机器码工具类-MachineUtils

MachineUtils

@Service
@Slf4j
public class MachineUtils {

    public static volatile long machineId = 0;

    @PostConstruct
    public void init() {
        getMachineId();
    }

    public static long getMachineId() {
        if (machineId == 0) {
            machineId = Math.abs((CmdUtils.getHost()+getIP()).hashCode());
            if (machineId == 0) {
                machineId = SnowFlakeIdService.nextId();
            }
        }
        return machineId;
    }

    public static String getIP() {
        InetAddress address = null;
        try {
            address = InetAddress.getLocalHost();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        String ip = address == null ? "" : address.getHostAddress();
        log.info("getIP:{}",ip);
        return ip; //返回IP地址
    }
}

CmdUtils

@Slf4j
public class CmdUtils {

    private static String runCmd(String runCmd) {
        String cmdResult = "";
        Runtime runtimeInstance = Runtime.getRuntime();
        Process runProcess;
        try {
            runProcess = runtimeInstance.exec(runCmd);
        } catch (IOException e) {
            log.error("failed to run cmd: " + runCmd, e);
            return cmdResult;
        }
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(runProcess.getInputStream()));
        try {
            while (true) {
                String inputLine = bufferedReader.readLine();
                if (inputLine == null) {
                    break;
                }
                cmdResult += inputLine;
            }
            bufferedReader.close();
        } catch (IOException e) {
            log.error("failed to get cmd result: " + runCmd, e);
        }
        return cmdResult;
    }

    public static String getHost() {
        String hostname = runCmd("hostname");
        log.info("getHost:{}",hostname);
        return hostname;
    }
}