package com.ycl.utils.uuid;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Random;
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/**
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* ID生成器工具类
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*
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* @author ruoyi
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*/
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public class IdUtils
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{
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private final static SimpleDateFormat FORMAT = new SimpleDateFormat("yyyyMMddHHmmss");
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/**
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* 获取随机UUID
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*
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* @return 随机UUID
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*/
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public static String randomUUID()
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{
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return UUID.randomUUID().toString();
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}
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/**
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* 简化的UUID，去掉了横线
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*
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* @return 简化的UUID，去掉了横线
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*/
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public static String simpleUUID()
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{
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return UUID.randomUUID().toString(true);
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}
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/**
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* 获取随机UUID，使用性能更好的ThreadLocalRandom生成UUID
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*
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* @return 随机UUID
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*/
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public static String fastUUID()
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{
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return UUID.fastUUID().toString();
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}
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/**
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* 简化的UUID，去掉了横线，使用性能更好的ThreadLocalRandom生成UUID
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*
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* @return 简化的UUID，去掉了横线
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*/
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public static String fastSimpleUUID()
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{
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return UUID.fastUUID().toString(true);
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}
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/**
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* 获取当前时间+随机数的编号
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*
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* @param numberNum 时间后生成几位数字，默认5
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* @return 编号
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*/
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public static String timeAddRandomNO(Integer numberNum)
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{
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if (numberNum == null || numberNum == 0 || numberNum < 3) {
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numberNum = 5;
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}
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Date now = new Date();
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String timeString = FORMAT.format(now);
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Random random = new Random();
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StringBuilder builder = new StringBuilder();
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builder.append(timeString);
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for (int i = 0; i < numberNum; i++) {
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// 生成一个0到9之间的随机数（包括0和9）
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builder.append(random.nextInt(10));
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}
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return builder.toString();
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}
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}
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