Java HTTP Port Find available(int port)

Description

Checks if a port is available by attempting to create a socket

License

Apache License

Parameter

Parameter	Description
port	the port on which to check

Return

true, if socket creation failed i.e. port is available false, if socket creation succeeded i.e. port is in use

Declaration

public static boolean available(int port) 

Method Source Code

//package com.java2s;
/*/*from w  w  w .ja  v  a2s  .co m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. 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.Socket;

public class Main {
    /**
     * Checks if a port is available by attempting to create a socket 
     * 
     * @param port the port on which to check
     * @return true, if socket creation failed i.e. port is available
     *          false, if socket creation succeeded i.e. port is in use
     */
    public static boolean available(int port) {
        try {
            Socket ignored = new Socket("localhost", port);
            ignored.close();
            return false;
        } catch (IOException ignored) {
            return true;
        }
    }
}

Related

1. available(final int port)
2. available(int port)
3. available(int port)
4. available(int port)
5. available_port()
6. availableAndReturn(int MIN_PORT_NUMBER, int MAX_PORT_NUMBER)