.height 图片高 50
kaptcha.producer.impl 图片实现类 com.google.code.kaptcha.impl.DefaultKaptcha
kaptcha.textproducer.impl 文本实现类 com.google.code.kaptcha.text.impl.DefaultTextCreator
kaptcha.textproducer.char.string 文本集合，验证码值从此集合中获取 abcde2345678gfynmnpwx
kaptcha.textproducer.char.length 验证码长度 5
kaptcha.textproducer.font.names 字体 Arial, Courier
kaptcha.textproducer.font.size 字体大小 40px.
kaptcha.textproducer.font.color 字体颜色，合法值： r,g,b 或者 white,black,blue. black
kaptcha.textproducer.char.space 文字间隔 2
kaptcha.noise.impl 干扰实现类 com.google.code.kaptcha.impl.DefaultNoise
kaptcha.noise.color 干扰颜色，合法值： r,g,b 或者 white,black,blue. black
kaptcha.obscurificator.impl 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 com.google.code.kaptcha.impl.WaterRipple
kaptcha.background.impl 背景实现类 com.google.code.kaptcha.impl.DefaultBackground
kaptcha.background.clear.from 背景颜色渐变，开始颜色 light grey
kaptcha.background.clear.to 背景颜色渐变，结束颜色 white
kaptcha.word.impl 文字渲染器 com.google.code.kaptcha.text.impl.DefaultWordRenderer
kaptcha.session.key session key KAPTCHA_SESSION_KEY
kaptcha.session.date session date KAPTCHA_SESSION_DATE
二、实现
1、引入maven依赖
<dependency><groupId>com.github.penggle</groupId><artifactId>kaptcha</artifactId><version>2.3.2</version></dependency>
2、编写配置类
1 package com.example.demo.config; 2 3 import com.google.code.kaptcha.impl.DefaultKaptcha; 4 import com.google.code.kaptcha.util.Config; 5 import org.springframework.context.annotation.Bean; 6 import org.springframework.context.annotation.Configuration; 7 8 import java.util.Properties; 9 10 /**11 * @author zsh12 * @company wlgzs13 * @create -03-10 9:3714 * @Describe CaptchaConfig配置类15 */16 @Configuration17 public class CaptchaConfig {18 19@Bean(name = "captchaProducer")20public DefaultKaptcha getKaptchaBean(){21 DefaultKaptcha defaultKaptcha=new DefaultKaptcha();22 Properties properties=new Properties();23 properties.setProperty("kaptcha.border", "yes");24 properties.setProperty("kaptcha.border.color", "105,179,90");25 properties.setProperty("kaptcha.textproducer.font.color", "blue");26 properties.setProperty("kaptcha.image.width", "125");27 properties.setProperty("kaptcha.image.height", "45");28 properties.setProperty("kaptcha.session.key", "code");29 properties.setProperty("kaptcha.textproducer.char.length", "5");30 properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");31 Config config=new Config(properties);32 defaultKaptcha.setConfig(config);33 return defaultKaptcha;34}35 36 }
3、编写controller类
package com.example.demo;import com.google.code.kaptcha.impl.DefaultKaptcha;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;/*** @author zsh* @company wlgzs* @create -03-10 9:41* @Describe Captcha测试controller*/@Controllerpublic class CaptchaController {@AutowiredDefaultKaptcha defaultKaptcha;/*** 显示验证码* @param request* @param response* @throws Exception*/@RequestMapping("/defaultKaptcha")public void defaultKaptcha(HttpServletRequest request, HttpServletResponse response) throws Exception {byte[] captchaChallengeAsJpeg = null;ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();try {//生产验证码字符串并保存到session中String createText = defaultKaptcha.createText();request.getSession().setAttribute("verifyCode", createText);//使用生产的验证码字符串返回一个BufferedImage对象并转为byte写入到byte数组中BufferedImage challenge = defaultKaptcha.createImage(createText);ImageIO.write(challenge, "jpg", jpegOutputStream);} catch (IllegalArgumentException e) {response.sendError(HttpServletResponse.SC_NOT_FOUND);return;}//定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组captchaChallengeAsJpeg = jpegOutputStream.toByteArray();response.setHeader("Cache-Control", "no-store");response.setHeader("Pragma", "no-cache");response.setDateHeader("Expires", 0);response.setContentType("image/jpeg");ServletOutputStream responseOutputStream =response.getOutputStream();responseOutputStream.write(captchaChallengeAsJpeg);responseOutputStream.flush();responseOutputStream.close();}@PostMapping("/verifyCode")public String imgverifyControllerDefaultKaptcha(Model model, HttpSession session, String verifyCode) {String captchaId = (String) session.getAttribute("verifyCode");System.out.println("验证码是：" + captchaId);System.out.println("用户输入的是：" + verifyCode);if (!captchaId.equals(verifyCode)) {System.out.println("输入错误");model.addAttribute("info", "错误的验证码");} else {System.out.println("输入正确");model.addAttribute("info", "正确");}return "/index";}@GetMapping("/")public ModelAndView test() {return new ModelAndView("index");}}
4、编写测试页面
1 -------------Kaptcha验证码2 <h1 th:text="${info}"/>3 <div>4<img alt="验证码" onclick="this.src='/defaultKaptcha?d='+new Date()*1" src="/defaultKaptcha"/>5 </div>6 <form action="/verifyCode" method="post">7<input type="text" name="verifyCode"/>8<input type="submit" value="提交"/>9 </form>
5、效果
