通用公共配置

生成验证码的两种方式，SpringBoot项目，下面是完整代码，直接就可以用

公共依赖

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<!-- redis 缓存 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

<!-- pool 对象池，springboot2.x以后用得是lettuce,添加连接池依赖 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
</dependency>

<!-- 方法二需要用到的jar包 -->
<dependency>
    <groupId>com.github.penggle</groupId>
    <artifactId>kaptcha</artifactId>
    <version>2.3.2</version>
</dependency>

配置 application.yml 文件

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spring:
  # redis 配置
  redis:
    # 地址
    host: localhost
    # 端口，默认为6379
    port: 6379
    # 数据库索引
    database: 0
    # 密码
    password:
    # 连接超时时间
    timeout: 10s
    lettuce:
      pool:
        # 连接池中的最小空闲连接
        min-idle: 0
        # 连接池中的最大空闲连接
        max-idle: 8
        # 连接池的最大数据库连接数
        max-active: 8
        # #连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1ms

公共常量

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/**
 * 公共常量
 */
public class ConstantCode {

    /**
     * 系统缓存常量
     */
    public static final String KAPTCHA_KEY = "ss:kaptcha";
    public static final Long REDIS_EXP_TIME = 60 * 60L;
    public static final Long KAPTCHA_EXP_TIME = 60 * 3L;

    /**
     * 验证码宽高常量
     */
    public static final Integer WIDTH = 200;
    public static final Integer HEIGHT = 55;

    /**
     * 图片后缀名称
     */
    public static final String IMG_JPG = "jpg";
    public static final String IMG_PNG = "png";
    public static final String IMG_JPEG = "jpeg";

}

Redis 序列化配置

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import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {
    
    @Bean
    @SuppressWarnings("all")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
        // 为了自己开发方便，一般直接使用 <String, Object>
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(factory);

        // Json序列化配置
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        // String 的序列化
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();

        // key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();

        return template;
    }
}

Redis 工具类

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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.Collection;
import java.util.concurrent.TimeUnit;

/**
 * Redis工具类
 */
@Component
@SuppressWarnings("all")
public class RedisUtils {

    /**
     * 日志对象
     */
    private static Logger logger = LoggerFactory.getLogger(RedisUtils.class);

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 缓存基本的对象，Integer、String、实体类等
     *
     * @param key      缓存的键值
     * @param value    缓存的值
     * @param timeout  时间
     * @param timeUnit 时间颗粒度
     */
    public <T> void setCacheObject(final String key, final T value, final Integer timeout, final TimeUnit timeUnit) {
        redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
    }

    /**
     * 获得缓存的基本对象。
     *
     * @param key 缓存键值
     * @return 缓存键值对应的数据
     */
    public <T> T getCacheObject(final String key) {
        ValueOperations<String, T> operation = redisTemplate.opsForValue();
        return operation.get(key);
    }

    /**
     * 获得缓存的基本对象列表
     *
     * @param pattern 字符串前缀
     * @return 对象列表
     */
    public Collection<String> keys(final String pattern) {
        return redisTemplate.keys(pattern);
    }

    /**
     * 删除集合对象
     *
     * @param collection 多个对象
     * @return
     */
    public long deleteObject(final Collection collection) {
        return redisTemplate.delete(collection);
    }

    /**
     * 指定缓存失效时间
     *
     * @param key  键
     * @param time 时间(秒)
     * @return
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            logger.error("RedisUtils expire(String key,long time) failure." + e.getMessage());
            return false;
        }
    }

    /**
     * 根据key 获取过期时间
     *
     * @param key 键 不能为null
     * @return 时间(秒) 返回0代表为永久有效
     */
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }

    /**
     * 判断key是否存在
     *
     * @param key 键
     * @return true 存在 false不存在
     */
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            logger.error("RedisUtils hasKey(String key) failure." + e.getMessage());
            return false;
        }
    }

    /**
     * 删除缓存
     *
     * @param key 可以传一个值 或多个
     */
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete(CollectionUtils.arrayToList(key));
            }
        }
    }

    //============================String=============================

    /**
     * 普通缓存获取
     *
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    /**
     * 普通缓存放入
     *
     * @param key   键
     * @param value 值
     * @return true成功 false失败
     */
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            logger.error("RedisUtils set(String key,Object value) failure." + e.getMessage());
            return false;
        }
    }

    /**
     * 普通缓存放入并设置时间
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒) time要大于0 如果time小于等于0 将设置无限期
     * @return true成功 false 失败
     */
    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            logger.error("RedisUtils set(String key,Object value,long time) failure." + e.getMessage());
            return false;
        }
    }
}

通用返回结果封装

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import org.springframework.http.HttpStatus;
import org.springframework.util.StringUtils;
import java.util.HashMap;

/**
 * 操作消息提醒
 */
public class Result extends HashMap<String, Object> {
    private static final long serialVersionUID = 1L;

