java如何获取本机IP

java如何获取本机IP

import java.net.*;

public class Test6 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        InetAddress ia=null;
        try {
            ia=ia.getLocalHost();
            
            String localname=ia.getHostName();
            String localip=ia.getHostAddress();
            System.out.println("本机名称是："+ localname);
            System.out.println("本机的ip是 ："+localip);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

获取所有IPv4的IP地址：

public static List<String> getLocalIPList() {
        List<String> ipList = new ArrayList<String>();
        try {
            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
            NetworkInterface networkInterface;
            Enumeration<InetAddress> inetAddresses;
            InetAddress inetAddress;
            String ip;
            while (networkInterfaces.hasMoreElements()) {
                networkInterface = networkInterfaces.nextElement();
                inetAddresses = networkInterface.getInetAddresses();
                while (inetAddresses.hasMoreElements()) {
                    inetAddress = inetAddresses.nextElement();
                    if (inetAddress != null && inetAddress instanceof Inet4Address) { // IPV4
                        ip = inetAddress.getHostAddress();
                        ipList.add(ip);
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return ipList;
    }