Java Host Name Get getHostName()

Description

Returns the host name.

License

Apache License

Return

hostname

Declaration

public static String getHostName() 

Method Source Code

//package com.java2s;
/*//www .  j  a  v a  2s.c o m
 * Copyright 2013 Proofpoint Inc.
 *
 *    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.io.*;
import java.net.*;

public class Main {
    /**
     * Returns the host name. First tries to execute "hostname" on the machine. This should work for Linux, Windows,
     * and Mac. If, for some reason hostname fails, then get the name from InetAddress (which might change depending
     * on network setup)
     *
     * @return hostname
     */
    public static String getHostName() {
        try {
            Runtime run = Runtime.getRuntime();
            Process process = run.exec("hostname");
            InputStreamReader isr = new InputStreamReader(process.getInputStream());
            BufferedReader br = new BufferedReader(isr);

            // Need to read all lines from the stream or the process could hang
            StringBuilder buffer = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null)
                buffer.append(line);

            int returnValue = process.waitFor();
            if (returnValue == 0)
                return buffer.toString();
        } catch (Exception e) {
            // ignore
        }

        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            return "";
        }
    }
}

Related

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