    /**
     * 状态码
     */
    public static final String CODE_TAG = "code";

    /**
     * 返回内容
     */
    public static final String MSG_TAG = "msg";

    /**
     * 数据对象
     */
    public static final String DATA_TAG = "data";

    /**
     * 初始化一个新创建的 AjaxResult 对象，使其表示一个空消息。
     */
    public Result() {
    }

    /**
     * 初始化一个新创建的 AjaxResult 对象
     *
     * @param code 状态码
     * @param msg  返回内容
     */
    public Result(int code, String msg) {
        super.put(CODE_TAG, code);
        super.put(MSG_TAG, msg);
    }

    /**
     * 初始化一个新创建的 AjaxResult 对象
     *
     * @param code 状态码
     * @param msg  返回内容
     * @param data 数据对象
     */
    public Result(int code, String msg, Object data) {
        super.put(CODE_TAG, code);
        super.put(MSG_TAG, msg);
        if (!StringUtils.isEmpty(data)) {
            super.put(DATA_TAG, data);
        }
    }

    /**
     * 返回成功消息
     *
     * @return 成功消息
     */
    public static Result success() {
        return Result.success("操作成功");
    }

    /**
     * 返回成功数据
     *
     * @return 成功消息
     */
    public static Result success(Object data) {
        return Result.success("操作成功", data);
    }

    /**
     * 返回成功消息
     *
     * @param msg 返回内容
     * @return 成功消息
     */
    public static Result success(String msg) {
        return Result.success(msg, null);
    }

    /**
     * 返回成功消息
     *
     * @param msg  返回内容
     * @param data 数据对象
     * @return 成功消息
     */
    public static Result success(String msg, Object data) {
        return new Result(HttpStatus.OK.value(), msg, data);
    }

    /**
     * 返回错误消息
     *
     * @return
     */
    public static Result error() {
        return Result.error("操作失败");
    }

    /**
     * 返回错误消息
     *
     * @param msg 返回内容
     * @return 警告消息
     */
    public static Result error(String msg) {
        return Result.error(msg, null);
    }

    /**
     * 返回错误消息
     *
     * @param msg  返回内容
     * @param data 数据对象
     * @return 警告消息
     */
    public static Result error(String msg, Object data) {
        return new Result(HttpStatus.INTERNAL_SERVER_ERROR.value(), msg, data);
    }

    /**
     * 返回错误消息
     *
     * @param code 状态码
     * @param msg  返回内容
     * @return 警告消息
     */
    public static Result error(int code, String msg) {
        return new Result(code, msg, null);
    }

    /**
     * 方便链式调用
     *
     * @param key   键
     * @param value 值
     * @return 数据对象
     */
    @Override
    public Result put(String key, Object value) {
        super.put(key, value);
        return this;
    }
}

方法一：Graphics2D 画图实现

使用 jdk 画图 Graphics2D 生成验证码

1、验证码工具类

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import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * 验证码工具类
 */
public class VerifyCodeUtils {

    /**
     * 传入BufferedImage对象，并将生成好的验证码保存到BufferedImage中
     */
    public static String drawRandomText(BufferedImage bufferedImage, int width, int height) {
        Graphics2D graphics = (Graphics2D) bufferedImage.getGraphics();
        // 验证码背景色
        graphics.setColor(new Color(255, 255, 255));
        // 填充线条背景
        graphics.fillRect(0, 0, width, height);
        graphics.setFont(new Font("宋体,楷体,微软雅黑", Font.BOLD, 35));
        // 数字和字母的组合
        String baseNumLetter = "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        StringBuilder builder = new StringBuilder();
        // 旋转原点的 x 坐标
        int x = 40;
        String ch;
        Random random = new Random();
        for (int i = 0; i < 4; i++) {
            graphics.setColor(getRandomColor());
            //设置字体旋转角度,角度小于30度
            int degree = random.nextInt() % 30;
            int dot = random.nextInt(baseNumLetter.length());
            ch = baseNumLetter.charAt(dot) + "";
            builder.append(ch);
            //正向旋转
            graphics.rotate(degree * Math.PI / 180, x, 45);
            graphics.drawString(ch, x, 45);
            //反向旋转
            graphics.rotate(-degree * Math.PI / 180, x, 45);
            // 字母间距记录
            x += 35;
        }
        // 画干扰线
        for (int i = 0; i < 6; i++) {
            // 设置随机颜色
            graphics.setColor(getRandomColor());
            // 随机画线
            graphics.drawLine(random.nextInt(width), random.nextInt(height), random.nextInt(width), random.nextInt(height));
        }
        // 添加噪点
        for (int i = 0; i < 30; i++) {
            int x1 = random.nextInt(width);
            int y1 = random.nextInt(height);
            graphics.setColor(getRandomColor());
            graphics.fillRect(x1, y1, 2, 2);
        }
        return builder.toString();
    }

