如果给定的地址表示本地主机，则返回true。

/*

 *           GNU GENERAL PUBLIC LICENSE

 *              Version 2, June 1991

 *            

 * 

 *          ADDITIONAL REQUIREMENT

 *          

 * 1. If PeerfactSim.KOM is used for the evaluation in research publications, 

 * the following should be referenced: 

 * 

 * @techreport{   PWLS07,

 *    author = {Konstantin Pussep and Matthias Weinert and Nicolas Liebau and Ralf Steinmetz},

 *    title = {Flexible Framework for NAT Traversal in Peer-to-Peer Applications},

 *    month = {Nov},

 *    year = {2007},

 *    institution = {KOM - Multimedia Communications Lab, Technische Universit{\"a}t Darmstadt},

 *    address = {Merckstra{\ss}e 25, 64283 Darmstadt, Germany},

 *    number = {KOM-TR-2007-06},

 * }

 *//* from 时 代 J a v a 公 众 号*/

//package com.nowjava;

import java.net.InetAddress;


import java.net.NetworkInterface;

import java.net.SocketException;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Enumeration;


public class Main {

    /**

     * Returns true if the given address represents the local host.

     * @param addr address

     * @return true if the given address represents the local host

     */

    public static boolean isLocalAddress(InetAddress addr) {

        // has local scope?

        if (hasLocalScope(addr))

            return true;


        // compare to local addresses

        Collection<NetworkInterface> nis = getNetworkInterfaces();

        for (NetworkInterface ni : nis) {

            Enumeration<InetAddress> addresses = ni.getInetAddresses();
            /**
             from
            * 时代Java 
            **/

            while (addresses.hasMoreElements()) {

                if (addresses.nextElement().equals(addr))

                    return true;

            }

        }


        // found no equal address => its not local

        return false;

    }


    /**

     * Returns true when the given address is a local address.

     * @param addr address

     * @return true when the given address is a local address

     */

    public static boolean hasLocalScope(InetAddress addr) {

        if (addr == null)

            throw new IllegalArgumentException("Must not be null!");

        return (addr.isAnyLocalAddress() || addr.isLinkLocalAddress() || addr

                .isLoopbackAddress());

    }


    /**

     * Returns all network interfaces of this host.

     * @return all network interfaces of this host

     */

    public static Collection<NetworkInterface> getNetworkInterfaces() {

        // get network interfaces

        ArrayList<NetworkInterface> result = new ArrayList