자바로 MAC address 구해보기

import java.io.*;

public class MacAddressTest { 

  public static void main(String args[]) throws Exception {
    Process process = Runtime.getRuntime().exec("ipconfig /all");

    InputStream standardOutput = process.getInputStream(), standardError = 
        process.getErrorStream() ; 

    String output = ""; 
    int c;

    while ((c = standardOutput.read()) != -1) { 

      output = output + new Character((char)c).toString(); 

    } 

    while ((c = standardError.read()) != -1) 

      standardOutput.close(); 
      standardError.close(); 

      BufferedReader br = new BufferedReader(new StringReader(output));
      String line = null; 

      while ((line = br.readLine()) != null) { 
        if (line.trim().startsWith("Physical Address")) { 
          String mac = line.substring(line.indexOf(":")+1,
                       line.length()).trim(); 

          System.out.println("MAC Address : " + mac); 
        } 
     } 
  } 
}