Java HTTP Port Find getNextAvailablePort()

Description

get Next Available Port

License

Open Source License

Declaration

static int getNextAvailablePort() 

Method Source Code

//package com.java2s;
/*/*  w w w.j  a  v  a  2  s  .  c  om*/
 * SonarQube Runner - Implementation
 * Copyright (C) 2011 SonarSource
 * dev@sonar.codehaus.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */

import java.io.IOException;
import java.net.ServerSocket;
import java.util.Arrays;
import java.util.List;

public class Main {
    private static final List<Integer> BLOCKED_PORTS = Arrays.asList(2049, 4045, 6000);

    static int getNextAvailablePort() {
        for (int index = 0; index < 5; index++) {
            try {
                ServerSocket socket = new ServerSocket(0);
                int unusedPort = socket.getLocalPort();
                socket.close();
                if (isValidPort(unusedPort)) {
                    return unusedPort;
                }

            } catch (IOException e) {
                throw new IllegalStateException("Can not find an open network port", e);
            }
        }
        throw new IllegalStateException("Can not find an open network port");
    }

    static boolean isValidPort(int port) {
        return port > 1023 && !BLOCKED_PORTS.contains(port);
    }
}

Related

1. getFreePortNoSych()
2. getFreePortNumber(int defaultPortNumber)
3. getFreeServerPort(int port)
4. getImportedXmlSchemaPath(String namespace, String portType, String operation)
5. getNextAvailable(int port)
6. getNextAvailablePort(final int min, final int max, final Collection excepted)
7. getNextAvailablePort(int port)
8. getNodeName(final String managementServerHostName, final int managementPort)
9. getNonPrivilegedPort()