利用java如何根据IP获取mac地址

import java.net.InetAddress;import java.net.NetworkInterface;import java.net.SocketException;import java.net.UnknownHostException;public class MacAddress {  public static void main(String[] args) throws UnknownHostException, SocketException { 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()); }}