SpringBoot验证码整合

<!-- kaptcha验证码 -->
<dependency>
    <groupId>com.github.penggle</groupId>
    <artifactId>kaptcha</artifactId>
    <version>2.3.2</version>
</dependency>

@Component
public class KaptchaConfig {
    @Bean
    public DefaultKaptcha getDefaultKaptcha() {
        com.google.code.kaptcha.impl.DefaultKaptcha defaultKaptcha = new com.google.code.kaptcha.impl.DefaultKaptcha();

        Properties properties = new Properties();
        // 图片边框
        properties.setProperty("kaptcha.border", "no");
        // 边框颜色
        properties.setProperty("kaptcha.border.color", "105,179,90");
        // 字体颜色
        properties.setProperty("kaptcha.textproducer.font.color", "black");
        // 图片宽
        properties.setProperty("kaptcha.image.width", "110");
        // 图片高
        properties.setProperty("kaptcha.image.height", "40");
        // 字体大小
        properties.setProperty("kaptcha.textproducer.font.size", "30");
        //设置图片样式
        properties.setProperty("kaptcha.obscurificator.impl", "com.google.code.kaptcha.impl.WaterRipple");
        // session key
        properties.setProperty("kaptcha.session.key", "code");
        // 验证码长度
        properties.setProperty("kaptcha.textproducer.char.length", "6");
        // 字体
        properties.setProperty("kaptcha.textproducer.font.names", "黑体,宋体,楷体,微软雅黑");
        //干扰线颜色
        properties.setProperty("kaptcha.noise.color","black");

        properties.setProperty("kaptcha.textproducer.char.string","ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");

        Config config = new Config(properties);

        defaultKaptcha.setConfig(config);

        return defaultKaptcha;
    }
}

控制层

@Slf4j
@Controller
public class KaptchaController {

    @Autowired
    DefaultKaptcha defaultKaptcha;

    @RequestMapping("/defaultKaptcha")
    public void defaultKaptcha(HttpSession session, 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();
            session.setAttribute("rightCode", 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();
    }

}

<input type="text" id="tryCode" name="tryCode" value="" placeholder="验证码" autocomplete="off" ><img onclick="this.src='/defaultKaptcha?d='+new Date()*1" style="margin-right: 12px;" th:src="@{/defaultKaptcha}" alt="点击更换" >

String rightCode = (String) session.getAttribute("rightCode");
if (StringUtils.isNotBlank(tryCode) &&rightCode.equals(tryCode1){
	//登录逻辑   
}