生成订单号

package com.jszc.lottery.common.utils;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 
 * 订单号生成工具，生成非重复订单号，理论上限1毫秒1000个，可扩展
 *
 */
public class MakeOrderNumUtil {
    /**
     * 锁对象，可以为任意对象
     */
    private static Object lockObj = "lockerOrder";
    /**
     * 订单号生成计数器
     */
    private static long orderNumCount = 0L;
    /**
     * 每毫秒生成订单号数量最大值
     */
    private int maxPerMSECSize = 1000;

    /**
     * 生成非重复订单号，理论上限1毫秒1000个
     */
    public String makeOrderNum() {
        // 最终生成的订单号
        String finOrderNum = "";
        synchronized (lockObj) {
            // 取系统当前时间作为订单号变量前半部分，精确到毫秒
            String nowDate = new SimpleDateFormat("HHmmssSSS").format(new Date());
            // 计数器到最大值归零，可扩展更大，目前1毫秒处理峰值1000个，1秒100万
            if (orderNumCount > maxPerMSECSize) {
                orderNumCount = 0L;
            }
            // 组装订单号
            String countStr = maxPerMSECSize + orderNumCount + "";
            finOrderNum = nowDate + countStr.substring(1);
            orderNumCount++;
        }
        return finOrderNum;
    }

    public static void main(String[] args) {
        // 测试多线程调用订单号生成工具
        try {
            for (int i = 0; i < 200; i++) {
                Thread t1 = new Thread(new Runnable() {
                    public void run() {
                        MakeOrderNumUtil makeOrder = new MakeOrderNumUtil();
                        String finOrderNum = makeOrder.makeOrderNum();
                        System.out.println(finOrderNum+"zss");
                    }
                }, "at" + i);
                t1.start();
                Thread t2 = new Thread(new Runnable() {
                    public void run() {
                        MakeOrderNumUtil makeOrder = new MakeOrderNumUtil();
                        String finOrderNum = makeOrder.makeOrderNum();
                        System.out.println(finOrderNum+"zss" );
                    }
                }, "bt" + i);
                t2.start();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}