Java查找默认网关的网络接口

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

public class DefaultGateway {
    public static void main(String[] args) {
        try {
            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
            while (networkInterfaces.hasMoreElements()) {
                NetworkInterface networkInterface = networkInterfaces.nextElement();
                Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
                while (inetAddresses.hasMoreElements()) {
                    InetAddress inetAddress = inetAddresses.nextElement();
                    if (inetAddress.isLoopbackAddress()) {
                        continue;
                    }
                    if (inetAddress.isLinkLocalAddress()) {
                        continue;
                    }
                    if (inetAddress.isMulticastAddress()) {
                        continue;
                    }
                    if (inetAddress.isAnyLocalAddress()) {
                        continue;
                    }
                    if (inetAddress.isSiteLocalAddress()) {
                        System.out.println("IP地址：" + inetAddress.getHostAddress());
                        System.out.println("子网掩码：" + networkInterface.getInterfaceAddresses().get(0).getNetworkPrefixLength());
                        System.out.println("默认网关：" + networkInterface.getInterfaceAddresses().get(0).getBroadcast().getHostAddress());
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}