Java HTTP Port Find isPortOpen(int port, String host)

Description

Check whether the provided port is open

License

Open Source License

Parameter

Parameter	Description
port	The port that needs to be checked
host	The host address

Return

true if the port is open & false otherwise

Declaration

public static boolean isPortOpen(int port, String host) 

Method Source Code

//package com.java2s;
/*/*from w  w  w  .j a va  2  s  . c o m*/
*  Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. 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.Socket;
import java.util.concurrent.TimeUnit;

public class Main {
    /**
     * Check whether the provided port is open
     *
     * @param port The port that needs to be checked
     * @param host The host address
     * @return true if the <code>port</code> is open & false otherwise
     */
    public static boolean isPortOpen(int port, String host) {
        Socket socket = null;
        boolean isPortOpen;
        try {
            socket = new Socket(host, port);
            isPortOpen = socket.isConnected();
        } catch (IOException e) {
            isPortOpen = false;
        } finally {
            try {
                if ((socket != null) && (socket.isConnected())) {
                    socket.close();
                }
            } catch (IOException e) {
                //ignore
            }
        }
        return isPortOpen;
    }

    /**
     * Check whether the provided port is open within the given timeout
     *
     * @param port The port that needs to be checked
     * @param host The host address
     * @param timeOut maximum timeout wait for port to open
     * @return true if the <code>port</code> is open within given timeout & false otherwise
     */
    public static boolean isPortOpen(int port, String host, final int timeOut) {
        boolean isPortOpen = false;
        long startTime = System.currentTimeMillis();
        while (!isPortOpen && (System.currentTimeMillis() - startTime) < timeOut) {
            isPortOpen = isPortOpen(port, host);
            if (isPortOpen) {
                break;
            }
            try {
                TimeUnit.MILLISECONDS.sleep(300);
            } catch (InterruptedException e) {
                //ignore
            }
        }
        return isPortOpen;
    }
}

Related

1. isPortFreeClient(String hostName, int portNumber)
2. isPortInUse(final String host, final Integer port)
3. isPortInUse(int port)
4. isPortOnUse(int port)
5. isPortOpen(int port)
6. isPortOpen(String host, int port)
7. isPortUsed(final int portNumber, final String host)
8. isPortUsed(int port)
9. isPortUsing(String host, int port)