Question

i am using NetworkInterface class to get the MAC address but i am getting null in my code NetworkInterface ni = NetworkInterface.getByInetAddress(inetAddr); .I am getting null in ni object,pleas suggest me the way to get the mac address of a device on lan.

Thanks in advance.

Answer 1

Try this code,

import java.io.*;
import java.net.*;
import java.util.*;
import java.util.regex.*;

public class GetMac
{
public static void main(String[] args)
throws IOException
{
String address = new GetMac().getMacAddress();
System.out.println(address);
}

public String getMacAddress() throws IOException
{
String macAddress = null;
String command = "ipconfig /all";
Process pid = Runtime.getRuntime().exec(command);
BufferedReader in =
new BufferedReader(
new InputStreamReader(pid.getInputStream()));
while (true) {
String line = in.readLine();
if (line == null)
break;
Pattern p = Pattern.compile(".*Physical Address.*: (.*)");
Matcher m = p.matcher(line);
if (m.matches()) {
macAddress = m.group(1);
break;
}
}
in.close();
return macAddress;
}
}