package com.qxueyou.scc.base.util;
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public class UserCodeUtils {
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public static final String allChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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// 0 - 9 对应ascii值为 48 --> 57
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// A - Z 对应ascii值为 65 --> 90
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// a - z 对应ascii值为 97 --> 122
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public static void main(String[] args) {
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long index = 56800235585L ;
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generateCode(6,index);
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}
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/**
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* 生成code
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* @param length
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* @param index
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* @return
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*/
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public static String generateCode(int length,long index){
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String code = "";
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int[] allIndex = generateCodeIndex(length,index);
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for(int i = 0 ; i < length; i++) {
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code = code + allChars.charAt(allIndex[5-i]);
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}
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return code ;
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}
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/**
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* 生成每个位置上的序号
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* @param length
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* @param index
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* @return
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*/
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private static int[] generateCodeIndex(int length,long index){
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int[] result = new int[]{0,0,0,0,0,0};
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for(int loopTime = 0 ; loopTime < length ; loopTime ++ ){
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result[loopTime] = (int)(index % 62) ;
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index = index / 62 ;
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}
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return result ;
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}
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}
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