Java HTTP Port Find getFreePort()

Description

get Free Port

License

Apache License

Declaration

public static int getFreePort() throws IOException 

Method Source Code

//package com.java2s;
/**/*from  w  w w.  j a  va2  s .  c o m*/
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 {
    public static int getFreePort() throws IOException {
        int port = 9999;
        try {
            ServerSocket socket = new ServerSocket(port);
            socket.close();
        } catch (IOException e) {
            if (port > 1024) {
                port--;
            } else {
                throw e;
            }
        }
        return port;
    }
}

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