生成验证码验证码工具类@name_verificationcode@author_terwer@date__publicclassverificationcode{privatestaticfinalstring[]randomstr={随机生成验证码@returnpublicstaticmapgetverificationcode(){returngetverificationcodewithstr(null)_}利用给定的字符串生成验证码@paramstr指定的字符串@returnpublicstat
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