For this activity, you will submit two .java files. You will need to run two cla
ID: 3829476 • Letter: F
Question
For this activity, you will submit two .java files. You will need to run two classes simultaneously for this activity. Create a Server and a Client. The Server will accept two Clients when it starts. Then, we’re going to assign an ID to both Clients. Once we have this setup, the Server is going to play a guessing game with the Clients. The Server will randomly pick a number between 1 and 10, and then it will get a guess from each Client. Each Client will accept a numeric entry between 1 and 10 from the user and send their entry to the Server. Don’t forget to use Data Validation and ask for a new entry without terminating the program if invalid data is entered. When the Server has received both entries, it will determine a winner and send a confirmation to both Clients. Everything will then finish and disconnect. Once both IDs have been sent, get an integer from each Client and have the Server receive them one at a time. Then, compare both numbers to the chosen number and decide which player won or if it is a tie (in the case that both players’ choices are the same distance from the server’s chosen number – i.e. if the Server chose 5 and the users chose 3 and 7). Create a String that describes the outcome of the game like shown below and send that to both Clients. This will be enough to finish execution. “Player 1 chose 2. Player 2 chose 7. The Server chose 3. Player 1 wins!” To summarize, your program should do the following: -Create a Server class and a Client class. Have two Clients connect to the Server. -Have the Server send an ID to both Clients. -Have the Server choose a random number from 1 to 10 for a guessing game. -Allow both Clients to get user-input in the form of a number. -Perform entry validation to ensure that each entry is an integer between 1 and 10, prompting for a re-entry without terminating the program if the input is invalid. -Send both user entries back to the Server. -Determine which user chose a number closest to the Server’s target number. -Send a String with an outcome message to both Clients. -Disconnect and close everything.
Explanation / Answer
package mar8;
import java.io.*;
import java.net.*;
public class SimpleTCPServer {
public static void main(String[] args) {
try {
// Create server socket listening on port 8888
ServerSocket server = new ServerSocket(8888);
// to keep number of connections
int i=0;
// we will keep main thread to be actively polling for new connections
// and in parallel, the new thread will start the work and do the
// communication
while (true) {
System.out.println("Main Thread: Waiting for client to connect...");
Socket socket = server.accept();
System.out.println( ++i + " Client connected");
Thread t = new ListenToClientThread(socket, i);
t.start();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
// When you call start() on a Thread it calls run()
class ListenToClientThread extends Thread {
private Socket socket;
private int clientNo;
ListenToClientThread(Socket socket, int clientNo) {
this.socket = socket;
this.clientNo = clientNo;
}
@Override
public void run() {
try {
// Create read/write from socket
PrintWriter out = new PrintWriter(socket.getOutputStream(),
true);
BufferedReader in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
// client address
InetAddress remoteIp = socket.getInetAddress();
while (true) {
// Receiving from client
String msg = in.readLine();
System.out.println("Client:" + clientNo + " " + remoteIp + ": " + msg);
if (msg.equals("exit")) {
System.out.println("Client:" + clientNo + " Asked to exit. Leaving connection");
break;
}
// Sending a string prepended with "Server:"
out.println("Server:" + msg);
out.flush();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
SimpleTCPClient.java:
package mar8;
import java.net.*;
import java.io.*;
public class SimpleTCPClient {
public static void main(String[] args) {
try {
Socket socket = new Socket("127.0.0.1", 8888);
// Define read/write from socket
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
String receiveMessage, sendMessage;
int i=0;
while (true) {
sendMessage = "Message " + ++i; // keyboard reading
boolean exit = false;
if(i==4) {
// ask server to break the connection
sendMessage = "exit";
exit = true;
}
System.out.println("Sending: " + sendMessage);
out.println(sendMessage); // sending to server
out.flush(); // flush the data
if(exit) {
System.out.println("Thank-You. Breaking Now.");
break;
}
if ((receiveMessage = in.readLine()) != null) {
System.out.println("Server Sent: " + receiveMessage); // show server's message
}
// wait for 0.5 sec
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
Sample Output:
Client1 Output:
Sending: Message 1
Server Sent: Server:Message 1
Sending: Message 2
Server Sent: Server:Message 2
Sending: Message 3
Server Sent: Server:Message 3
Sending: exit
Thank-You. Breaking Now.
