Java 获得MAC地址

import java.io.*;

public class GetMac
{
//通过IP获取网卡地址
public String getMacByIP(String serverIP)
{
String str = "";
String macAddress = "";
try
{

Process pp = Runtime.getRuntime().exec("nbtstat -A "+serverIP);
InputStreamReader ir = new InputStreamReader(pp.getInputStream());
LineNumberReader input = new LineNumberReader(ir);
for(int i = 1;i < 100;i++)
{
str = input.readLine();
if(str != null)
{
if(str.indexOf("MAC Address") > 1)
{
macAddress = str.substring(str.indexOf("MAC Address")+14,str.length());
break;
}
}
}
}
catch(IOException ex)
{
ex.printStackTrace();
}
return macAddress;
}
//通过机器名获取网卡地址
public String getMacByServerName(String serverName)
{
String str = "";
String macAddress = "";
try
{

Process pp = Runtime.getRuntime().exec("nbtstat -a "+serverName);
InputStreamReader ir = new InputStreamReader(pp.getInputStream());
LineNumberReader input = new LineNumberReader(ir);
for(int i = 1;i < 100;i++)
{
str = input.readLine();
if(str != null)
{
if(str.indexOf("MAC Address") > 1)
{
macAddress = str.substring(str.indexOf("MAC Address")+14,str.length());
break;
}
}
}
}
catch(IOException ex)
{
ex.printStackTrace();
}
return macAddress;
}

public static void main(String[] args)
{
GetMac getmac;
getmac=new GetMac();
String mac="";
mac=getmac.getMacByIP("172.16.0.1");
System.out.println(mac);
mac=getmac.getMacByServerName("server");
System.out.println(mac);
}
}