Java HTTP Port Find getAnonymousPort()

Description

Get an anonymous port

License

Open Source License

Return

An anonymous port created by instantiating a java.net.ServerSocket with a port of 0

Declaration

public static String getAnonymousPort() throws java.io.IOException 

Method Source Code

//package com.java2s;
/*//from w  w  w  .j  a va2 s  .c  om
 * Copyright 2005 Sun Microsystems, Inc.
 * Copyright 2005 GigaSpaces, Inc.
 *
 * 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 {
    /**
     * Get an anonymous port
     *
     * @return An anonymous port created by instantiating a <code>java.net.ServerSocket</code> with
     * a port of 0
     */
    public static String getAnonymousPort() throws java.io.IOException {
        return String.valueOf(getPort(0));
    }

    /**
     * This method checks whether supplied port is free.
     *
     * If port 0 returns an anonymous port.
     */
    private static int getPort(int port) throws IOException {
        ServerSocket socket = null;

        try {
            socket = new ServerSocket(port);
            return socket.getLocalPort();
        } finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException ex) {
                    /* don't care */ }
            }
        }
    }
}

Related

1. freePort()
2. freePort(int suggestedPort)
3. get(int port, String applicationRoot, String resource, String path)
4. getAllHostNames(String hostName, int portNumber, String bindingUser)
5. getAnonymousPort()
6. getAvailableListenPort()
7. getAvailablePort()
8. getAvailablePort()
9. getAvailablePort()