如何生成分布式雪花算法ID

头顶秃成一缕光

于 2025-03-20 11:17:13 发布

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文章标签： java maven java-ee intellij-idea spring cloud jvm 算法

本文链接：https://blog.youkuaiyun.com/2301_78506180/article/details/146038270

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public static long getDataCenterId(long maxDatacenterId) {
    long id = 1L;
    final byte[] mac = NetUtil.getLocalHardwareAddress();
    if (null != mac) {
        id = ((0x000000FF & (long) mac[mac.length - 2])
                | (0x0000FF00 & (((long) mac[mac.length - 1]) << 8))) >> 6;
        id = id % (maxDatacenterId + 1);
    }

    return id;
}

public static long getWorkerId(long datacenterId, long maxWorkerId) {
    final StringBuilder mpid = new StringBuilder();
    mpid.append(datacenterId);
    try {
        mpid.append(RuntimeUtil.getPid());
    } catch (UtilException igonre) {
        //ignore
    }
    return (mpid.toString().hashCode() & 0xffff) % (maxWorkerId + 1);
}