package com.ynxbd.push.helper;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

/**
 * 获取本机ip地址
 *
 * @author 李进才
 */
public class IPHelper {
    private IPHelper() {
    }



    public synchronized static String getIp() throws NullPointerException {
        Enumeration<NetworkInterface> allNetInterfaces; // networkInterfaces
        InetAddress ip;

        try {
            allNetInterfaces = NetworkInterface.getNetworkInterfaces();
            while (allNetInterfaces.hasMoreElements()) {
                NetworkInterface netInterface = allNetInterfaces.nextElement();
                Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    ip = addresses.nextElement();
                    if (ip instanceof Inet4Address) {
                        if (ip.getHostAddress().equals("127.0.0.1")) {
                            continue;
                        }
                        return ip.getHostAddress();
                    }
                }
            }
        } catch (java.net.SocketException e) {
            e.printStackTrace();
        }
        return null;
    }
}