Java HTTP Port Find isPortAvailable(String hostname, int port)

Description

Checks whether the supplied port is available on the specified address.

License

Open Source License

Parameter

Parameter	Description
hostname	the address to check for.
port	the port to check for.

Return

true if the port is available, otherwise false.

Declaration

public static boolean isPortAvailable(String hostname, int port) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2008, 2010 VMware Inc./*from  ww w .  j  a  v  a  2  s .c  om*/
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   VMware Inc. - initial contribution
 *******************************************************************************/

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

public class Main {
    /**
     * Checks whether the supplied port is available on any local address.
     * 
     * @param port the port to check for.
     * @return <code>true</code> if the port is available, otherwise <code>false</code>.
     */
    public static boolean isPortAvailable(int port) {
        ServerSocket socket;
        try {
            socket = new ServerSocket();
        } catch (IOException e) {
            throw new IllegalStateException("Unable to create ServerSocket.", e);
        }

        try {
            InetSocketAddress sa = new InetSocketAddress(port);
            socket.bind(sa);
            return true;
        } catch (IOException ex) {
            return false;
        } finally {
            try {
                socket.close();
            } catch (IOException ex) {
            }
        }
    }

    /**
     * Checks whether the supplied port is available on the specified address.
     * 
     * @param hostname the address to check for.
     * @param port the port to check for.
     * @return <code>true</code> if the port is available, otherwise <code>false</code>.
     */
    public static boolean isPortAvailable(String hostname, int port) {
        ServerSocket socket;
        try {
            socket = new ServerSocket();
        } catch (IOException e) {
            throw new IllegalStateException("Unable to create ServerSocket.", e);
        }

        try {
            InetSocketAddress sa = new InetSocketAddress(hostname, port);
            socket.bind(sa);
            return true;
        } catch (IOException ex) {
            return false;
        } finally {
            try {
                socket.close();
            } catch (IOException ex) {
            }
        }
    }
}

Related

1. isPortAvailable(String host, int port)
2. isPortAvailable(String host, int port)
3. isPortAvailable(String host, int port)
4. isPortAvailable(String host, int port)
5. isPortAvailable(String host, int port)
6. isPortAvailable(String hostname, int port)
7. isPortAvailable(String hostName, int port)
8. isPortAvailable(String portNumber)
9. isPortBound(int port)