[Java]Network Interface の一覧を表示する

NetworkInterface クラスの getNetworkInterfaces メソッドで Network Interface の一覧が取得できる
Example: java_net_04.java

// ネットワーク I/F を表示する
import java.net.*;
import java.util.Enumeration;

public class java_net_04 {
        public static void main(String[] args) {
                try {
                        // Network Interface のリスト
                        Enumeration enuIfs = NetworkInterface.getNetworkInterfaces();
                        while (enuIfs.hasMoreElements()) {
                                NetworkInterface ni = (NetworkInterface)enuIfs.nextElement();
                                System.out.println("Names: " + ni.getName() + " / " + ni.getDisplayName());
                                byte hwAddr[] = ni.getHardwareAddress();
                                if (hwAddr != null) {
                                        System.out.print("     MAC address: ");
                                        for (byte segment: hwAddr) {
                                                System.out.printf("%02x ", segment);
                                        }
                                        System.out.println();
                                }

                                Enumeration ipaddrs = ni.getInetAddresses();
                                while (ipaddrs.hasMoreElements()) {
                                        InetAddress address = (InetAddress)ipaddrs.nextElement();
                                        System.out.println("     Address: " + address.getHostAddress());
                                }
                        }
                }
                catch (Exception e) {
                        System.err.println(e);
                        return;
                }
        }
}

実行結果

> javac java_net_04.java
> java java_net_04
Names: lo / MS TCP Loopback interface
     Address: 127.0.0.1
Names: eth0 / VMware Virtual Ethernet Adapter for VMnet8
     MAC address: xx xx xx xx xx xx
     Address: 192.168.153.1
Names: eth1 / VMware Virtual Ethernet Adapter for VMnet1
     MAC address: xx xx xx xx xx xx
     Address: 192.168.247.1
Names: eth2 / Intel(R) 82566DM-2 Gigabit Network Connection - ?p?P?b?g ?X?P?W
     MAC address: xx xx xx xx xx xx
     Address: 192.168.1.1