Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 package de.elxala.langutil
 (c) Copyright 2013 Wakeupthecat UG, Alejandro Xalabarder Aulet
    
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3 of the License, or (at your option) any later
 version.
    
 This program is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 PARTICULAR PURPOSE. See the GNU General Public License for more details.
    
 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 Place - Suite 330, Boston, MA 02111-1307, USA.
 */

import java.net.*;

public class Main {
    public static String HOST_NAME = null;
    public static String HOST_IPADDRESS = null;

    public static String getThisHostName() {
        if (HOST_NAME == null)
            obtainHostInfo();
        return HOST_NAME;
    }

    protected static void obtainHostInfo() {
        HOST_IPADDRESS = "127.0.0.1";
        HOST_NAME = "";

        try {
            InetAddress primera = InetAddress.getLocalHost();
            String hostname = InetAddress.getLocalHost().getHostName();

            if (!primera.isLoopbackAddress() && !primera.getHostName().equalsIgnoreCase("localhost")
                    && primera.getHostAddress().indexOf(':') == -1) {
                // Get it without delay!!

                //System.out.println ("we have it!");
                HOST_IPADDRESS = primera.getHostAddress();
                HOST_NAME = hostname;
                //System.out.println (hostname + " IP " + HOST_IPADDRESS);
                return;
            }

            // Get it by slow way ...
            InetAddress[] familia = InetAddress.getAllByName(hostname);

            int netto = 1;
            for (int aa = 0; aa < familia.length; aa++) {
                // System.out.println ("Networko " + netto++);
                InetAddress laAdd = familia[aa];
                String ipstring = laAdd.getHostAddress();
                hostname = laAdd.getHostName(); // don't know if it can change, probably not

                // System.out.println ("checking : " + hostname + " IP " + ipstring);
                if (laAdd.isLoopbackAddress())
                    continue;
                if (hostname.equalsIgnoreCase("localhost"))
                    continue;
                if (ipstring.indexOf(':') >= 0)
                    continue;

                // System.out.println ("this pass!");
                HOST_IPADDRESS = ipstring;
                HOST_NAME = hostname;
                break;
            }
        } catch (Exception e) {
        }
    }
}