Java HTTP Port Find availablePort()

Description

Will determine the available port

License

Apache License

Declaration

public final static int availablePort() 

Method Source Code

//package com.java2s;
/*//from  w w  w  .j av  a 2  s  .c o  m
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  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.ServerSocket;

public class Main {
    /**
     * Will determine the available port
     */
    public final static int availablePort() {
        ServerSocket s = null;
        try {
            s = new ServerSocket(0);
            s.setReuseAddress(true);
            return s.getLocalPort();
        } catch (Exception e) {
            throw new IllegalStateException("Failed to discover available port.", e);
        } finally {
            try {
                s.close();
            } catch (IOException e) {
                // ignore
            }
        }
    }
}

Related

1. available(int port)
2. available(int port)
3. available(int port)
4. available_port()
5. availableAndReturn(int MIN_PORT_NUMBER, int MAX_PORT_NUMBER)
6. availablePort(int port)
7. availablePort(int pPort)
8. availablePort(int prefered)
9. canConnect(String host, int port)