Java HTTP Port Find getFreePort()

Description

Retrieve a free port.

License

Apache License

Exception

Parameter	Description
IOException	if no free port could be retrieved

Return

some free port

Declaration

public static int getFreePort() throws IOException 

Method Source Code

//package com.java2s;
/*/*from w  w w.  j a  v a2s  .com*/
 * Copyright 2014 Mark Michaelis
 *
 * 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.ServerSocket;

public class Main {
    /**
     * Retrieve a free port.
     *
     * @return some free port
     * @throws IOException if no free port could be retrieved
     */
    public static int getFreePort() throws IOException {
        final int port;
        try (ServerSocket s = new ServerSocket(0)) {
            port = s.getLocalPort();
        }
        return port;
    }
}

Related

1. getAvialablePort(final int basePort)
2. getCorrectHostnamePort(String hostPort)
3. getEffectivePort(String scheme, int specifiedPort)
4. getEphemeralPort()
5. getFreeLocalPort()
6. getFreePort()
7. getFreePort()
8. getFreePort()
9. getFreePort()