springboot~ 多节点应用里的雪花算法唯一性

apiVersion: apps/v1kind: Deploymentmetadata:  name: my-appspec:  replicas: 3  selector:    matchLabels:      app: my-app  template:    metadata:      labels:        app: my-app    spec:      containers:      - name: my-container        image: my-image:latest        env:        - name: POD_NAME          valueFrom:            fieldRef:              fieldPath: metadata.name  # 获取当前 Pod 的名称

public static int stringToNumber(String input) {        // 使用CRC32计算字符串的哈希值        CRC32 crc = new CRC32();        byte[] bytes = input.getBytes(StandardCharsets.UTF_8);        crc.update(bytes);                // 获取哈希值并限制在0到1023之间        long hashValue = crc.getValue();        return (int) (hashValue % 1024);    }

/**	 * 获取机器码.	 * @return	 */	public static String getUniqueMachineId() {		StringBuilder uniqueId = new StringBuilder();
		try {			// 获取本机的IP地址			InetAddress localHost = InetAddress.getLocalHost();			uniqueId.append(localHost.getHostAddress()).append("_");
			// 获取网络接口并获取MAC地址			Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();			while (networkInterfaces.hasMoreElements()) {				NetworkInterface networkInterface = networkInterfaces.nextElement();				byte[] mac = networkInterface.getHardwareAddress();				if (mac != null) {					for (int i = 0; i < mac.length; i++) {						uniqueId.append(String.format("%02X", mac[i]));						if (i < mac.length - 1) {							uniqueId.append("-");						}					}					uniqueId.append("_");				}			}
			// 添加系统信息作为补充			String osName = System.getProperty("os.name");			String osVersion = System.getProperty("os.version");			String userName = System.getProperty("user.name");			uniqueId.append(osName).append("_").append(osVersion).append("_").append(userName);
		}		catch (Exception e) {			e.printStackTrace();		}
		return uniqueId.toString();	}

@Slf4jpublic class IdUtils {
	static SnowFlakeGenerator snowFlakeGenerator;
	public static String generateId() {		if (snowFlakeGenerator == null) {			long podNameCode = stringToNumber(Optional.ofNullable(System.getenv("POD_NAME")).orElse(stringToNumber(getUniqueMachineId())));			log.debug("podNameCode:{}", podNameCode);			snowFlakeGenerator = new SnowFlakeGenerator(podNameCode);
		}		return snowFlakeGenerator.hexNextId();	}