Commons Net example source code file (TelnetTestSimpleServer.java)

This example Commons Net source code file (TelnetTestSimpleServer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Net tags/keywords

exception, exception, inputstream, io, ioexception, ioexception, net, network, outputstream, runnable, serversocket, socket, telnettestsimpleserver, telnettestsimpleserver, thread, thread

The Commons Net TelnetTestSimpleServer.java source code

/*
 * 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
 *
 *      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.
 */
package org.apache.commons.net.telnet;

import java.net.ServerSocket;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

/***
 * Simple TCP server.
 * Waits for connections on a TCP port in a separate thread.
 * <p>
 * @author Bruno D'Avanzo
 ***/
public class TelnetTestSimpleServer implements Runnable
{
    ServerSocket serverSocket = null;
    Socket clientSocket = null;
    Thread listener = null;

    /***
     * test of client-driven subnegotiation.
     * <p>
     * @param port - server port on which to listen.
     ***/
    public TelnetTestSimpleServer(int port) throws IOException
    {
        serverSocket = new ServerSocket(port);

        listener = new Thread (this);

        listener.start();
    }

    /***
     * Run for the thread. Waits for new connections
     ***/
    public void run()
    {
        boolean bError = false;
        while(!bError)
        {
            try
            {
                clientSocket = serverSocket.accept();
                synchronized (clientSocket)
                {
                    try
                    {
                        clientSocket.wait();
                    }
                    catch (Exception e)
                    {
                        System.err.println("Exception in wait, "+ e.getMessage());
                    }
                    try
                    {
                        clientSocket.close();
                    }
                    catch (Exception e)
                    {
                        System.err.println("Exception in close, "+ e.getMessage());
                    }
                }
            }
            catch (IOException e)
            {
                bError = true;
            }
        }

        try
        {
            serverSocket.close();
        }
        catch (Exception e)
        {
            System.err.println("Exception in close, "+ e.getMessage());
        }
    }


    /***
     * Disconnects the client socket
     ***/
    public void disconnect()
    {
        if (clientSocket == null) {
            return;
        }
        synchronized (clientSocket)
        {
            try
            {
                clientSocket.notify();
            }
            catch (Exception e)
            {
                System.err.println("Exception in notify, "+ e.getMessage());
            }
        }
    }

    /***
     * Stop the listener thread
     ***/
    public void stop()
    {
        listener.interrupt();
        try
        {
            serverSocket.close();
        }
        catch (Exception e)
        {
            System.err.println("Exception in close, "+ e.getMessage());
        }
    }

    /***
     * Gets the input stream for the client socket
     ***/
    public InputStream getInputStream() throws IOException
    {
        if(clientSocket != null)
        {
            return(clientSocket.getInputStream());
        }
        else
        {
            return(null);
        }
    }

    /***
     * Gets the output stream for the client socket
     ***/
    public OutputStream getOutputStream() throws IOException
    {
        if(clientSocket != null)
        {
            return(clientSocket.getOutputStream());
        }
        else
        {
            return(null);
        }
    }
}