    /**
     * 随机取色
     */
    private static Color getRandomColor() {
        Random ran = new Random();
        return new Color(ran.nextInt(256), ran.nextInt(256), ran.nextInt(256));
    }
}

2、Controller 控制层

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import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Base64;
import java.util.UUID;

@RestController
public class VerificationController {

    @Autowired
    private RedisUtils redisUtils;

    /**
     * 验证码生成工具，返回图片信息
     * 适合学习练手使用，redis 呢能存在一个
     * @param response
     * @throws IOException
     */
    @GetMapping("/getImageCode")
    public void getImageCode(HttpServletResponse response) throws IOException {
        // 禁止缓存
        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");
        // 设置响应格式为png图片
        response.setContentType("image/png");
        // 生成图片验证码
        BufferedImage image = new BufferedImage(ConstantCode.WIDTH, ConstantCode.HEIGHT, BufferedImage.TYPE_INT_RGB);
        String randomText = VerifyCodeUtils.drawRandomText(image, ConstantCode.WIDTH, ConstantCode.HEIGHT);
        // 存入redis
        redisUtils.set(ConstantCode.KAPTCHA_KEY, randomText, ConstantCode.KAPTCHA_EXP_TIME);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image, ConstantCode.IMG_JPG, out);
        out.flush();
        out.close();
    }

    /**
     * 验证码 Base64
     * 可生成多个
     * @return
     */
    @GetMapping("/getCaptchaInfo")
    public Result getCaptchaInfo() {
        Result success = Result.success();
        // 生成图片验证码
        BufferedImage image = new BufferedImage(ConstantCode.WIDTH, ConstantCode.HEIGHT, BufferedImage.TYPE_INT_RGB);
        String uuid = UUID.randomUUID().toString().replace("-", "");
        // 验证码key
        String verifyKey = ConstantCode.KAPTCHA_KEY + uuid;
        String randomText = VerifyCodeUtils.drawRandomText(image, ConstantCode.WIDTH, ConstantCode.HEIGHT);
        // 存入redis
        redisUtils.set(verifyKey, randomText, ConstantCode.KAPTCHA_EXP_TIME);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return Result.error(e.getMessage());
        }
        success.put("uuid", uuid);
        success.put("img", Base64.getEncoder().encodeToString(os.toByteArray()));
        return success;
    }
}

方法二：kaptcha 依赖实现

1、验证码配置

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import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;
import static com.google.code.kaptcha.Constants.*;

/**
 * 验证码配置
 */
@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 注意：KaptchaTextCreator的路径
        properties.setProperty(KAPTCHA_TEXTPRODUCER_IMPL, "com.test.demo.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;
    }
}

2、验证码文本生成器

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import com.google.code.kaptcha.text.impl.DefaultTextCreator;
import java.util.Random;

/**
 * 验证码文本生成器
 */
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 Random();
        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、测试正码生成

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import com.google.code.kaptcha.Producer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Base64;
import java.util.UUID;

/**
 * 验证码操作处理
 */
@RestController
public class CaptchaController {
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisUtils redisUtils;

    /**
     * 文本验证码
     *
     * @return
     */
    @GetMapping("/captchaCharImage")
    public Result getCharCode() {
        Result ajax = Result.success();
        // 生成验证码
        String capText = captchaProducerMath.createText();
        String capStr = capText.substring(0, capText.lastIndexOf("@"));
        String code = capText.substring(capText.lastIndexOf("@") + 1);
        BufferedImage image = captchaProducerMath.createImage(capStr);
        // 保存验证码信息
        String uuid = UUID.randomUUID().toString().replace("-", "");
        String verifyKey = ConstantCode.KAPTCHA_KEY + uuid;
        redisUtils.set(verifyKey, code, ConstantCode.KAPTCHA_EXP_TIME);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return Result.error(e.getMessage());
        }
        ajax.put("uuid", uuid);
        ajax.put("img", Base64.getEncoder().encodeToString(os.toByteArray()));
        return ajax;
    }

    /**
     * 生成验证码
     */
    @GetMapping("/captchaMathImage")
    public Result getMathCode() {
        Result ajax = Result.success();
        // 生成验证码
        String capText = captchaProducer.createText();
        BufferedImage image = captchaProducerMath.createImage(capText);

        // 保存验证码信息
        String uuid = UUID.randomUUID().toString().replace("-", "");
        String verifyKey = ConstantCode.KAPTCHA_KEY + uuid;
        redisUtils.set(verifyKey, capText, ConstantCode.KAPTCHA_EXP_TIME);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return Result.error(e.getMessage());
        }
        ajax.put("uuid", uuid);
        ajax.put("img", Base64.getEncoder().encodeToString(os.toByteArray()));
        return ajax;
    }
}