113 lines
3.0 KiB
Java
113 lines
3.0 KiB
Java
package com.ruoyi.web.utils;
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import com.ruoyi.common.utils.uuid.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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public class IdUtils {
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/***********************************************生成永不重复的单号*********************************************/
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/**
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* 生成永不重复的单号
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* @param startLetter 订单号开头字符串
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* @param size 订单号中随机的大写字母个数
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* @return
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*/
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public static String createNo(String startLetter,int size){
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String orderNo = null;
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Date nowDate = new Date();
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Random random = new Random();
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SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
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//生成两位大写字母
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String keyArr = randomLetter(size);
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String fourRandom = random.nextInt(999) + "";
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int randLength = fourRandom.length();
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//四位随机数，不足四位的补0
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if(fourRandom.length()<3){//不足四位的随机数补充0
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for(int i=1; i<=3-randLength; i++){
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fourRandom = '0' + fourRandom;
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}
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}
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orderNo=startLetter+keyArr+sdf.format(nowDate)+fourRandom;
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return orderNo;
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}
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/**
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* 生成大写字母
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* @param size
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* @return
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*/
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public static String randomLetter(int size){
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String keyArr= "";
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char key = 0;
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boolean[] flag=new boolean[26]; //定义一个Boolean型数组，用来除去重复值
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for(int i=0;i<size;i++){ //通过循环为数组赋值
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Random rand=new Random();
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int index;
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do{
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index=rand.nextInt(26); //随机生成0-25的数字并赋值给index
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}while(flag[index]); //判断flag值是否为true,如果为true则重新为index赋值
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key=(char) (index+65); //大写字母的ASCII值为65-90，所以给index的值加上65，使其符合大写字母的ASCII值区间
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flag[index]=true; //让对应的flag值为true
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keyArr +=key;
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}
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return keyArr;
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}
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/***********************************************生成永不重复的单号*********************************************/
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/***********************************************获取随机UUID*********************************************/
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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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/***********************************************获取随机UUID*********************************************/
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/**
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* 测试
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* @param args
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*/
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public static void main(String[] args) {
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System.out.println(createNo("PO_",2));
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}
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}
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