验证码文本生成器

ruoyi-framework/src/main/java/com/ruoyi/framework/config/KaptchaTextCreator.java

验证码配置

ruoyi-framework/src/main/java/com/ruoyi/framework/config/CaptchaConfig.java

captchaProducer 字符串验证码
captchaProducerMath 数字验证码

验证码操作处理

ruoyi-admin/src/main/java/com/ruoyi/web/controller/common/CaptchaController.java

资料

若依源码解析：图片验证码生成 (opens new window)