redisTemplate设置key零点过期，生成自增的单号

public String getId() {
        String key = "finance:funs:code";
        Long incr = getIncr(key);
        if (incr == 0) {
            incr = getIncr(key);//从0001开始
        }
        DecimalFormat df = new DecimalFormat("0000");//四位序列号
        String format = df.format(incr);
        return format;
    }

    public Long getIncr(String key) {
        RedisAtomicLong entityIdCounter = new RedisAtomicLong(key, redisTemplate.getConnectionFactory());
        Long increment = entityIdCounter.getAndIncrement();
        Long expiresTime = getSecondsNextEarlyMorning();
        redisTemplate.opsForValue().set(key, "pay", expiresTime, TimeUnit.SECONDS);
        return increment;
    }

    /**
     * 判断当前时间距离第二天凌晨的秒数
     *
     * @return 返回值单位为[s:秒]
     */
    public Long getSecondsNextEarlyMorning() {
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.DAY_OF_YEAR, 1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return (cal.getTimeInMillis() - System.currentTimeMillis()) / 1000;
    }

key自己替换

redisTemplate.opsForValue().set(key, "pay", expiresTime, TimeUnit.SECONDS);中的pay自定义