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 18 package org.apache.commons.vfs2.util; 19 20 import java.io.IOException; 21 import java.net.ServerSocket; 22 23 public class FreeSocketPortUtil { 24 25 /** 26 * Finds a free local socket port. 27 * 28 * @return a free local socket port. 29 * @throws IOException 30 */ 31 public static int findFreeLocalPort() throws IOException { 32 try (final ServerSocket server = new ServerSocket(0)) { 33 return server.getLocalPort(); 34 } 35 } 36 37 public static void main(final String[] args) throws IOException { 38 System.out.println(FreeSocketPortUtil.findFreeLocalPort()); 39 } 40 }