FrankTCPExample3Client.java

package MV3500Cohort2021JulySeptember.homework1;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Socket;

/*
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/**
 *
 * @author justi
 */
public class FrankTCPExample3Client {

    /**
     */
    public final static String LOCALHOST = "0:0:0:0:0:0:0:1";

    /**
     * Program invocation, execution starts here
     * @param args command-line arguments
     */
    public static void main(String[] args)
    {
        // Local variables/fields
        Socket socket = null;
        InputStream is;
        Reader isr;
        BufferedReader br;
        String serverMessage;
        int clientLoopCount = 0;

        try {
            while (true) {
                clientLoopCount++; // increment at beginning of loop for reliability
                System.out.println(FrankTCPExample3Client.class.getName() + " creating socket...");

                // We request an IP to connect to ("localhost") and
                // port number at that IP (2317). This establishes
                // a connection to that IP in the form of a Socket
                // object; the server uses a ServerSocket to wait for
                // connections.
                socket = new Socket(LOCALHOST, 2318); // locohost?

                // Now hook everything up (i.e. set up the streams), Java style:
                is = socket.getInputStream();
                isr = new InputStreamReader(is);
                br = new BufferedReader(isr);

                // Read a single line written by the server. We'd
                // do things a bit differently if there were many lines to be read
                // from the server instead of one only.
                serverMessage = br.readLine();
                System.out.println("==================================================");

                System.out.print("Client loop " + clientLoopCount + ": ");
                System.out.println("now we're talking!");
                System.out.println("The message the server sent was: '" + serverMessage + "'");
                // socket gets closed, either automatically/silently by this code (or possibly by the server)
                if (serverMessage.equals("this is good bye message from the server")) { //if client recieved termanation message stop client
                    break;
                }
                Thread.sleep(1000); // turned it down to 1 second

            } // end while(true) // infinite loops are dangerous, be sure to kill this process!
        } 
        catch (IOException | InterruptedException e) 
        {
            System.err.println("Problem with " + FrankTCPExample3Client.class.getName() + " networking:"); // describe what is happening
            System.err.println("Error: " + e);

            // Provide more helpful information to user if exception occurs due to running twice at one time
            if (e instanceof java.net.BindException) {
                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
            }
        } finally // occurs after any other activity when shutting down
        {
            try {
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
            }

            // program exit: tell somebody about that happening.  Likely cause: server drops connection.
            System.out.println();
            System.out.println("FrankTCPExample3Client.class.getName() + exit");
        }
    }
}