Server.java MyCampusNotes

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server
{
    public static void main(String[] args)
    {
        try
        {
            /* We create a server which listens to port no. 4040 of the computer. */
            ServerSocket ss = new ServerSocket(4040);

            /* Server stops at this line unless client connects to it. In a single threaded application like this, we
                         * can handle only one client. The server continues further ONLY WHEN the client connects */
            Socket s = ss.accept();

            /* This stream is connected to the console to accept user input */
            BufferedReader readerForConsole = new BufferedReader(
                    new InputStreamReader(System.in));

            /*
             * This stream is connected to the socket, to accept data from
             * server
             */
            BufferedReader readerForSocket = new BufferedReader(
                    new InputStreamReader(s.getInputStream()));

            /*
             * This stream is connected to the socket, to write data to the
             * server
             */
            PrintWriter writerForSocket = new PrintWriter(s.getOutputStream());

            /*
             * now we can use standard readline() to read data from the server
             * and println() to write data to the server
             */

            while (true)
            {
                /* Read data from server */
                String dataFromServer = readerForSocket.readLine();

                /* write that data to console */
                System.out.println("< Response > " + dataFromServer);

                /* read some data from console */
                String dataFromConsole = readerForConsole.readLine();

                /*
                 * write that data to socket so that server can read it. Please
                 * note that using 'flush()' method is important in buffered
                 * streams otherwise data is not sent to the other side unless
                 * buffer is full.
                 */
                writerForSocket.println(dataFromConsole);
                writerForSocket.flush();

                /*
                 * This loops infinitely, please use cross on your command
                 * prompt window to exit.
                 *
                 * Ideally we should close the I/O stearms as well as the socket
                 * after completing our work. But that would be unreachable code
                 * here as we are looping infinitely.
                 *
                 * Ideally we should do the following :
                 *
                 *
                 * readerForConsole.close();
                 *
                 * readerForSocket.close();
                 *
                 * writerForSocket.close();
                 *
                 * s.close();
                 */
            }
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}