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
     
       getLocalIPList() {        List
      
        ipList = new ArrayList
       
        ();        try {            Enumeration
        
          networkInterfaces = NetworkInterface.getNetworkInterfaces();            NetworkInterface networkInterface;            Enumeration
         
           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;    }