Java Host Name Get getHostName()

Description

API to find the hostname.

License

Apache License

Declaration

public static String getHostName() 

Method Source Code

//package com.java2s;
/**/*from   ww w. j  ava 2 s  .c  o  m*/
* Copyright Microsoft Corp.
*
* 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;

public class Main {
    /**
     * API to find the hostname. This API first checks OS type. If Windows then
     * tries to get hostname from computername environment variable else uses
     * environment variable hostname.
     * 
     * In case if hostname is not found from environment variable then uses java
     * networking apis
     * 
     */
    public static String getHostName() {
        String hostOS = System.getProperty("os.name");
        String hostName = null;

        // Check host Operating System and get value of hostname.
        if (hostOS != null && hostOS.indexOf("Win") >= 0) {
            hostName = System.getenv("COMPUTERNAME");
        } else { // non-windows platforms
            hostName = System.getenv("HOSTNAME");
        }

        // If hostname is still null , use java network apis
        try {
            if (hostName == null || hostName.isEmpty()) {
                hostName = InetAddress.getLocalHost().getHostName();
            }
        } catch (Exception ex) { // catches UnknownHostException
            // just ignore this exception
        }

        if (hostName == null || hostName.isEmpty()) { // most probabily this
            // case won't happen
            hostName = "localhost";
        }

        return hostName;
    }
}

Related

1. getHostname()
2. getHostName()
3. getHostName()
4. getHostname()
5. getHostName()
6. getHostname()
7. getHostName()
8. getHostname()
9. getHostName(Proxy proxy)