com.github.sylphlike.framework.utils.sequence.RandomSequence Maven / Gradle / Ivy
package com.github.sylphlike.framework.utils.sequence;
import java.util.UUID;
/**
* 随机不重复序列
* time 10/09/2020 18:19 星期四 (dd/MM/YYYY HH:mm)
*
email [email protected]
* @author Gopal.pan
* @version 1.0.0
*/
public class RandomSequence {
public static String[] chars = new String[] { "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
"t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
"J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
"W", "X", "Y", "Z" };
/**
* 十位随机不重复数字序列，不到十位的前面补0
*
time 17:53 2021/1/4 (HH:mm yyyy/MM/dd)
*
email [email protected]
* @return java.lang.String
* @author Gopal.pan
*/
public static String digitalId(){
String s = UUID.randomUUID().toString();
String replace = s.replace("-", "");
int abs = Math.abs(replace.hashCode());
return String.format("%10d", abs).replace(" ", "0");
}
/**
* 8位不重复ID
*
通过随机生成32位UUID，由于UUID都为十六进制，所以将UUID分成8组，每4个为一组，然后通过模62操作，结果作为索引取出字符
*
time 17:53 2021/1/4 (HH:mm yyyy/MM/dd)
*
email [email protected]
* @return java.lang.String
* @author Gopal.pan
*/
public static String eightUuid() {
StringBuilder shortBuffer = new StringBuilder();
String uuid = UUID.randomUUID().toString().replace("-", "");
for (int i = 0; i < 8; i++) {
String str = uuid.substring(i * 4, i * 4 + 4);
int x = Integer.parseInt(str, 16);
shortBuffer.append(chars[x % 0x3E]);
}
return shortBuffer.toString();
}
}