JAVA得到网卡物理地址

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;

/**
 *
 *  @author  hadeslee
  */
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());
    }
}