Java利用Redis zset判断最近一段时间的调用次数

  public boolean fuck(Bo bo) {
    //maxFrequencyInterval为需要统计频率的时间间隔
    if (maxFrequencyInterval >= 0) {
      String frequencyKey = getFrequencyKey(bo);
      long now = System.currentTimeMillis();
      //删除zset中过时的元素
      stringRedisTemplate.opsForZSet().removeRangeByScore(frequencyKey, 0, now - 1000d * maxFrequencyInterval);
      Long frequency = stringRedisTemplate.opsForZSet().zCard(frequencyKey);
      //maxFrequency为这段时间间隔内能接受的最大调用次数
      if (frequency != null && frequency >= maxFrequency) {
        return false;
      }
      //key无所谓 分数是当前时间戳 用作删除条件
      stringRedisTemplate.opsForZSet().add(frequencyKey, StringUtil.EMPTY_STRING, now);
      if (frequency != null && frequency == 0) {
        //创建zset时设置过期时间
        stringRedisTemplate.expire(frequencyKey, maxFrequencyInterval * 10L, TimeUnit.SECONDS);
      }
    }
    return true;
  }