Java HTTP Port Find isPortAvailable(int port)

Description

Checks to see if a specific port is available.

License

Open Source License

Parameter

Parameter	Description
port	the port number to check for availability

Exception

Parameter	Description
IllegalArgumentException	is thrown if the port number is out of range

Return

true if the port is available, or false if not

Declaration

private static boolean isPortAvailable(int port) 

Method Source Code

//package com.java2s;
/*//from w  ww . ja v a 2 s  .c  o m
 * Copyright (c) 2017, WSO2 Inc. (http://wso2.com) All Rights Reserved.
 *
 * 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.DatagramSocket;
import java.net.ServerSocket;

public class Main {
    /**
     * Checks to see if a specific port is available.
     *
     * @param port the port number to check for availability
     * @return <tt>true</tt> if the port is available, or <tt>false</tt> if not
     * @throws IllegalArgumentException is thrown if the port number is out of range
     */
    private static boolean isPortAvailable(int port) {
        ServerSocket ss = null;
        DatagramSocket ds = null;
        try {
            ss = new ServerSocket(port);
            ss.setReuseAddress(true);
            ds = new DatagramSocket(port);
            ds.setReuseAddress(true);
            return true;
        } catch (IOException e) {
            // Do nothing
        } finally {
            if (ds != null) {
                ds.close();
            }

            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                    /* should not be thrown */
                }
            }
        }

        return false;
    }
}

Related

1. isPortAvailable(int port)
2. isPortAvailable(int port)
3. isPortAvailable(int port)
4. isPortAvailable(int port)
5. isPortAvailable(int port)
6. isPortAvailable(String host, int port)
7. isPortAvailable(String host, int port)
8. isPortAvailable(String host, int port)
9. isPortAvailable(String host, int port)