Client2 Output:
Sending: Message 1
Server Sent: Server:Message 1
Sending: Message 2
Server Sent: Server:Message 2
Sending: Message 3
Server Sent: Server:Message 3
Sending: exit
Thank-You. Breaking Now.
and so on for other clients.
Server Output:
Main Thread: Waiting for client to connect...
1 Client connected
Main Thread: Waiting for client to connect...
Client:1 /127.0.0.1: Message 1
Client:1 /127.0.0.1: Message 2
Client:1 /127.0.0.1: Message 3
Client:1 /127.0.0.1: exit
Client:1 Asked to exit. Leaving connection
2 Client connected
Main Thread: Waiting for client to connect...
Client:2 /127.0.0.1: Message 1
3 Client connected
Main Thread: Waiting for client to connect...
Client:3 /127.0.0.1: Message 1
4 Client connected
Main Thread: Waiting for client to connect...
Client:4 /127.0.0.1: Message 1
5 Client connected
Main Thread: Waiting for client to connect...
Client:5 /127.0.0.1: Message 1
6 Client connected
Main Thread: Waiting for client to connect...
Client:6 /127.0.0.1: Message 1
7 Client connected
Main Thread: Waiting for client to connect...
Client:7 /127.0.0.1: Message 1
8 Client connected
Main Thread: Waiting for client to connect...
Client:8 /127.0.0.1: Message 1
Client:2 /127.0.0.1: Message 2
Client:3 /127.0.0.1: Message 2
Client:4 /127.0.0.1: Message 2
Client:5 /127.0.0.1: Message 2
Client:6 /127.0.0.1: Message 2
Client:7 /127.0.0.1: Message 2
Client:8 /127.0.0.1: Message 2
Client:2 /127.0.0.1: Message 3
Client:3 /127.0.0.1: Message 3
Client:4 /127.0.0.1: Message 3
Client:5 /127.0.0.1: Message 3
Client:6 /127.0.0.1: Message 3
Client:7 /127.0.0.1: Message 3
Client:8 /127.0.0.1: Message 3
Client:2 /127.0.0.1: exit
Client:2 Asked to exit. Leaving connection
Client:3 /127.0.0.1: exit
Client:3 Asked to exit. Leaving connection
Client:4 /127.0.0.1: exit
Client:4 Asked to exit. Leaving connection
Client:5 /127.0.0.1: exit
Client:5 Asked to exit. Leaving connection
Client:6 /127.0.0.1: exit
Client:6 Asked to exit. Leaving connection
Client:7 /127.0.0.1: exit
Client:7 Asked to exit. Leaving connection
Client:8 /127.0.0.1: exit
Client:8 Asked to exit. Leaving connection
9 Client connected
Main Thread: Waiting for client to connect...
Client:9 /127.0.0.1: Message 1
10 Client connected
Main Thread: Waiting for client to connect...
Client:10 /127.0.0.1: Message 1
11 Client connected
Main Thread: Waiting for client to connect...
Client:11 /127.0.0.1: Message 1
Client:9 /127.0.0.1: Message 2
Client:10 /127.0.0.1: Message 2
Client:11 /127.0.0.1: Message 2
Client:9 /127.0.0.1: Message 3
Client:10 /127.0.0.1: Message 3
Client:11 /127.0.0.1: Message 3
12 Client connected
Main Thread: Waiting for client to connect...
Client:12 /127.0.0.1: Message 1
Client:9 /127.0.0.1: exit
Client:9 Asked to exit. Leaving connection
Client:10 /127.0.0.1: exit
Client:10 Asked to exit. Leaving connection
Client:11 /127.0.0.1: exit
Client:11 Asked to exit. Leaving connection
Client:12 /127.0.0.1: Message 2
Client:12 /127.0.0.1: Message 3
Client:12 /127.0.0.1: exit
Client:12 Asked to exit. Leaving connection