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DemchkoServer.java 3.07 KiB
package MV3500Cohort2018JulySeptember.homework2.Demchko;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *
 * @author ekdem
 */
public class DemchkoServer {

    @SuppressWarnings("ConvertToTryWithResources")

    /**
     * Program invocation, execution starts here
     * @param args command-line arguments
     */
    public static void main(String[] args)
	{
		try {
			// ServerSocket waits for a connection from a client. 
			// Notice that it is outside the loop; ServerSocket
			// needs to be made only once.

			ServerSocket serverSocket = new ServerSocket(2317);

			// Loop, infinitely, waiting for client connections.
			// Stop the program somewhere else.
			while (true)
			{
				Socket clientConnection = serverSocket.accept(); // block until connected
				OutputStream os = clientConnection.getOutputStream();
				PrintStream ps = new PrintStream(os);
                                
                                Scanner keyboard = new Scanner(System.in);
                                System.out.println("Why did the chicken cross the road?");
                                String message = keyboard.nextLine();
				ps.println(message);

				// Print some information locally about the Socket
				// connection. This includes the port and IP numbers
				// on both sides (the socket pair.)
				InetAddress localAddress = clientConnection.getLocalAddress();
				InetAddress remoteAddress = clientConnection.getInetAddress();

				int localPort = clientConnection.getLocalPort();
				int remotePort = clientConnection.getPort();

				// My socket pair connection looks like this, to localhost:
				// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
				// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
				//
				// Why is the first IP/port the same, while the second set has
				// different ports?
				System.out.println("Socket pair: (( " + localAddress.toString().trim() + ", " + localPort + " ), ( "
						+ remoteAddress.toString() + ", " + remotePort + " ))");
                                
                                InputStream is = clientConnection.getInputStream();
				InputStreamReader isr = new InputStreamReader(is);
				BufferedReader br = new BufferedReader(isr);

				String serverMessage = br.readLine();
				System.out.println("This time try " + serverMessage);
                                

				// Notice the use of flush() and close(). Without
				// the close() to Socket object may stay open for 
				// a while after the client has stopped needing this
				// connection. Close() explicitly ends the connection.
				ps.flush();
				clientConnection.close(); // like it or not, you're outta here!
			}
		} 
		catch (IOException e) {
			System.out.println("Houston, we have a problem: " + e);
		}
	}
    
}