为什么写这个呢？因为前几天看见网上有采用windows命令获取局域网和广域网MAC，查了查可以直接用JDK的方法。

         MAC可用于局域网验证，提高安全性。

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.net.SocketException;

import java.net.UnknownHostException;

/*

 * 物理地址是48位，别和ipv6搞错了

 */

public class LOCALMAC {

	/**

	 * @param args

	 * @throws UnknownHostException 

	 * @throws SocketException 

	 */

	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());

	}

}

        运行结果如下：

PC-201309011313/122.206.73.83

mac数组长度：6

每8位:d0

每8位:27

每8位:88

每8位:1f

每8位:89

每8位:51

本机MAC地址:D0-27-88-1F-89-51