Java HTTP Port Find getNonPrivilegedPort()

Description

assigns a port from the range of test ports

License

Apache License

Return

port number

Declaration

public static int getNonPrivilegedPort() 

Method Source Code

//package com.java2s;
/****************************************************************
 * 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 {
    private static final int PORT_RANGE_START = 8000;
    private static final int PORT_RANGE_END = 11000;
    private static int PORT_LAST_USED = PORT_RANGE_START;

    /**//w w  w . java  2  s  .co  m
     * assigns a port from the range of test ports
     * @return port number
     */
    public static int getNonPrivilegedPort() {
        return getNextNonPrivilegedPort(); // uses sequential assignment of ports
    }

    /**
     * assigns ports sequentially from the range of test ports
     * @return port number
     */
    protected synchronized static int getNextNonPrivilegedPort() {
        // Hack to increase probability that the port is bindable
        while (true) {
            try {
                PORT_LAST_USED++;
                if (PORT_LAST_USED > PORT_RANGE_END)
                    PORT_LAST_USED = PORT_RANGE_START;
                ServerSocket ss;
                ss = new ServerSocket(PORT_LAST_USED);
                ss.setReuseAddress(true);
                ss.close();
                break;
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return PORT_LAST_USED;
    }
}

Related

1. getNextAvailablePort()
2. getNextAvailablePort(final int min, final int max, final Collection excepted)
3. getNextAvailablePort(int port)
4. getNextNonPrivilegedPort()
5. getNodeName(final String managementServerHostName, final int managementPort)
6. getOpenPort()
7. getPort(final int suggestedPort)
8. getPort(int port)
9. getPort(Proxy proxy)