Java Host Name Get getHostName()

Description

get Host Name

License

Open Source License

Declaration

public static String getHostName() 

Method Source Code

//package com.java2s;
/**//ww  w. ja v  a2 s  .co  m
 * $Revision: 1.0
 * $Date: 2013-5-21
 *
 * Copyright (C) 2013-2020 MNT. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

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

public class Main {
    public static String getHostName() {
        String hostName = null;

        try {
            InetAddress a = InetAddress.getLocalHost();
            hostName = a.getHostName();
        } catch (UnknownHostException e) {
            // ignore
        }

        if (hostName == null) {
            boolean bFindIP = false;
            Enumeration<NetworkInterface> netInterfaces = null;
            try {
                netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface.getNetworkInterfaces();
            } catch (SocketException e) {
                // ignore
            }

            if (netInterfaces != null) {
                while (netInterfaces.hasMoreElements()) {
                    if (bFindIP) {
                        break;
                    }

                    NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
                    Enumeration<InetAddress> ips = ni.getInetAddresses();
                    while (ips.hasMoreElements()) {
                        InetAddress ip = (InetAddress) ips.nextElement();
                        if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
                                && ip.getHostAddress().indexOf(":") == -1) {
                            bFindIP = true;

                            hostName = ip.getHostName();
                            break;
                        }
                    }
                }
            }
        }

        if (hostName == null) {
            hostName = "unknown";
        }

        return hostName;
    }
}

Related

1. getHost(String s)
2. getHostCore(final String quadGraph)
3. getHostGateway()
4. getHostInformation()
5. getHostMac(String host)
6. getHostname()
7. getHostName()
8. getHostName()
9. getHostname()