【案例实战】SpringBoot整合Redis连接池生成图形验证码

1.需求背景

• 很多人都用手机注册一些网站的验证了，比如手机验证码。先填手机号，然后发一条验证码过去，输入验证码，完成验证，注册成功。为了避免自己的网站被刷，增加图形验证码。当然为了防止网站被刷还不止这一种办法。

2.Docker急速部署Redis

#创建文件夹
mkdir -p /usr/local/data/redis/data

docker run -itd --name redis -p 6379:6379 -v /usr/local/data/redis/data:/data redis:6.2.4 --requirepass 123456

3.搭建SpringBoot项目

（1）添加依赖

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.6.7version>
        <relativePath/> 
    parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>1.18.20version>
            <scope>compilescope>
        dependency>
    dependencies>

（2）创建启动主类

@SpringBootApplication
public class KaptchaApplication {
    public static void main(String[] args) {
        SpringApplication.run(KaptchaApplication.class, args);
    }
}

（3）创建yml

server:
  port: 8012
spring:
  application:
    name: kaptcha-server

（4）启动验证

4.开发图形验证码

（1）添加Maven依赖

        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.lettucegroupId>
                    <artifactId>lettuce-coreartifactId>
                exclusion>
            exclusions>
        dependency>
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
        dependency>
        
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>kaptcha-spring-boot-starterartifactId>
            <version>1.1.0version>
        dependency>

（2）yml配置Redis

  # 配置redis
  redis:
    # redis类型，jedis和lettuce
    client-type: jedis
    host: 192.168.139.101
    password: 123456
    port: 6379
    jedis:
      pool:
        # 连接池最大连接数（使用负值表示没有限制）
        max-active: 100
        # 连接池中的最大空闲连接
        max-idle: 100
        # 连接池中的最小空闲连接
        min-idle: 100
        # 连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: 60000

（3）配置CaptchaConfig

/**
 * 图形验证码配置类
 * @author lixiang
 */
@Configuration
public class CaptchaConfig {

    /**
     * 验证码配置
     * Kaptcha配置类名
     * @return
     */
    @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;
    }
}

（4）配置RedisTemplate

/**
 * redisTemplate配置类
 * @author lixiang
 */
@Configuration
public class RedisTemplateConfiguration {

    @Bean
    public RedisTemplate<Object,Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate<Object,Object> redisTemplate = new RedisTemplate<>();

        redisTemplate.setConnectionFactory(redisConnectionFactory);

        //配置序列化规则
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);

        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

        //设置key-value的序列化规则
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(jackson2JsonRedisSerializer);

        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);

        return redisTemplate;
    }

}

（5）编写Controller测试

@RestController
@RequestMapping("/kaptcha")
@Slf4j
public class KaptchaController {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private Producer captchaProducer;

    /**
     * 设置过期时间10min
     */
    private static final long CAPTCHA_CODE_EXPIRED = 60 * 1000;

    /**
     * 获取图形验证码
     * @param request
     * @param response
     */
    @GetMapping("/get_captcha")
    public void getCaptcha(HttpServletRequest request, HttpServletResponse response){
        //创建验证码内容
        String captchaText = captchaProducer.createText();
        log.info("图形验证码内容为：{}",captchaText);

        redisTemplate.opsForValue().set(getCaptchaKey(request),captchaText,CAPTCHA_CODE_EXPIRED, TimeUnit.MILLISECONDS);
        //生成图片
        BufferedImage captchaImage = captchaProducer.createImage(captchaText);
        try(ServletOutputStream outputStream = response.getOutputStream()){
            ImageIO.write(captchaImage,"jpg",outputStream);
        }catch (IOException e){
            log.error("获取流出错："+e.getMessage());
        }
    }

    /**
     * 获取图形验证码的缓存key
     * @param request
     * @return
     */
    private String getCaptchaKey(HttpServletRequest request) {
        String userAgent = request.getHeader("User-Agent");
        return "account:captcha:"+ userAgent;
    }

}

• 查看redis中的key