SpringBoot 2.x 集成kaptcha生成图形验证码

Kaptcha 框架介绍 谷歌开源的一个可高度配置的实用验证码生成工具

• 验证码的字体/大小/颜色
• 验证码内容的范围(数字，字母，中文汉字！)
• 验证码图片的大小，边框，边框粗细，边框颜色
• 验证码的干扰线
• 验证码的样式(鱼眼样式、3D、普通模糊)

集成步骤

依赖添加

使用国内baomidou二次封装的springboot整合starter

<!--验证码kaptcha依赖包-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>kaptcha-spring-boot-starter</artifactId>
    <version>1.1.0</version>
</dependency>

开发配置

@Configuration
public class CaptchaConfig {

    @Bean
    @Qualifier("captchaProducer")
    public DefaultKaptcha defaultKaptcha(){

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

    }
    
}

实现controller进行测试

@Api(tags = "通知模块")
@RestController
@RequestMapping("/api/user/v1")
@Slf4j
public class NotifyController {

    @Autowired
    private Producer captchaProducer;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private NotifyService notifyService;

    /**
     * 图形验证码有效期10分钟
     */
    private static final long CAPTCHA_CODE_EXPIRED = 60 * 1000 * 10;

    /**
     * 获取图形验证码
     * @param request
     * @param response
     */
    @ApiOperation("获取图形验证码")
    @GetMapping("captcha")
    public void getCaptcha(HttpServletRequest request, HttpServletResponse response){

        String captchaText = captchaProducer.createText();
        log.info("图形验证码:{}",captchaText);

        //存储, 设置一分钟后失效
        redisTemplate.opsForValue().set(getCaptchaKey(request),captchaText,CAPTCHA_CODE_EXPIRED, TimeUnit.MILLISECONDS);

        BufferedImage bufferedImage = captchaProducer.createImage(captchaText);
        ServletOutputStream outputStream = null;
        try {
            outputStream = response.getOutputStream();
            ImageIO.write(bufferedImage,"jpg",outputStream);
            outputStream.flush();
            outputStream.close();
        } catch (IOException e) {
            log.error("获取图形验证码异常:{}",e);
        }

    }
}