關於spring boot中圖片驗證碼

簡單的數字驗證碼相信你們都會並且也很簡單很好寫java 直接生成四位數隨機數就好了session String checkRan(){ char cha[]={'1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T

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