引入kaptcha图形验证码及其配置

1、引入依赖

<!-- 图形验证码依赖 -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>kaptcha-spring-boot-starter</artifactId>
    <version>${captcha.version}（1.1.0）</version>
</dependency>

2、CaptchaConfig.java 配置类

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

@Configuration
public class CaptchaConfig {

    /**
     * 验证码配置
     * Kaptcha配置类名
     *
     * @return DefaultKaptcha
     */
    @Bean
    @Qualifier("captchaProducer")
    public DefaultKaptcha kaptcha() {

        DefaultKaptcha kaptcha = new DefaultKaptcha();
        Properties properties = new Properties();

        // properties.setProperty(Constants.KAPTCHA_BORDER, "yes");
        // properties.setProperty(Constants.KAPTCHA_BORDER_COLOR, "220,220,220");
        // properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_COLOR, "38,29,12");
        // properties.setProperty(Constants.KAPTCHA_IMAGE_WIDTH, "147");
        // properties.setProperty(Constants.KAPTCHA_IMAGE_HEIGHT, "34");
        // properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_SIZE, "25");
        // properties.setProperty(Constants.KAPTCHA_SESSION_KEY, "code");

        // 验证码个数
        properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4");
        // properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_NAMES, "Courier");
        // 字体间隔
        properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_SPACE, "8");
        // 干扰线颜色
        // properties.setProperty(Constants.KAPTCHA_NOISE_COLOR, "white");
        // 干扰实现类
        properties.setProperty(Constants.KAPTCHA_NOISE_IMPL, "com.google.code.kaptcha.impl.NoNoise");
        // 图片样式
        properties.setProperty(Constants.KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.WaterRipple");
        // 文字来源
        properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_STRING, "0123456789");

        Config config = new Config(properties);
        kaptcha.setConfig(config);

        return kaptcha;
    }

}

3、调用处代码

    // 自动装配Kaptcha配置文件
    @Autowired
    private Producer captchaProducer;

    /**
     * 验证码接口，生成验证码
     *
     * @param request  javax.servlet.http.HttpServletRequest
     * @param response javax.servlet.http.HttpServletResponse
     */
    @GetMapping("captcha")
    public void getCaptcha(HttpServletRequest request, HttpServletResponse response) {
        String captchaText = captchaProducer.createText();
        log.info("验证码内容:{}", captchaText);
        // TODO: 存储redis，配置过期时间
        //产生图片 输出流
        BufferedImage image = captchaProducer.createImage(captchaText);
        try {
            ServletOutputStream outputStream = response.getOutputStream();
            ImageIO.write(image, "jpg", outputStream);
            outputStream.flush();
            outputStream.close();
        } catch (IOException e) {
            log.error("获取流出错:{}", e.getMessage());
        }
    }