java获取mac地址的方法有哪些

在Java中，可以使用以下方法之一来获取MAC地址：

使用NetworkInterface类：

import java.net.NetworkInterface;import java.net.SocketException;import java.util.Enumeration;public class MacAddressUtil {public static String getMacAddress() {try {Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();while (networkInterfaces.hasMoreElements()) {NetworkInterface networkInterface = networkInterfaces.nextElement();byte[] mac = networkInterface.getHardwareAddress();if (mac != null) {StringBuilder stringBuilder = new StringBuilder();for (byte b : mac) {stringBuilder.append(String.format("%02X:", b));}if (stringBuilder.length() > 0) {stringBuilder.deleteCharAt(stringBuilder.length() - 1);}return stringBuilder.toString();}}} catch (SocketException e) {e.printStackTrace();}return null;}public static void main(String[] args) {String macAddress = getMacAddress();System.out.println(macAddress);}}

使用InetAddress类获取本地主机的IP地址，然后使用Process类执行arp -a命令，解析命令输出来获取MAC地址：

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.InetAddress;import java.net.UnknownHostException;public class MacAddressUtil {public static String getMacAddress() {String ipAddress = null;try {InetAddress inetAddress = InetAddress.getLocalHost();ipAddress = inetAddress.getHostAddress();} catch (UnknownHostException e) {e.printStackTrace();}if (ipAddress != null) {try {Process process = Runtime.getRuntime().exec("arp -a");BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));String line;while ((line = reader.readLine()) != null) {if (line.contains(ipAddress)) {int index = line.indexOf("at") + 3;return line.substring(index);}}} catch (IOException e) {e.printStackTrace();}}return null;}public static void main(String[] args) {String macAddress = getMacAddress();System.out.println(macAddress);}}

请注意，获取MAC地址可能因操作系统和网络环境而异。