//獲取本地主機對象InetAddress host = InetAddress.getLocalHost();//根據ip地址或主機名獲取主機對象，以主機名獲取主機時需要DNS解析InetAddress host = InetAddress.getByName("192.168.100.124");InetAddress host = InetAddress.getByName(www.baidu.com);

host.getHostAddress();host.getHostName();

//返回數據類型為EnumerationEnumeration<NetworkInterface> enu = NetworkInterface.getNetworkInterfaces();while(enu.hasMoreElements){ NetworkInterface inet = enu.nextElement(); String intName = inet.getName();}

Enumeration<InetAddress> net_list = inet.getInetAddresses();while(net_list.hasMoreElements){ InetAddress net = net_list.nextElement(); String ip = net.getHostAddress();}

import java.net.*;import java.util.*;public class EnumDemo { public static void main(String[] args) {  try {   //獲取所有接口，并放進枚舉集合中，然后使用Collections.list()將枚舉集合轉換為ArrayList集合   Enumeration<NetworkInterface> enu = NetworkInterface.getNetworkInterfaces();   ArrayList<NetworkInterface> arr = Collections.list(enu);   for(Iterator<NetworkInterface> it = arr.iterator();it.hasNext();) {    NetworkInterface ni = it.next();    String intName = ni.getName(); //獲取接口名    //獲取每個接口中的所有ip網絡接口集合，因為可能有子接口    ArrayList<InetAddress> inets = Collections.list(ni.getInetAddresses());    for(Iterator<InetAddress> it1 = inets.iterator();it1.hasNext();) {     InetAddress inet = it1.next();     //只篩選ipv4地址，否則會同時得到Ipv6地址     if(inet instanceof Inet4Address) {      String ip = inet.getHostAddress();      System.out.printf("%-10s %-5s %-6s %-15s/n", "InetfaceName:",intName,"| IPv4:",ip);     }    }   }  } catch (SocketException s) {   s.printStackTrace();  } }}