Java HTTP Port Find serverListening(String hostName, int port)

Description

Checks if there is a server socket listening in the given host and port.

License

Open Source License

Parameter

Parameter	Description
host	the host where to look for the server socket
port	the expected port the server is listening

Return

true if there is a server socket listening in the given address and port, false otherwise

Declaration

public static boolean serverListening(String hostName, int port) 

Method Source Code

//package com.java2s;
/*//from www.  ja  v a2 s.c  o  m
 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 2.0, as published by the
 * Free Software Foundation.
 *
 * This program is also distributed with certain software (including but not
 * limited to OpenSSL) that is licensed under separate terms, as designated in a
 * particular file or component or in included license documentation. The
 * authors of MySQL hereby grant you an additional permission to link the
 * program and your derivative works with the separately licensed software that
 * they have included with MySQL.
 *
 * Without limiting anything contained in the foregoing, this file, which is
 * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
 * version 1.0, a copy of which can be found at
 * http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * 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, version 2.0,
 * 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.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */

import java.net.InetAddress;

import java.net.Socket;

import java.net.UnknownHostException;

public class Main {
    /**
     * Checks if there is a server socket listening in the given host and port.
     * 
     * @param host
     *            the host where to look for the server socket
     * @param port
     *            the expected port the server is listening
     * @return true if there is a server socket listening in the given address and port, false otherwise
     */
    public static boolean serverListening(String hostName, int port) {
        try {
            return serverListening(InetAddress.getByName(hostName), port);
        } catch (UnknownHostException e) {
            return false;
        }
    }

    /**
     * Checks if there is a server socket listening in the given address and port.
     * 
     * @param addr
     *            the address where to look for the server socket
     * @param port
     *            the expected port the server is listening
     * @return true if there is a server socket listening in the given address and port, false otherwise
     */
    public static boolean serverListening(InetAddress addr, int port) {
        Socket s = null;
        try {
            s = new Socket(addr, port);
            return true;
        } catch (Exception e) {
            return false;
        } finally {
            if (s != null) {
                try {
                    s.close();
                } catch (Exception e) {
                }
            }
        }
    }
}

Related

1. sendCommand(final String command, final int monitorPort)
2. sendCommand(String host, Integer port, String cmd)
3. serverIsUp(int port)
4. ServerListening(String host, int port)
5. serverListening(String host, int port)
6. waitForLiveServer(String webContainerHostname, int webContainerPort, int timeoutMin)
7. waitForPort(String host, int port)
8. waitForResponseCode(int code, String name, String host, int port)
9. waitForRespose(String name, String host, int port)