基于Redis的Java订单ID生成工具类：日期+序列号

/**
 * @param StringRedisTemplate对象实例（StringRedisTemplate是通过spring注入的实例，redis是单线程，从而保证了存储在redis中序列号数据不会被影响）
 *  
 * 此工具类返回的订单ID为年月日加6位订单序列号，可根据业务继续扩展
 */
public class OrderIDGenerateUtil {

    public synchronized static  Long generateOrderId(StringRedisTemplate stringRedisTemplate) {
        String sequence = stringRedisTemplate.opsForHash().get("SHOP_ORDER","sequence").toString();
        String date = stringRedisTemplate.opsForHash().get("SHOP_ORDER","date").toString();
        StringBuilder sb = new StringBuilder();
        Calendar now = Calendar.getInstance();
        String month="";
        String day="";
        Integer mon= Integer.valueOf(now.get(Calendar.MONTH)) + 1;
        if(mon<10){
            month="0"+mon;
        }else{
            month=mon+"";
        }
        if(now.get(Calendar.DAY_OF_MONTH)<10){
            day="0"+now.get(Calendar.DAY_OF_MONTH);
        }else{
            day=now.get(Calendar.DAY_OF_MONTH)+"";
        }
        sb.append(now.get(Calendar.YEAR)+month+day);
        String currentdate = sb.toString();

        if (!currentdate.equalsIgnoreCase(date)) {
            stringRedisTemplate.opsForHash().put("SHOP_ORDER", "date", currentdate);