Java HTTP Port Find isPortFree(String hostName, String port)

Description

Checks whether the given port is free on the specified host NOTE: works properly only on local host

License

Open Source License

Parameter

Parameter	Description
hostName	The host where the port should be checked
port	The port to be checked

Return

True only if the host is reachable and the port is free to bind.

Declaration

public static boolean isPortFree(String hostName, String port) 

Method Source Code

//package com.java2s;
/*************************************************************************
 *
 *  The Contents of this file are made available subject to the terms of
 *  the Sun Industry Standards Source License Version 1.2
 *
 *  Sun Microsystems Inc., March, 2001//from w w w  . ja  v  a  2  s. com
 *
 *
 *  Sun Industry Standards Source License Version 1.2
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.2 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://gridengine.sunsource.net/Gridengine_SISSL_license.html
 *
 *  Software provided under this License is provided on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
 *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
 *  See the License for the specific provisions governing your rights and
 *  obligations concerning the Software.
 *
 *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
 *
 *  Copyright: 2001 by Sun Microsystems, Inc.
 *
 *  All Rights Reserved.
 *
 ************************************************************************/

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;

public class Main {
    /**
     * Checks whether the given port is free on the specified host
     *
     * NOTE: works properly only on local host
     *
     * @param hostName The host where the port should be checked
     * @param port The port to be checked
     * @return True only if the host is reachable and the port is free to bind.
     */
    public static boolean isPortFree(String hostName, String port) {
        try {
            return isPortFree(hostName, Integer.parseInt(port));
        } catch (Exception e) {
            return false;
        }
    }

    /**
     * Checks whether the given port is free on the specified host
     *
     * NOTE: works properly only on local host
     *
     * @param hostName The host where the port should be checked
     * @param port The port to be checked
     * @return True only if the host is reachable and the port is free to bind.
     */
    public static boolean isPortFree(String hostName, int port) {
        try {
            ServerSocket serverSocket = new ServerSocket(port, 0, InetAddress.getByName(hostName));
            serverSocket.close();
            return true;
        } catch (IOException e) {
            //e.printStackTrace();
            return false;
        }
    }
}

Related

1. isPortAvailable(String portNumber)
2. isPortBound(int port)
3. isPortFree(int port)
4. isPortFree(int port)
5. isPortFree(int portNumber)
6. isPortFreeClient(String hostName, int portNumber)
7. isPortInUse(final String host, final Integer port)
8. isPortInUse(int port)
9. isPortOnUse(int port)