I'm trying to get the MAC address of a linux system with this code:
try {
ip = InetAddress.getLocalHost();
NetworkInterface network = NetworkInterface.getByInetAddress(ip);
byte[] mac = network.getHardwareAddress();
// System.out.print("Current MAC address: ");
for (int i = 0; i < mac.length; i++) {
is = is + Integer.parseInt(
String.format("%02X%s", mac[i], (i < mac.length - 1) ? "" : ""),16);
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e) {
e.printStackTrace();
}
But it just crashes... does anyone know why?
解决方案
From your comments, clearly network is null, which means that getByInetAddress() could not find an interface with that IP address (see the JavaDocs: http://download.oracle.com/javase/1.5.0/docs/api/java/net/NetworkInterface.html#getByInetAddress(java.net.InetAddress)).
