登录-生成验证码工具

问题 : 登录所需验证码
1, 引入依赖 hutool 工具包
hutool工具官网地址

 <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>${hutool.version}</version>
  </dependency>

2,简单案例

    @ApiOperation("获取验证码")
    @GetMapping("/captchaImage")
    public R getCode(HttpServletResponse response) throws IOException {

        boolean enabled = captchaProperties.getEnabled();

        // 定义图形验证码的长和宽
        LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(116, 36,4,5);

        //code值
        String code = lineCaptcha.getCode();

        // 保存验证码信息
       	// verifyKey  作为Redis 中的key值
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

        //存入Redis,用于校验code值
        redisService.setCacheObject(verifyKey , code, 5L, TimeUnit.MINUTES);

        System.out.println(code);
        String imageBase64 ="data:image/jpg;base64,";
        imageBase64 += lineCaptcha.getImageBase64();

        return R.success().data("data",imageBase64).data("uuid", uuid).data("captchaEnabled", enabled);

    }

运行结果 :