java中获取mac 地址

通过IP地址获取远程MAC地址:

public static String getMacAddressIP(String remotePcIP) {
  String str = "";
  String macAddress = "";
  try {
   Process pp = Runtime.getRuntime().exec("nbtstat -A " + remotePcIP);
   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) {
  }
  return macAddress;
 } 

在windows中获取MAC地址：

public class Test {
     public static void main(String[] args) {
         try {
           Process process = Runtime.getRuntime().exec("ipconfig /all");
           InputStreamReader ir = new InputStreamReader(process
                    .getInputStream());
            LineNumberReader input = new LineNumberReader(ir);
           String line;
            while ((line = input.readLine()) != null)
               if (line.indexOf("Physical Address") > 0) {
                    String MACAddr = line.substring(line.indexOf("-") - 2);
                    System.out.println("MAC address = [" + MACAddr + "]");
                }
        } catch (java.io.IOException e) {
           System.err.println("IOException " + e.getMessage());
        }
    }
} 

linux下获取ip地址：

public static byte[] getIp() throws UnknownHostException {
byte[] b = InetAddress.getLocalHost().getAddress();
Enumeration allNetInterfaces = null;
try {
allNetInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
e.printStackTrace();
}
InetAddress ip = null;
NetworkInterface netInterface = null;
while (allNetInterfaces.hasMoreElements()) {
netInterface = (NetworkInterface) allNetInterfaces.nextElement();
if (netInterface.getName().trim().equals("eth0")){
Enumeration addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
ip = (InetAddress) addresses.nextElement();
}
break;
}
}
if (ip != null && ip instanceof Inet4Address) {
return b = ip.getAddress();
}
return b;
}

NETBIOS，据说可以远程获取，且仅限于Windows主机，但我没有成功过，一跨网段就没戏。Linux下有工具nbtscan。

Process p = Runtime.getRuntime().exec("nbtscan -r " + ip);
InputStreamReader ir = new InputStreamReader(p.getInputStream());
LineNumberReader input = new LineNumberReader(ir);
for (int i = 1; i < 100; i++) {
str = input.readLine();
System.out.println(str);
if(str.startsWith(ip))
{
str=str.substring(str.lastIndexOf(" ")+1).trim();
System.out.println(str);
if(ValidMac(str))
macAddress=str.toUpperCase();
break;
}
}  

 /** 
     * 获取unix网卡的mac地址. 
     * 非windows的系统默认调用本方法获取.如果有特殊系统请继续扩充新的取mac地址方法. 
     * @return mac地址 
     */ 
    public static String getUnixMACAddress() {   
        String mac = null;   
        BufferedReader bufferedReader = null;   
        Process process = null;   
        try {   
            process = Runtime.getRuntime().exec("ifconfig eth0");// linux下的命令，一般取eth0作为本地主网卡 显示信息中包含有mac地址信息   
            bufferedReader = new BufferedReader(new InputStreamReader(process   
                    .getInputStream()));   
            String line = null;   
            int index = -1;   
            while ((line = bufferedReader.readLine()) != null) {   
                index = line.toLowerCase().indexOf("hwaddr");// 寻找标示字符串[hwaddr]   
                if (index >= 0) {// 找到了   
                    mac = line.substring(index +"hwaddr".length()+ 1).trim();// 取出mac地址并去除2边空格   
                    break;   
                }   
            }   
        } catch (IOException e) {   
            e.printStackTrace();   
        } finally {   
            try {   
                if (bufferedReader != null) {   
                    bufferedReader.close();   
                }   
            } catch (IOException e1) {   
                e1.printStackTrace();   
            }   
            bufferedReader = null;   
            process = null;   
        }   

        return mac;   
    }

这是在JDK1.6以后的好方法

public String getMacAddress(String host)   
    {   
        String mac = "";   
        StringBuffer sb = new StringBuffer();   
           
        try    
        {   
            NetworkInterface ni = NetworkInterface.getByInetAddress(InetAddress.getByName(host));   
               
            byte[] macs = ni.getHardwareAddress();   
               
            for(int i=0; i<macs.length; i++)   
            {   
                mac = Integer.toHexString(macs[i] & 0xFF);    
                   
                 if (mac.length() == 1)    
                 {    
                     mac = '0' + mac;    
                 }    
  
                sb.append(mac + "-");   
            }   
                           
        } catch (SocketException e) {   
            e.printStackTrace();   
        } catch (UnknownHostException e) {   
            e.printStackTrace();   
        }   
           
        mac = sb.toString();   
        mac = mac.substring(0, mac.length()-1);   
           
        return mac;   
    } 

jdk1.6的另一种算法

 public static void main(String[] args) {        try {            //InetAddress address = InetAddress.getLocalHost();            InetAddress address = InetAddress.getByName("192.168.46.53");            /*             * Get NetworkInterface for the current host and then read the             * hardware address.             */            NetworkInterface ni = NetworkInterface.getByInetAddress(address);            if (ni != null) {                byte[] mac = ni.getHardwareAddress();                if (mac != null) {                    /*                     * Extract each array of mac address and convert it to hexa with the                     * following format 08-00-27-DC-4A-9E.                     */                    for (int i = 0; i < mac.length; i++) {                        System.out.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : "");                    }                } else {                    System.out.println("Address doesn't exist or is not accessible.");                }            } else {                System.out.println("Network Interface for the specified address is not found.");            }        } catch (UnknownHostException e) {            e.printStackTrace();        } catch (SocketException e) {            e.printStackTrace();        }    }