Java HTTP Port Find getRandomFreePort()

Description

get Random Free Port

License

Apache License

Declaration

public static int getRandomFreePort() 

Method Source Code

//package com.java2s;
/*//  w  w w. j  a v a2  s. c o m
 * Copyright 2014 Fluo authors (see AUTHORS)
 *
 * 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;
import java.util.Random;

public class Main {
    public static int getRandomFreePort() {
        Random r = new Random();
        int count = 0;

        while (count < 13) {
            int port = r.nextInt((1 << 16) - 1024) + 1024;

            try (ServerSocket so = new ServerSocket(port)) {
                so.setReuseAddress(true);
                return port;
            } catch (IOException e) {
                // ignore
            }
        }

        throw new RuntimeException("Unable to find port");
    }
}

Related

1. getPorts(int count)
2. getPorts(int number, int MIN_PORT_NUMBER, int MAX_PORT_NUMBER)
3. getPrometheusMetrics(int metricsPort)
4. getRandomAvailablePort()
5. getRandomFreePort()
6. getRandomOpenPort()
7. getRandomPort()
8. getRandomPort()
9. getRandomPort()