1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.vfs2.util;
18
19 import java.io.IOException;
20 import java.net.ServerSocket;
21
22 public class FreeSocketPortUtil {
23
24 /**
25 * Finds a free local socket port.
26 *
27 * @return a free local socket port.
28 * @throws IOException
29 */
30 public static int findFreeLocalPort() throws IOException {
31 try (ServerSocket server = new ServerSocket(0)) {
32 return server.getLocalPort();
33 }
34 }
35
36 public static void main(final String[] args) throws IOException {
37 System.out.println(FreeSocketPortUtil.findFreeLocalPort());
38 }
39
40 }