//獲取本地主機對象
InetAddress host = InetAddress.getLocalHost();
//根據(jù)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(shù)據(jù)類型為Enumeration
Enumeration<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(zhuǎn)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(wǎng)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();
  }
 }
}