java使用redis实现按年流水号并发自增

另一种方法：java使用AtomicInteger实现按年流水号并发自增

1、业务需求实现流水号 编号+年份+000001，新的一年再次重新从0递增，例如 G2021000001，G2022000001

2、可以承受并发，直接上代码

 public synchronized String autoApplyId() throws Exception{
        int currentYear = Calendar.getInstance().get(Calendar.YEAR);
        //redis的key
        String applyIdKey = "apply_id_number";
        //redis的value模板，例2022000001
        String applyIdNumber = String.format(currentYear + "%06d", 1);
        //如果存在key则在原有value序号上自增+1，如到新的一年则更新value值为 新年份+000001
        if (stringRedisTemplate.hasKey(applyIdKey)) {
            String yearNumber = stringRedisTemplate.opsForValue().get(applyIdKey).substring(0, 4);
            int dataYear = Integer.parseInt(yearNumber);
            if (dataYear != currentYear)
                stringRedisTemplate.opsForValue().set(applyIdKey, applyIdNumber);
            else
                stringRedisTemplate.opsForValue().increment(applyIdKey,1);
        } else {
            //如果不存在key则直接设置value为 当前年份+000001
            stringRedisTemplate.opsForValue().set(applyIdKey, applyIdNumber);
        }
        String yearNumber = stringRedisTemplate.opsForValue().get(applyIdKey);
        String applyId = "A" + yearNumber;
        return applyId;
    }
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