java 记录ip和mac地址

要记录IP和MAC地址，可以使用Java的NetworkInterface类和InetAddress类来实现。下面是一个简单的示例代码：

import java.net.*;

public class IPAndMACAddress {
    public static void main(String[] args) {
        try {
            // 获取本地主机的网络接口
            NetworkInterface networkInterface = NetworkInterface.getByInetAddress(InetAddress.getLocalHost());
            
            // 获取接口的MAC地址
            byte[] mac = networkInterface.getHardwareAddress();
            StringBuilder macAddress = new StringBuilder();
            for (int i = 0; i < mac.length; i++) {
                macAddress.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
            }
            System.out.println("MAC地址: " + macAddress.toString());
            
            // 获取接口的IP地址
            Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress inetAddress = inetAddresses.nextElement();
                if (inetAddress instanceof Inet4Address) {
                    System.out.println("IPv4地址: " + inetAddress.getHostAddress());
                } else if (inetAddress instanceof Inet6Address) {
                    System.out.println("IPv6地址: " + inetAddress.getHostAddress());
                }
            }
        } catch (SocketException | UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

该代码通过NetworkInterface.getByInetAddress()方法获取本地主机的网络接口，然后使用getHardwareAddress()方法获取MAC地址。接着使用getInetAddresses()方法获取接口的IP地址，根据返回的InetAddress对象判断是IPv4还是IPv6地址，并打印出来。

请注意，获取MAC地址需要在具有网络接口的设备上运行，并且需要适当的权限。在某些情况下，可能无法获取到MAC地址或只能获取到IPv4地址