java - 我如何检查IP是否在java中存在？

Question

我的网络中有 5 台 IP 地址不同的设备。我希望连接到这些设备并在它们在我的网络中可用时通过 TCP/IP 套接字从它们获取数据。 我如何检查它们在 Java 中是否可用？

public void setUpConnection() {
    try {
        Socket client = new Socket(hostIp, hostPort);
        socketReader = client.getInputStream();
        socketWriter = new PrintWriter(client.getOutputStream());
    } catch (UnknownHostException e) {
        System.out.println("Error setting up socket connection: unknown host at " +   hostIp);
        System.out.println("host: " + hostIp + "port: " + hostPort);
    } catch (IOException e) {
        System.out.println("Error setting up socket connection: " + e);
        System.out.println("host: " + hostIp + "port:" + hostPort);
    }
}

Answer 1

InetAddress.getByName(host).isReachable(timeOut);

进一步引用 here