如何在Java中获取本地IP地址 Java获取IP和主机名的方法

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class IPUtil {

    public static String getLocalIpAddress() throws SocketException {
        try {
            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
            while (networkInterfaces.hasMoreElements()) {
                NetworkInterface networkInterface = networkInterfaces.nextElement();
                // 排除回环地址、虚拟网卡和未激活的网卡
                if (networkInterface.isLoopback() || networkInterface.isVirtual() || !networkInterface.isUp()) {
                    continue;
                }

                Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
                while (inetAddresses.hasMoreElements()) {
                    InetAddress inetAddress = inetAddresses.nextElement();
                    if (!inetAddress.isLoopbackAddress() && inetAddress.getHostAddress().indexOf(":") == -1) {
                        return inetAddress.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            throw new SocketException("Failed to get local IP address", e);
        }
        return null; // 如果没有找到合适的IP地址，返回null
    }

    public static void main(String[] args) {
        try {
            String ipAddress = getLocalIpAddress();
            if (ipAddress != null) {
                System.out.println("Local IP address: " + ipAddress);
            } else {
                System.out.println("Could not find a suitable IP address.");
            }
        } catch (SocketException e) {
            System.err.println("Error getting IP address: " + e.getMessage());
        }
    }
}

import java.net.InetAddress;
import java.net.UnknownHostException;

public class HostnameUtil {

    public static void main(String[] args) {
        try {
            InetAddress localHost = InetAddress.getLocalHost();
            String hostname = localHost.getHostName();
            System.out.println("Hostname: " + hostname);
        } catch (UnknownHostException e) {
            System.err.println("Could not get hostname: " + e.getMessage());
        }
    }
}

import java.net.InetAddress;
import java.net.Socket;

public class DockerUtil {

    public static String getHostIpAddress() {
        try (Socket socket = new Socket("host.docker.internal", 8080)) { // 假设宿主机8080端口开放
            return socket.getLocalAddress().getHostAddress();
        } catch (Exception e) {
            // 处理异常
            return null;
        }
    }

    public static void main(String[] args) {
        String hostIp = getHostIpAddress();
        if (hostIp != null) {
            System.out.println("Host IP Address: " + hostIp);
        } else {
            System.out.println("Could not determine Host IP Address.");
        }
    }
}