Java HTTP Port Find getUnusedPort(final int start)

Description

get Unused Port

License

Apache License

Declaration

public static int getUnusedPort(final int start) 

Method Source Code

//package com.java2s;
/*// www .j av  a2 s  . c  om
 * 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;

public class Main {
    private static int DEFAULT_PORT_RANGE_END = 49152;

    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. getResponse(String name, String host, int port)
2. getServerPort()
3. getSupportedConnectionTypes(Map map)
4. getSupportedEntityTypes()
5. getUnusedPort()
6. getUnusedPort(int startPort)
7. getUnusedPorts(final int count, final int start)
8. getValidZooKeeperPort()
9. getWsdlLocation(String portPrefix)