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Chat Application in Java (Source Code)

Server Code

import java.io.*;
import java.net.*;

public class ChatServer {
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(12345)) {
            System.out.println("Server is running...");
            while (true) {
                Socket clientSocket = serverSocket.accept();
                new ClientHandler(clientSocket).start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

class ClientHandler extends Thread {
    private Socket socket;
    private PrintWriter out;
    private BufferedReader in;

public ClientHandler(Socket socket) {
        this.socket = socket;
    }

public void run() {
        try {
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);
            String message;
            while ((message = in.readLine()) != null) {
                System.out.println("Client: " + message);
                out.println("Echo: " + message);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

Client Code

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

public class ChatClient {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 12345);
             PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
             BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
             Scanner scanner = new Scanner(System.in)) {

String userInput;
            new Thread(() -> {
                try {
                    String serverResponse;
                    while ((serverResponse = in.readLine()) != null) {
                        System.out.println(serverResponse);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }).start();

while (true) {
                userInput = scanner.nextLine();
                out.println(userInput);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Instructions to Run

1. Compile the Code:-

‣ Save the server code in a file named ChatServer.java and the client code in ChatClient.java.

‣ Open your terminal and navigate to the directory where the files are located.

‣ Compile both files using:

2. Run the Server:-

‣ Start the server by running:

3. Run the Client:-

‣ Open another terminal window and run:

4. Chat:-

‣ Type messages in the client terminal. The server will echo back the messages.

With this code, you can develop Chat Application in Java to fit your needs.