import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.LineNumberReader;public class TestMac {    public static void main(String[] args) {        System.out.println("Operation System=" + getOsName());        System.out.println("Mac Address=" + getMACAddress());        System.out.println("通过ip获取mac" + getMACAddress("*.*.*.*"));    }    public static String getOsName() {        String os = "";        os = System.getProperty("os.name");        return os;    }    public static String getMACAddress() {        String address = "";        String os = getOsName();        if (os.startsWith("Windows")) {            try {                String command = "cmd.exe /c ipconfig/all";                Process p = Runtime.getRuntime().exec(command);                BufferedReader br = new BufferedReader(new InputStreamReader(                            p.getInputStream()));                String line;                while ((line = br.readLine()) != null) {                    if (line.indexOf("Physical Address") > 0) {                        int index = line.indexOf(":");                        index += 2;                        address = line.substring(index);                        break;                    }                }                br.close();                return address.trim();            } catch (IOException e) {            }        } else if (os.startsWith("Linux")) {            String command = "/bin/sh -c ifconfig -a";            Process p;            try {                p = Runtime.getRuntime().exec(command);                BufferedReader br = new BufferedReader(new InputStreamReader(                            p.getInputStream()));                String line;                while ((line = br.readLine()) != null) {                    if (line.indexOf("HWaddr") > 0) {                        int index = line.indexOf("HWaddr") + "HWaddr".length();                        address = line.substring(index);                        break;                    }                }                br.close();            } catch (IOException e) {            }        }        address = address.trim();        return address;    }    public static String getMACAddress(String ipAddress) {        String str = "";        String strMAC = "";        String macAddress = "";        try {            Process pp = Runtime.getRuntime().exec("nbtstat -a " + ipAddress);            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) {                        strMAC = str.substring(str.indexOf("MAC Address") + 14,                                str.length());                        break;                    }                }            }        } catch (IOException ex) {            return "Can't Get MAC Address!";        }        //         if (strMAC.length() < 17) {            return "Error!";        }        macAddress = strMAC.substring(0, 2) + ":" + strMAC.substring(3, 5) +            ":" + strMAC.substring(6, 8) + ":" + strMAC.substring(9, 11) + ":" +            strMAC.substring(12, 14) + ":" + strMAC.substring(15, 17);        //         return macAddress;    }}