随机不重复邀请码

Posted 2022-12-28 亮亮1990

public class SerialNumberUtil
       
            /**自定义进制(0,1没有加入,容易与o,l混淆)*/
            private static char[] r = new char[] 'Q', 'w', 'E', '8', 'a', 'S', '2', 'd', 'Z', 'x', '9', 'c', '7', 'p', 'O', '5', 'i', 'K', '3', 'm', 'j', 'U', 'f', 'r', '4', 'V', 'y', 'L', 't', 'N', '6', 'b', 'g', 'H' ;
            /**自动补全组(不能与自定义进制有重复)*/
            private static char[] b = new char[] 'q', 'W', 'e', 'A', 's', 'D', 'z', 'X', 'C', 'P', 'o', 'I', 'k', 'M', 'J', 'u', 'F', 'R', 'v', 'Y', 'T', 'n', 'B', 'G', 'h' ;
            /**进制长度*/
            private static int l = r.Length;
            /**序列最小长度*/
            private static int s = 6;
            public static String toSerialNumber(long num)
           
                char[] buf = new char[32];
                int charPos = 32;

                while ((num / l) > 0)
               
                    buf[--charPos] = r[(int)(num % l)];
                    num /= l;
               
                buf[--charPos] = r[(int)(num % l)];
                String str = new String(buf, charPos, (32 - charPos));
                //不够长度的自动随机补全
                if (str.Length< s)
               
                    StringBuilder sb = new StringBuilder();
                    Random rnd = new Random();
                    for (int i = 0; i < s - str.Length; i++)
                   
                        sb.Append(b[rnd.Next(24)]);
                   
                    str += sb.ToString();
               
                return str;