java获取电脑mac物理地址

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

public static void main(String[] args) throws UnknownHostException, SocketException {
  // TODO Auto-generated method stub

  //得到IP，输出PC-201309011313/122.206.73.83
  InetAddress ia = InetAddress.getLocalHost();
  System.out.println(ia);
  getLocalMac(ia);
}

private static void getLocalMac(InetAddress ia) throws SocketException {
  // TODO Auto-generated method stub
  //获取网卡，获取地址
  byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();
  System.out.println("mac数组长度："+mac.length);
  StringBuffer sb = new StringBuffer("");
  for(int i=0; i<mac.length; i++) {
    if(i!=0) {
      sb.append("-");
    }
    //字节转换为整数
    int temp = mac[i]&0xff;
    String str = Integer.toHexString(temp);
    System.out.println("每8位:"+str);
    if(str.length()==1) {
      sb.append("0"+str);
    }else {
      sb.append(str);
    }
  }
  System.out.println("本机MAC地址:"+sb.toString().toUpperCase());
}