<!--驗證碼-->
        <dependency>
            <groupId>com.github.penggle</groupId>
            <artifactId>kaptcha</artifactId>
            <version>2.3.2</version>
        </dependency>

    @Bean
    public DefaultKaptcha getDefaultKaptcha() {
        DefaultKaptcha captchaProducer 
 
= new DefaultKaptcha();
        Properties properties = new Properties();
        properties.setProperty("kaptcha.border", "yes");
        properties.setProperty("kaptcha.border.color", "105,179,90");
        properties.setProperty("kaptcha.textproducer.font.color", "blue");
        properties.setProperty(
 
"kaptcha.image.width", "220");
        properties.setProperty("kaptcha.image.height", "80");
        properties.setProperty("kaptcha.textproducer.font.size", "40");
        properties.setProperty("kaptcha.session.key", "code");
        properties.setProperty("kaptcha.textproducer.char.length", "4");
        properties.setProperty(
 
"kaptcha.textproducer.font.names", "宋體,楷體,微軟雅⿊");
        Config config = new Config(properties);
        captchaProducer.setConfig(config);
        return captchaProducer;
    }

    @Autowired
    private Producer captchaProducer;


    @PostMapping("/kaptcha")
    @ApiOperation("獲取驗證碼")
    @Authenticated(false)
    public RestResult getKaptchaImage(@RequestBody KaptchaVO vo) throws Exception {
        StringUtils.isTrueReMsg(vo.getImei()==null,"引數不正確");
        //⽣成驗證碼
        String capText = captchaProducer.createText();
        redisTemplate.opsForValue().set("imei-kaptcha:"+vo.getImei(),capText);
        //向客戶端寫出
        BufferedImage bi = captchaProducer.createImage(capText);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        ImageIO.write(bi, "jpg", stream);
        String s = Base64.getEncoder().encodeToString(stream.toByteArray());
        return  RestResult.successData("data:image/jpg;base64,"+s);
    }

        //獲取⽣成的驗證碼
        String verifyCodeExpected=null;
        Object o1 = redisTemplate.opsForValue().get("imei-kaptcha:" + request.getHeader("imei"));
        if(o1!=null){
            verifyCodeExpected=o1.toString();
        }
        String code = loginFormVO.getCode();
        StringUtils.isTrueReMsg(code == null || !code.equals(verifyCodeExpected),"驗證碼錯誤");

說明：將生成的驗證碼存放在redis，生成驗證碼圖片base64給前端展示，登入介面加上驗證碼引數，進行比對

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