Java DNS getDnsDomainName()

Description

Get the DNS domain name (eg: example.org).

License

Open Source License

Exception

Parameter	Description

Return

DNS domain

Declaration

public static String getDnsDomainName() throws UnknownHostException 

Method Source Code

//package com.java2s;
/*// w  w w  .j  a  v a2  s .co  m
 * Sonar LDAP Plugin
 * Copyright (C) 2009 SonarSource
 * dev@sonar.codehaus.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */

import java.net.InetAddress;
import java.net.UnknownHostException;

public class Main {
    /**
     * Get the DNS domain name (eg: example.org).
     *
     * @return DNS domain
     * @throws java.net.UnknownHostException if unable to determine DNS domain
     */
    public static String getDnsDomainName() throws UnknownHostException {
        return getDnsDomainName(InetAddress.getLocalHost().getCanonicalHostName());
    }

    /**
     * Extracts DNS domain name from Fully Qualified Domain Name.
     *
     * @param fqdn Fully Qualified Domain Name
     * @return DNS domain name or null, if can't be extracted
     */
    public static String getDnsDomainName(String fqdn) {
        if (fqdn.indexOf('.') == -1) {
            return null;
        }
        return fqdn.substring(fqdn.indexOf('.') + 1);
    }
}

Related

1. getDNSName(String s)
2. resolveDNS(String dns)