get-unique-id-by-redis.java

// 通过redis自增key获取全局唯一ID，每天重置  
public String getUniqueId(String key) {
      RedisScript<Long> luaScript = new DefaultRedisScript<>(
              "local exists = redis.call('EXISTS', KEYS[1])\n" +
                      "if exists == 0 then\n" +
                      "    redis.call('INCR', KEYS[1])\n" +
                      "    redis.call('PEXPIRE', KEYS[1], ARGV[1])\n" +
                      "    return tonumber(1)\n" +
                      "else\n" +
                      "    return tonumber(redis.call('INCR', KEYS[1]))\n" +
                      "end", Long.class);
      LocalDateTime midnight = LocalDateTime.now().plusDays(1).withHour(0).withMinute(0).withSecond(0).withNano(0);
      Integer millSeconds = Math.toIntExact(ChronoUnit.MILLIS.between(LocalDateTime.now(), midnight));
      Long id = (Long) redisTemplate.execute(luaScript, Collections.singletonList(key), millSeconds);
      return String.format("%08d", id);
  }