IPAddressUtil.java

/**
 * Project: doris.common-0.1.0-SNAPSHOT
 * 
 * File Created at 2011-7-8
 * $Id$
 * 
 * Copyright 1999-2100 Alibaba.com Corporation Limited.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * Alibaba Company. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Alibaba.com.
 */
package com.alibaba.doris.common.util;

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

/**
 * TODO Comment of IPAddressUtil
 * 
 * @author mian.hem
 */
public final class IPAddressUtil {

    /**
     * 如果没有配置外网ip，则返回本地ip
     */
    public static String getIPAddress() {
        String localip = null;// 本地IP，如果没有配置外网IP则返回它
        String netip = null;// 外网IP
        try {
            Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            boolean found = false;// 是否找到外网IP
            while (netInterfaces.hasMoreElements() && !found) {
                NetworkInterface ni = netInterfaces.nextElement();
                Enumeration<InetAddress> address = ni.getInetAddresses();
                while (address.hasMoreElements()) {
                    ip = address.nextElement();
                    if (!ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
                            && ip.getHostAddress().indexOf(":") == -1) {// 外网IP
                        netip = ip.getHostAddress();
                        found = true;
                        break;
                    } else if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
                            && ip.getHostAddress().indexOf(":") == -1) {// 内网IP
                        localip = ip.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            throw new IllegalStateException(e);
        }
        if (netip != null && !"".equals(netip)) {
            return netip;
        } else {
            return localip;
        }
    }
}