Java HTTP Port Find isPortFree(int port)

Description

is Port Free

License

Apache License

Declaration

public static boolean isPortFree(int port) 

Method Source Code

//package com.java2s;
/**/*  ww  w  .j a va 2  s . c o  m*/
 * Copyright 2010 the original author or 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.ConnectException;

import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;

public class Main {
    public static boolean isPortFree(int port) {
        try {
            Socket socket = new Socket("localhost", port);
            socket.close();
            return false;
        } catch (ConnectException e) {
            return true;
        } catch (SocketException e) {
            if (e.getMessage().equals("Connection reset by peer")) {
                return true;
            }
            throw new RuntimeException(e);
        } catch (UnknownHostException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

Related

1. isPortAvailable(String hostName, int port)
2. isPortAvailable(String hostname, int port)
3. isPortAvailable(String hostname, int port)
4. isPortAvailable(String portNumber)
5. isPortBound(int port)
6. isPortFree(int port)
7. isPortFree(int portNumber)
8. isPortFree(String hostName, String port)
9. isPortFreeClient(String hostName, int portNumber)