74 lines
1.8 KiB
Java
74 lines
1.8 KiB
Java
|
package com.ruoyi.web.utils;
|
|||
|
|
import java.text.SimpleDateFormat;
|
|||
|
|
import java.util.Date;
|
|||
|
|
import java.util.Random;
|
|||
|
|
|
|||
|
|
public class IdUtils {
|
|||
|
|
/**
|
|||
|
|
* 生成永不重复的订单号
|
|||
|
|
* @param startLetter 订单号开头字符串
|
|||
|
|
* @param size 订单号中随机的大写字母个数
|
|||
|
|
* @return
|
|||
|
|
*/
|
|||
|
|
public static String createOrderNo(String startLetter,int size){
|
|||
|
|
|
|||
|
|
String orderNo = null;
|
|||
|
|
|
|||
|
|
Date nowDate = new Date();
|
|||
|
|
|
|||
|
|
Random random = new Random();
|
|||
|
|
|
|||
|
|
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
|
|||
|
|
|
|||
|
|
//生成两位大写字母
|
|||
|
|
String keyArr = randomLetter(size);
|
|||
|
|
|
|||
|
|
String fourRandom = random.nextInt(9999) + "";
|
|||
|
|
|
|||
|
|
int randLength = fourRandom.length();
|
|||
|
|
|
|||
|
|
//四位随机数，不足四位的补0
|
|||
|
|
if(fourRandom.length()<4){//不足四位的随机数补充0
|
|||
|
|
for(int i=1; i<=4-randLength; i++){
|
|||
|
|
fourRandom = '0' + fourRandom;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
orderNo=startLetter+keyArr+sdf.format(nowDate)+fourRandom;
|
|||
|
|
|
|||
|
|
return orderNo;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 生成大写字母
|
|||
|
|
* @param size
|
|||
|
|
* @return
|
|||
|
|
*/
|
|||
|
|
public static String randomLetter(int size){
|
|||
|
|
String keyArr= "";
|
|||
|
|
char key = 0;
|
|||
|
|
boolean[] flag=new boolean[26]; //定义一个Boolean型数组，用来除去重复值
|
|||
|
|
for(int i=0;i<size;i++){ //通过循环为数组赋值
|
|||
|
|
Random rand=new Random();
|
|||
|
|
int index;
|
|||
|
|
do{
|
|||
|
|
index=rand.nextInt(26); //随机生成0-25的数字并赋值给index
|
|||
|
|
}while(flag[index]); //判断flag值是否为true,如果为true则重新为index赋值
|
|||
|
|
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
|
|||
|
|
flag[index]=true; //让对应的flag值为true
|
|||
|
|
|
|||
|
|
keyArr +=key;
|
|||
|
|
}
|
|||
|
|
return keyArr;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 测试
|
|||
|
|
* @param args
|
|||
|
|
*/
|
|||
|
|
public static void main(String[] args) {
|
|||
|
|
|
|||
|
|
System.out.println(createOrderNo("PO_",2));
|
|||
|
|
}
|
|||
|
|
}
|