Java HTTP Port Find getNextAvailablePort(final int min, final int max, final Collection excepted)

Description

get Next Available Port

License

Apache License

Declaration

public static int getNextAvailablePort(final int min, final int max, final Collection<Integer> excepted) 

Method Source Code

//package com.java2s;
/*/*from   www. j a  v  a  2s . c o m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;

import java.net.ServerSocket;

import java.util.Collection;

public class Main {
    public static int getNextAvailablePort() {
        return getNextAvailablePort(new int[] { 0 });
    }

    public static int getNextAvailablePort(final int[] portList) {
        int port;
        ServerSocket s = null;
        try {
            s = create(portList);
            port = s.getLocalPort();
        } catch (final IOException ioe) {
            port = -1;
        } finally {
            if (s != null) {
                try {
                    s.close();
                } catch (final Throwable e) {
                    //Ignore
                }
            }
        }
        return port;
    }

    public static int getNextAvailablePort(final int min, final int max, final Collection<Integer> excepted) {
        int port = -1;
        ServerSocket s = null;
        for (int i = min; i <= max; i++) {
            try {
                s = create(new int[] { i });
                port = s.getLocalPort();

                if (excepted == null || !excepted.contains(port)) {
                    break;
                }
            } catch (final IOException ioe) {
                port = -1;
            } finally {
                if (s != null) {
                    try {
                        s.close();
                    } catch (final Throwable e) {
                        //Ignore
                    }
                }
            }
        }
        return port;
    }

    private static ServerSocket create(final int[] ports) throws IOException {
        for (final int port : ports) {
            try {
                return new ServerSocket(port);
            } catch (final IOException ex) {
                // try next port
            }
        }

        // if the program gets here, no port in the range was found
        throw new IOException("No free port found");
    }
}

Related

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