JAVA得到网卡物理地址(windows和Linux)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Test {

    public static String getMACAddress() {

         String address = "";
         String os = System.getProperty("os.name");
         System.out.println(os);
        if (os != null) {
            if (os.startsWith("Windows")) {
                try {
                     ProcessBuilder pb = new ProcessBuilder("ipconfig", "/all");
                     Process p = pb.start();
                     BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
                     String line;
                    while ((line = br.readLine()) != null) {
                        if (line.indexOf("Physical Address") != -1) {
                            int index = line.indexOf(":");
                             address = line.substring(index + 1);
                            break;
                         }
                     }
                     br.close();
                    return address.trim();
                 } catch (IOException e) {
                    
                 }
             }else if(os.startsWith("Linux")){
                try {
                     ProcessBuilder pb = new ProcessBuilder("ifconfig");
                     Process p = pb.start();
                     BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
                     String line;
                    while((line=br.readLine())!=null){
                        int index=line.indexOf("硬件地址");
                        if(index!=-1){
                             address=line.substring(index+4);
                            break;
                         }
                     }
                     br.close();
                    return address.trim();
                 } catch (IOException ex) {
                     Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                 }
                
             }
         }
        return address;
     }

    public static void main(String[] args) {
         System.out.println("" + Test.getMACAddress());
     }
}