【通过redis生成编码】生成不重复的序列号

/**
     * 生成一个序列号，每天从0开始自增
     * yyyyMMdd0001
     * @Param leftCode编号特定前缀
     * */
     
     public String getSequence(String leftCode){

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
        String dateTime = simpleDateFormat.format(new Date());
        String key = MessageFormat.format("{0}:{1}","dmv:carapplicationcode"+":"+leftCode,dateTime);
        Long autoID = redisTemplate.opsForValue().increment(key,1);
        if(autoID == 1){
            //设置 hash 值在凌晨23;59:59 清理
            Date date = Date.from(LocalDateTime.of(LocalDate.now(), LocalTime.MAX).toInstant(ZoneOffset.of("+8")));
            redisTemplate.expireAt(key,date);
        }
        String value = org.apache.commons.lang.StringUtils.leftPad(String.valueOf(autoID),3,"0");
        String code = MessageFormat.format("{0}{1}",dateTime,value);
        return leftCode+code;
    }

redis中的存储

实际的生成效果