生成纳秒级别的订单号

生成纳秒级别的订单号

package com.example.core.mydemo.orderno;

import java.util.Random;

public class Test{
    /**
     * 生成纳秒级别的订单号
     *
     * @return
     */
    public static String getOrderNo() {
        Long nanoTime = System.nanoTime();
        Random ra = new Random();
        String orderNum = nanoTime + ra.nextInt(1000) + "";
        return orderNum;
    }

    /**
     * orderNo=18047864311077
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("orderNo=" + getOrderNo());
    }
}