Get a loopback NIF. - Java Network

Java examples for Network:IP Address

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Description

Get a loopback NIF.

Demo Code


//package com.java2s;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class Main {
    public static void main(String[] argv) throws Exception {
        System.out.println(getLoopbackNIF());
    }// w w  w. j a  va2 s. c om

    /**
     * Get a loopback NIF.
     * @return a loopback NIF, <code>null</code> if not found.
     */
    // TODO support case with multiple loopback NIFs
    public static NetworkInterface getLoopbackNIF() {

        Enumeration<NetworkInterface> nets;
        try {
            nets = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException se) {
            return null;
        }

        while (nets.hasMoreElements()) {
            NetworkInterface net = nets.nextElement();
            try {
                if (net.isUp() && net.isLoopback())
                    return net;
            } catch (Throwable th) {
                // some methods throw exceptions, some return null (and they shouldn't)
                // noop, skip that interface
            }
        }

        return null;
    }
}

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