获取本地设备的IP版本4地址

/* The MIT License (MIT)


Copyright (c) 2012 Jerome Wagener


Permission is hereby granted, free of charge, to any person obtaining a copy of

this software and associated documentation files (the "Software"), to deal in

the Software without restriction, including without limitation the rights to

use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

the Software, and to permit persons to whom the Software is furnished to do so,

subject to the following conditions:


The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.


THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS

FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR

COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER

IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.*/

import java.net.InetAddress;

import java.net.InterfaceAddress;

import java.net.NetworkInterface;/* 来自 N o w J a v a . c o m - 时代Java*/

import java.net.SocketException;

import java.net.UnknownHostException;

import java.util.Enumeration;

import java.util.HashMap;

import java.util.Iterator;


public class Main{

    public static void main(String[] argv) throws Exception{

        System.out.println(getCurrentIPv4Address());

    }

    /** Get the IP version 4 address of the local device

     * @return the IP version 4 IP address of the local device

     * @throws SocketException */

    public static String getCurrentIPv4Address() throws SocketException {

        for (Enumeration<NetworkInterface> networkInterfaceEnumeration = NetworkInterface

                .getNetworkInterfaces(); networkInterfaceEnumeration

                .hasMoreElements();) {
                /** from 
                nowjava.com**/

            NetworkInterface networkInterface = networkInterfaceEnumeration

                    .nextElement();

            for (Enumeration<InetAddress> ipAddressEnumeration = networkInterface

                    .getInetAddresses(); ipAddressEnumeration

                    .hasMoreElem