JAVA 生成不重复订单号 优化版本 订单号格式为yyyymmdd后面自增

博主提供的开源组件 Mybatis-JPA 组件开源地址 https://gitee.com/shuaizai88/jack_mybatis_jpa

@Service("orderNumberDubbboServiceImpl")
public class OrderNumberDubbboServiceImpl implements OrderNumberDubbboService
{
    private static Logger LOG = Logger.getLogger(OrderNumberDubbboServiceImpl.class);

    private static final Integer ONCE_ORDER_NUM_CREATE =
        ConverterUtils.toInt(EConfig.getOtherConfigPropertiesValue("once_order_num_create"), 10);

    /**
     * redis锁操作service
     */
    @Resource(name = "redisLockServiceImpl")
    private RedisLockService redisLockService;

    @Resource(name = "redisCacheServiceImpl")
    private RedisCacheService redisCacheService;

    /**
     * 预先 产生很多订单号 key订单号类型value 预先生产出来的订单号
     */
    private Map> orderNumberQueueMap = new ConcurrentHashMap<>();

    public synchronized String getOneOrderNumber(String type)
    {
        ConcurrentLinkedQueue orderNumbers = null;
        orderNumbers = orderNumberQueueMap.get(type);
        // 如果有这个类型 并且还有剩余的订单号
        if (orderNumberQueueMap.containsKey(type) && (!orderNumbers.isEmpty()))
        {
            return orderNumbers.poll();
        }
        initOrderNumber(type);
        orderNumbers = orderNumberQueueMap.get(type);
        return orderNumbers.poll();
    }

    /**
     * 初始化指定类型的订单号
     *
     * @param type 类型
     */
    private synchronized void initOrderNumber(String type)
    {

        // 锁表(用于判断现在是否可以创建订单)一小时的超时时间
        if (!redisLockService.addRedisLock("REDIS_LOCK_MAX_ORDER_NUMBER", 2000, 2))
        {
            LOG.infoMsg("获取订单编号失败，订单编码类型为:{}", type);
            throw new CheckException(PubResult.SYSTEM_BUSY.asResult());
        }
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        String date = (new SimpleDateFormat("yyyyMMdd")).format(calendar.getTime());
        String key = "order_number_" + date + "_" + type;
        // key：常量+日期+订单号 value(orderIndex):日期拼接数据
        Integer orderIndex = redisCacheService.get(key);

        orderIndex = orderIndex == null ? 0 : orderIndex;
        int minOrderIndex = orderIndex + 1;
        // 每次产生1w个订单号
        orderIndex += ONCE_ORDER_NUM_CREATE;
        redisCacheService.put(key, orderIndex);
        redisLockService.delRedisLock("REDIS_LOCK_MAX_ORDER_NUMBER");
        ConcurrentLinkedQueue orderNumbers =
            orderNumberQueueMap.containsKey(type) ? orderNumberQueueMap.get(type) : new ConcurrentLinkedQueue<>();
        orderNumberQueueMap.put(type, orderNumbers);
        for (int i = minOrderIndex; i <= (ONCE_ORDER_NUM_CREATE + minOrderIndex); i++)
        {
            orderNumbers.offer(StringUtil.formatOrderNumber(date, i));
        }

    }

思路是 先生成 1w个订单号扔到  队列中，然后 有需要的直接在队列取，如果取不到的话，那么在生成1w个