java 记录mac地址

在Java中，可以使用InetAddress类来获取本地主机的MAC地址。以下是一个示例代码：

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

public class Main {
    public static void main(String[] args) {
        try {
            InetAddress localhost = InetAddress.getLocalHost();
            NetworkInterface networkInterface = NetworkInterface.getByInetAddress(localhost);
            byte[] macAddressBytes = networkInterface.getHardwareAddress();
            
            StringBuilder macAddress = new StringBuilder();
            for (int i = 0; i < macAddressBytes.length; i++) {
                macAddress.append(String.format("%02X%s", macAddressBytes[i], (i < macAddressBytes.length - 1) ? "-" : ""));
            }
            
            System.out.println("MAC Address: " + macAddress);
        } catch (UnknownHostException | SocketException e) {
            e.printStackTrace();
        }
    }
}

该代码首先获取本地主机的InetAddress对象，然后使用getByInetAddress()方法获取与该主机关联的网络接口。接着，通过调用getHardwareAddress()方法获取MAC地址的字节数组，最后将字节数组转换为十六进制字符串表示的MAC地址。

请注意，以上代码可能会返回多个MAC地址，因为一台主机可能会有多个网络接口