Java InetAddress Check isPortInUse(InetAddress address, int port, int count)

Description

Checks to see if the given local port number is being used.

License

Open Source License

Parameter

Parameter	Description
address	a local InetAddress
port	the port number to check
count	the number of times to retry

Return

boolean true if the port is in use, and false otherwise

Declaration

public static boolean isPortInUse(InetAddress address, int port, int count) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2003, 2011 IBM Corporation and others.
 * 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:/*from   w w  w  . j a  va 2 s .  c om*/
 *     IBM Corporation - Initial API and implementation
 *******************************************************************************/

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

import java.net.ServerSocket;
import java.net.SocketException;

public class Main {
    /**
     * Checks to see if the given local port number is being used. 
     * Returns <code>true</code> if the given port is in use, and <code>false</code>
     * otherwise. Retries every 500ms for "count" tries.
     *
     * @param port the port number to check
     * @param count the number of times to retry
     * @return boolean <code>true</code> if the port is in use, and
     *    <code>false</code> otherwise
     */
    public static boolean isPortInUse(int port, int count) {
        return isPortInUse(null, port, count);
    }

    /**
     * Checks to see if the given local port number is being used. 
     * Returns <code>true</code> if the given port is in use, and <code>false</code>
     * otherwise. Retries every 500ms for "count" tries.
     *
     * @param address a local InetAddress
     * @param port the port number to check
     * @param count the number of times to retry
     * @return boolean <code>true</code> if the port is in use, and
     *    <code>false</code> otherwise
     * @since 1.1
     */
    public static boolean isPortInUse(InetAddress address, int port, int count) {
        boolean inUse = isPortInUse(address, port);
        while (inUse && count > 0) {
            try {
                Thread.sleep(500);
            } catch (Exception e) {
                // ignore
            }
            inUse = isPortInUse(address, port);
            count--;
        }

        return inUse;
    }

    /**
     * Checks to see if the given local port number is being used.
     * Returns <code>true</code> if the given port is in use, and <code>false</code>
     * otherwise.
     *
     * @param port the port number to check
     * @return boolean <code>true</code> if the port is in use, and
     *    <code>false</code> otherwise
     */
    public static boolean isPortInUse(int port) {
        return isPortInUse(null, port);
    }

    /**
     * Checks to see if the given local port number is being used.
     * Returns <code>true</code> if the given port is in use, and <code>false</code>
     * otherwise.
     * 
     * @param address a local InetAddress
     * @param port the port number to check
     * @return boolean <code>true</code> if the port is in use, and
     *    <code>false</code> otherwise
     * @since 1.1
     */
    public static boolean isPortInUse(InetAddress address, int port) {
        ServerSocket s = null;
        try {
            s = new ServerSocket(port, 0, address);
        } catch (SocketException e) {
            return true;
        } catch (IOException e) {
            return true;
        } catch (Exception e) {
            return true;
        } finally {
            if (s != null) {
                try {
                    s.close();
                } catch (Exception e) {
                    // ignore
                }
            }
        }

        return false;
    }
}

Related

1. isLoopbackAddress(InetAddress address)
2. isLoopbackIp(InetAddress addr)
3. isMulticastAddress(InetAddress ipAddr)
4. isOnNetwork(InetAddress host, InetAddress network, byte[] mask)
5. isPortFree(int port, InetAddress addr)
6. isPortOpen(InetAddress address, int port)
7. isPrivate(InetAddress addr)
8. isPrivate(InetAddress adr)
9. isPrivateIp(final InetAddress address)