生成流水号

@Component
public class SerialNumberUtil {
    private static volatile SerialNumberUtil instance = null;

    private long workerId;   //用ip地址最后几个字节标示
    private long datacenterId = 0L; //可配置在properties中,启动时加载,此处默认先写成0
    private long sequence = 0L;
    private long workerIdBits = 8L; //节点ID长度
    private long sequenceBits = 12L; //序列号12位
    private long workerIdShift = sequenceBits; //机器节点左移12位
    private long datacenterIdShift = sequenceBits + workerIdBits; //数据中心节点左移14位
    private long sequenceMask = -1L ^ (-1L << sequenceBits); //4095
    private long lastTimestamp = -1L;

    public static SerialNumberUtil getInstance() {
        if (instance == null) {
            synchronized (SerialNumberUtil.class) {
                if (instance == null) {
                    instance = new SerialNumberUtil();
                }
            }
        }
        return instance;
    }

    /**
     * 生成流水号
     *
     * @return
     */
    

来源：CSDN

作者：灰灰的辉

链接：https://blog.csdn.net/qq_39543482/article/details/103237540