Advanced Java Programming
Name :ASHWIN PAWAR CO5I Roll No. : 23
Practical : 16
Q. Write a program using Socket and ServerSocket to create Chat Application?
CODE:
Server code:
import java.io.*;
import java.net.*;
public class practical_16 {
// server program
public static void main(String[] args) throws IOException {
ServerSocket s = new ServerSocket(1254);
System.out.println("Server Started, waiting for client connection");
Socket sl = s.accept();
OutputStream out = sl.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.writeUTF("Hey there i am pranjal Shahane");
dos.close();
out.close();
sl.close();
s.close();
}
}
Client side code:
import java.io.*;
import java.net.*;
Advanced Java Programming
public class practical16A {
// client side
public static void main (String[] args) throws IOException {
Socket s1 = new Socket("localhost", 1254);
InputStream In = s1.getInputStream();
DataInputStream dis = new DataInputStream(In);
String st = new String(dis.readUTF());
System.out.println(st);
dis.close();
In.close();
s1.close();
}
}
OUTPUT:
Q. Write a program to develop prime number Server (Client will send any number to
server, Sever will send the response the number is prime or not)?
SERVER CODE :
import java.io.*;
import java.net.*;
public class practical_16_2_server {
public static void main(String[] args) throws IOException {
Advanced Java Programming
ServerSocket serverSocket = null;
Socket clientSocket = null;
try {
serverSocket = new ServerSocket(8002);
System.out.println("Server socket is created and waiting for a client");
clientSocket = serverSocket.accept();
System.out.println("Client connected from: " + clientSocket.getInetAddress());
DataInputStream inputStream = new
DataInputStream(clientSocket.getInputStream());
DataOutputStream outputStream = new
DataOutputStream(clientSocket.getOutputStream());
while (true) {
int number = inputStream.readInt();
System.out.println("Client sent number: " + number);
boolean isPrime = isPrime(number);
outputStream.writeBoolean(isPrime);
System.out.println("Response sent to client: " + isPrime);
}
} catch (IOException e) {
System.err.println("Error: " + e.getMessage());
} finally {
if (clientSocket != null) {
clientSocket.close();
}
if (serverSocket != null) {
serverSocket.close();
}
}
}
private static boolean isPrime(int num) {
if (num <= 1) {
Advanced Java Programming
return false;
}
for (int i = 2; i <= Math.sqrt(num); i++) {
if (num % i == 0) {
return false;
}
}
return true;
}
}
OUTPUT:
Client CODE:
import java.io.*;
import java.net.*;
public class practical_16_2_client {
public static void main(String[] args) throws IOException {
Socket clientSocket = null;
try {
clientSocket = new Socket(InetAddress.getLocalHost(), 8002);
System.out.println("Client socket is created and waiting for the server");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
DataInputStream inputStream = new
DataInputStream(clientSocket.getInputStream());
DataOutputStream outputStream = new
DataOutputStream(clientSocket.getOutputStream());
while (true) {
System.out.print("Enter a number to check for prime (or type 'exit' to quit): ");
Advanced Java Programming
String input = br.readLine();
if (input.equalsIgnoreCase("exit")) {
break;
}
try {
int number = Integer.parseInt(input);
outputStream.writeInt(number);
boolean isPrime = inputStream.readBoolean();
System.out.println(number + " is prime: " + isPrime);
} catch (NumberFormatException e) {
System.err.println("Invalid input. Please enter a valid number.");
}
}
} catch (IOException e) {
System.err.println("Error: " + e.getMessage());
} finally {
if (clientSocket != null) {
clientSocket.close();
}
}
}
}
OUTPUT:
