RomeroClientHW2.java

package MV3500Cohort2024JulySeptember.homework2.Romero;

import java.io.*;
import java.net.*;
import java.time.LocalDate;
import java.time.DayOfWeek;
//import java.time.LocalTime; // conversion?

/**
 * This client program establishes a socket connection to the {@link RomeroServerHW2},
 * then checks how long it takes to read the single line it expects as a server response.
 * 
 * @author Don McGregor
 * @author Don Brutzman
 * @author MV3500 class
 */
public class RomeroClientHW2
{
    /** 
     * Default constructor 
     */
    public RomeroClientHW2() {  }

    /**
     * Program invocation, execution starts here
     * @param args command-line arguments
     */
    public static void main(String[] args) {
        
        /**
         * Using DataInputStream and DataOutputStream to convert bytes from an 
         * input stream and converting then into Java's primitive data and vice versa
         * respectively         * 
         */
        DataInputStream in;
        DataOutputStream out;
        
        /**
         * Getting the current date from the client, and getting the
         * specific day of the week.
         */
        LocalDate currentDate = LocalDate.now();
        DayOfWeek day = currentDate.getDayOfWeek();
        
        //Cheching the day of the week obtined
        System.out.println("Current date: " + currentDate);
        System.out.println("Today is: " + day + "\n");
        
        System.out.println(RomeroClientHW2.class.getName() + " creating new socket ...");
        
        try {   
            Socket clientConnectionSocket = new Socket("localhost", 2317);
            
            /**
             * Creating a DataInputStream and DataOutputStream objects that reads data 
             * from the input stream of the socket connection and writes data through
             * a socket connection, accordingly 
             */            
            in = new DataInputStream(clientConnectionSocket.getInputStream());
            out = new DataOutputStream(clientConnectionSocket.getOutputStream());
            
            //Specifying the daY of the week, in string format
            out.writeUTF(day.name());
            
            /**
             * Reading and printing strings from the server: 
             * message1 reads the number of client
             * message2 reads the MOTD
             */
            String message1 = in.readUTF();
            String message2 = in.readUTF();
            System.out.println(message1);
            System.out.println(message2);

            clientConnectionSocket.close();

        } catch (IOException e) {
            System.out.println("Problem with " + RomeroClientHW2.class.getName() + " networking:networking:"); // describe what is happening
            System.out.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.out.println("*** Be sure to stop any other running instances of programs using this port!");
            }
        }
    }
}