java 获取mac地址

public class MacAddressAPI {
    
    
	/**
     * 获取当前操作系统名称. return 操作系统名称 例如:windows xp,linux 等.
     */
    public static String getOSName() {
    
    
        return System.getProperty("os.name").toLowerCase();
    }

    /**
     * 获取unix网卡的mac地址. 非windows的系统默认调用本方法获取
     *
     * @return mac地址
     */
    public static String getUnixMACAddress() {
    
    
        String mac = null;
        BufferedReader bufferedReader = null;
        Process process = null;
        try {
    
    
            // linux下的命令，一般取eth0作为本地主网卡
            process = Runtime.getRuntime().exec("ifconfig eth0");
            // 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) {
    
    
                // 寻找标示字符串[hwaddr]
                index = line.toLowerCase().indexOf("hwaddr");
                if (index >= 0) {
    
    // 找到了
                    // 取出mac地址并去除2边空格
                    mac = line.substring(index + "hwaddr".length() + 1).trim();
                    break;
                }
            }
        }
        catch (IOException e) {
    
    
            System.out.println("unix/linux方式未获取到网卡地址");
        }
        finally {
    
    
            try {
    
    
                if (bufferedReader != null) {
    
    
                    bufferedReader.close();
                }
            }
            catch (IOException e1) {
    
    
                e1.printStackTrace();
            }
            bufferedReader = null;
            process = null;
        }
        return mac;
    }

    /**
     * 获取widnows网卡的mac地址.
     *
     * @return mac地址
     */
    public static String getWindowsMACAddress() {
    
    
        String mac = null;
        BufferedReader bufferedReader = null;
        Process process = null;
        try {
    
    
            // windows下的命令，显示信息中包含有mac地址信息
            process = Runtime.getRuntime().exec("ipconfig /all");
            bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line = null;
            int index = -1;
            while ((line = bufferedReader.readLine()) != null) {
    
    
                // 寻找标示字符串[physical
                index = line.toLowerCase().indexOf("physical address");
                if (index >= 0) {
    
    // 找到了
                    index = line.indexOf(":");// 寻找":"的位置
                    if (index >= 0) {
    
    
                        // 取出mac地址并去除2边空格
                        mac = line.substring(index + 1).trim();
                    }
                    break;
                }
            }
        }
        catch (IOException e) {
    
    
            System.out.println("widnows方式未获取到网卡地址");
        }
        finally {
    
    
            try {
    
    
                if (bufferedReader != null) {
    
    
                    bufferedReader.close();
                }
            }
            catch (IOException e1) {
    
    
                e1.printStackTrace();
            }
            bufferedReader = null;
            process = null;
        }
        return mac;
    }

    /**
     * windows 7 专用 获取MAC地址
     *
     * @return
     * @throws Exception
     */
    public static String getWindows7MACAddress() {
    
    
        StringBuffer sb = new StringBuffer();
        try {
    
    
            // 获取本地IP对象
            InetAddress ia = InetAddress.getLocalHost();
            // 获得网络接口对象（即网卡），并得到mac地址，mac地址存在于一个byte数组中。
            byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();
            // 下面代码是把mac地址拼装成String
            for (int i = 0; i < mac.length; i++) {
    
    
                // mac[i] & 0xFF 是为了把byte转化为正整数
                String s = Integer.toHexString(mac[i] & 0xFF);
                sb.append(s.length() == 1 ? 0 + s : s);
            }
        }
        catch (Exception ex) {
    
    
            System.out.println("windows 7方式未获取到网卡地址");
        }
        return sb.toString();
    }

    /**
     * 获取MAC地址
     *
     * @throws Exception
     */
    public static String getMACAddress() {
    
    
        // windows
        String mac = getWindowsMACAddress();
        // windows7
        if (isNull(mac)) {
    
    
            mac = getWindows7MACAddress();
        }
        // unix
        if (isNull(mac)) {
    
    
            mac = getUnixMACAddress();
        }

        if (!isNull(mac)) {
    
    
            mac = mac.replace("-", "");
        }
        else {
    
    
            mac = "ABCDEFGHIJ";
        }
        return mac.toLowerCase();
    }

    public static boolean isNull(Object strData) {
    
    
        if (strData == null || String.valueOf(strData).trim().equals("")) {
    
    
            return true;
        }
        return false;
    }
}