Modify MessageClient so that it does something meaningful. Design an Application

Question

Modify MessageClient so that it does something meaningful.

Design an Application Protocol

You must have at least 3 client request commands besides QUIT. You may add as many as you need.

Modify MessageClient so that it repeats until the user puts in the menu item to QUIT.

Modify MessageServer so that it continues to read from the inputStream and returns the appropriate responses to the menu in the MessageClient based on your Application Protocol, until it receives the QUIT request from the client.

Upload your modified MessageClient.java, MessageServer.java and your Application Protocol (in a .doc or .docx file).

/***************************************************************************************************************************************************************/

MessageClient.java

/*********************************************************************************************************************************************************************/

MessageServer.java

Explanation / Answer

MessageClient.java

package com.chegg.arrays;

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class MessageClient {
   public static void main(String args[]) {
       Scanner scan = null;
       try {
           scan = new Scanner(System.in);
           int option = 0;
           do {
               Socket client = new Socket("localhost", 8800);
               InputStream instream = client.getInputStream();
               OutputStream outstream = client.getOutputStream();
               PrintWriter out = new PrintWriter(outstream);
               Scanner in = new Scanner(instream);
               System.out
                       .println("1. First 2. Second 3. Third 4. Quit Which option? ");
               option = scan.nextInt();

               out.print("" + option + " ");
               out.flush();
               String response = in.nextLine();
               System.out.println(response);
               in.close();
               client.close();
           } while (option != 4);
           scan.close();
       }

       catch (UnknownHostException e) {
           System.err.println("No such host");
       } catch (IOException e) {
           System.err.println(e.getMessage());
       }
   }
}

MessageServer.java

package com.chegg.arrays;

import java.io.*;
import java.net.*;
import java.util.Date;
import java.util.Scanner;

class MessageServer {
public static void main(String[] args) {
try {
ServerSocket server = new ServerSocket(8800);
System.out.println("Waiting for clients to connect . . .");

while (true) {
Socket client = server.accept();
System.out.println("Client connected.");

Scanner in = new Scanner(client.getInputStream());
PrintWriter out = new PrintWriter(client.getOutputStream());
String whichMessageString = in.nextLine();
int whichMessage = Integer.parseInt(whichMessageString);
System.out.println("whichMessage " + whichMessage);
switch(whichMessage)
{
case 1:out.println("You have chosen the first option");
out.flush();
break;
case 2: out.println("You have chosen the second option");
out.flush();
break;
case 3 : out.println("You have chosen the third option");
out.flush();
break;
case 4 : out.println("");
out.flush();
break;
default : out.println("Invalid choice");
out.flush();
}
out.flush();

out.close();
client.close();

}
}
catch (IOException e) {
System.err.println(e.getMessage());
}
}
}

Client Request Server Response Description 1 You have chosen the first option server sends response to first client request 2 You have chosen the second option server sends response to second client request 3 You have chosen the third option server sends response to third client request 4 None Quit Connection

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