JAVA生成64，32位UUID密钥

     /**      * 生成lenght位的密钥      * @param lenght 可变长度的密钥      * @param ma    是否转换大小写，true大写，false小写      * @return      */     static Random random = new Random();     static String KeyValue_lenght(int lenght, boolean... ma) {         //定义一个字符串（A-Z，a-z，0-9）即62位；         String str = "zxcvbnmlkjhgfdsaqwertyuiopQWERTYUIOPASDFGHJKLZXCVBNM1234567890";         //由Random生成随机数         StringBuffer sb = new StringBuffer();         //长度为几就循环几次         for (int i = 0; i < lenght; ++i) {             //产生0-61的数字             int number = random.nextInt(62);             //将产生的数字通过length次承载到sb中             sb.append(str.charAt(number));         }         //将承载的字符转换成字符串         return ma.length != 0 ? ma[0] ? sb.toString().toUpperCase() : sb.toString().toLowerCase() : sb.toString();     }      public static void main(String[] args) {         System.out.println(KeyValue_lenght(64));         System.out.println(KeyValue_lenght(64, true));         System.out.println(KeyValue_lenght(64, false));     }

文章来源: https://blog.csdn.net/qq_41426326/article/details/97256835