Java HTTP Port Find getUnusedPorts(final int count, final int start)

Description

get Unused Ports

License

Apache License

Declaration

public static int[] getUnusedPorts(final int count, final int start) 

Method Source Code

//package com.java2s;
/*//from  w  w w .ja  v  a2  s.  co  m
 * Copyright 2013 Brian Thomas Matthews
 *
 * Licensed 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.InetSocketAddress;
import java.net.Socket;

import java.util.Arrays;

public class Main {
    private static int DEFAULT_PORT_RANGE_END = 49152;

    public static int[] getUnusedPorts(final int count, final int start) {
        return getUnusedPorts(count, start, DEFAULT_PORT_RANGE_END);
    }

    public static int[] getUnusedPorts(final int count, final int start, final int end) {
        final int[] ports = new int[count];
        int port = start;
        int index = 0;
        while (index < count && port < end) {
            port = getUnusedPort(port, end);
            if (port != -1) {
                ports[index++] = port++;
            } else {
                return Arrays.copyOf(ports, index);
            }
        }
        return ports;
    }

    public static int getUnusedPort(final int start) {
        return getUnusedPort(start, DEFAULT_PORT_RANGE_END);
    }

    public static int getUnusedPort(final int start, final int end) {
        int port = start;
        while (port < end) {
            final Socket socket = new Socket();
            try {
                socket.connect(new InetSocketAddress("localhost", port), 0);
                socket.setSoLinger(false, 0);
            } catch (final IOException e) {
                return port;
            } finally {
                try {
                    socket.close();
                } catch (final IOException e) {
                }
            }
            port++;
        }
        return -1;
    }
}

Related

1. getSupportedConnectionTypes(Map map)
2. getSupportedEntityTypes()
3. getUnusedPort()
4. getUnusedPort(final int start)
5. getUnusedPort(int startPort)
6. getValidZooKeeperPort()
7. getWsdlLocation(String portPrefix)
8. getXmlReport(String fileName)
9. hasPermissionToBindPort(int port)