java获取本地mac总结（摘录整理）

方法一：

import java.net.InetAddress;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.text.ParseException;
import java.util.StringTokenizer;

public final class NetworkInfo {
    private final static String getMacAddress() throws IOException {
        String os = System.getProperty("os.name");
        try {
            if (os.startsWith("Windows")) {
                return windowsParseMacAddress(windowsRunIpConfigCommand());
            } else if (os.startsWith("Linux")) {
                return linuxParseMacAddress(linuxRunIfConfigCommand());
            } else {
                throw new IOException("unknown operating system:" + os);
            }
        } catch (ParseException ex) {
            ex.printStackTrace();
            throw new IOException(ex.getMessage());
        }
    }

    /* 
    *   Linux   stuff 
    */
    private final static String linuxParseMacAddress(String ipConfigResponse) throws ParseException {
        String localHost = null;
        try {
            localHost = InetAddress.getLocalHost().getHostAddress();
        } catch (java.net.UnknownHostException ex) {
            ex.printStackTrace();
            throw new ParseException(ex.getMessage(), 0);
        }

        StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n");
        String lastMacAddress = null;

        while (tokenizer.hasMoreTokens()) {
            String line = tokenizer.nextToken().trim();
            boolean containsLocalHost = line.indexOf(localHost) >= 0;
            //   see   if   line   contains   IP   address 
            if (containsLocalHost && lastMacAddress != null) {
                return lastMacAddress;
            }
            //   see   if   line   contains   MAC   address 
            int macAddressPosition = line.indexOf("HWaddr");
            if (macAddressPosition <= 0)
                continue;

            String macAddressCandidate = line.substring(macAddressPosition + 6).trim();
            if (linuxIsMacAddress(macAddressCandidate)) {
                lastMacAddress = macAddressCandidate;
                continue;
            }
        }

        ParseException ex = new ParseException("cannot read MAC address for " + localHost
                                               + " from [" + ipConfigResponse + "]", 0);
        ex.printStackTrace();
        throw ex;
    }

    private final static boolean linuxIsMacAddress(String macAddressCandidate) {
        if (macAddressCandidate.length() != 17){
            return false;
        }
        return true;
    }

    private final static String linuxRunIfConfigCommand() throws IOException {
        Process p = Runtime.getRuntime().exec("ifconfig");
        InputStream stdoutStream = new BufferedInputStream(p.getInputStream());

        StringBuffer buffer = new StringBuffer();
        for (;;) {
            int c = stdoutStream.read();
            if (c == -1)
                break;
            buffer.append((char) c);
        }
        String outputText = buffer.toString();

        stdoutStream.close();

        return outputText;
    }

    /* 
    *   Windows   stuff 
    */
    private final static String windowsParseMacAddress(String ipConfigResponse)
                                                                               throws ParseException {
        String localHost = null;
        try {
            localHost = InetAddress.getLocalHost().getHostAddress();
        } catch (java.net.UnknownHostException ex) {
            ex.printStackTrace();
            throw new ParseException(ex.getMessage(), 0);
        }

        StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n");
        String lastMacAddress = null;

        while (tokenizer.hasMoreTokens()) {
            String line = tokenizer.nextToken().trim();
            //   see   if   line   contains   IP   address 
            if (line.endsWith(localHost) && lastMacAddress != null) {
                return lastMacAddress;
            }
            //   see   if   line   contains   MAC   address 
            int macAddressPosition = line.indexOf(":");
            if (macAddressPosition <= 0)
                continue;
            String macAddressCandidate = line.substring(macAddressPosition + 1).trim();
            if (windowsIsMacAddress(macAddressCandidate)) {
                lastMacAddress = macAddressCandidate;
                continue;
            }
        }

        ParseException ex = new ParseException("cannot read MAC address from ["
                                               + ipConfigResponse + "]", 0);
        ex.printStackTrace();
        throw ex;
    }

    private final static boolean windowsIsMacAddress(String macAddressCandidate) {
        if (macAddressCandidate.length() != 17){
            return false;
        }
        return true;
    }

    private final static String windowsRunIpConfigCommand() throws IOException {
        Process p = Runtime.getRuntime().exec("ipconfig /all ");
        InputStream stdoutStream = new BufferedInputStream(p.getInputStream());
        StringBuffer buffer = new StringBuffer();
        for (;;) {
            int c = stdoutStream.read();
            if (c == -1)
                break;
            buffer.append((char) c);
        }
        String outputText = buffer.toString();
        stdoutStream.close();
        return outputText;
    }

    /* 
    *   Main 
    */
    public final static void main(String[] args) {
        try {
            System.out.println("Network infos");

            System.out.println("Operating System:" + System.getProperty("os.name"));
            System.out.println("IP/Localhost:" + InetAddress.getLocalHost().getHostAddress());
            System.out.println("MAC Address:" + getMacAddress());
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }
}

方法二：
在Unix/Linux 下通常只有root 用户才有执行ifconfig 命令的权限， 第一种方法中用调用ifconfig 命令的方法获取硬件地址可靠性不好， 普通用户无法正确获取硬件地址，该方法通过纯java的方式很好地解决了此问题

import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class MyMac {
    public static void main(String[] args) {
        try {
            //枚举所有网络接口设备
            Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
            //循环处理每一个网络接口设备
            while (interfaces.hasMoreElements()) {
                NetworkInterface face = (NetworkInterface) interfaces.nextElement();
                //环回设备（lo）设备不处理
                if (!face.getName().equals("lo")) {
                    //显示当前网络接口设备显示名称
                    System.out.println("网卡显示名称:" + face.getDisplayName());
                    //显示当前设备内部名称
                    System.out.println(" 网卡设备名称:" + face.getName());
                    // 获取硬件地址
                    byte[] mac = face.getHardwareAddress();
                    System.out.println(" 硬件地址（MAC）:" + bytes2mac(mac));
                }
            }
        } catch (SocketException se) {
            System.err.println("错误：" + se.getMessage());
        }
    }

    private static String bytes2mac(byte[] bytes) {
        //MAC 地址应为6 字节
        if (bytes.length != 6) {
            System.err.println("MAC 地址数据有错！ ");
            return null;
        }
        StringBuffer macString = new StringBuffer();
        byte currentByte;
        for (int i = 0; i < bytes.length; i++) {
            //与11110000 作按位与运算以便读取当前字节高4 位
            currentByte = (byte) ((bytes[i] & 240) >> 4);
            macString.append(Integer.toHexString(currentByte));
            //与00001111 作按位与运算以便读取当前字节低4 位
            currentByte = (byte) ((bytes[i] & 15));
            macString.append(Integer.toHexString(currentByte));
            //追加字节分隔符“-”
            macString.append("-");
        }
        //删除多加的一个“-”
        macString.delete(macString.length() - 1, macString.length());
        //统一转换成大写形式后返回
        return macString.toString().toUpperCase();
    }
}