Multi-threaded Client-Server Communication in Java

Overview

This project demonstrates a multi-threaded client-server communication in Java using sockets. The server listens for incoming connections and spawns a new thread for each client. The client creates multiple concurrent connections to the server and exchanges messages.

---

Features

✅ Multi-threaded server to handle multiple clients concurrently
✅ Multi-threaded client to initiate multiple parallel connections
✅ Efficient resource management using try-with-resources
✅ Socket communication over port 8010
✅ Timeout handling for the server (70 seconds)

---

Requirements

• Java 8 or later
• Any Java IDE (e.g., IntelliJ IDEA, Eclipse, VS Code)

---

How It Works

Server (Server.java)

• Creates a ServerSocket on port 8010.
• Listens for incoming client connections.
• For each client, starts a new thread to handle communication.
• Sends a greeting message to the client.

Client (Client.java)

• Creates 100 concurrent connections to the server using threads.
• Each client sends a message to the server.
• Waits for the response and prints it.

How to Run

Step 1: Compile the Code

javac Server.java Client.java

Step 2: Run the Server

java Server

(The server will start listening on port 8010.)

Step 3: Run the Client

java Client

(100 clients will connect to the server, send messages, and receive responses.)

---

Expected Output

Server Output

Server is listening on port 8010
Accepted Connection: /127.0.0.1:XXXXX
Accepted Connection: /127.0.0.1:XXXXX
...

Client Output

Response from Server: Hello from server /127.0.0.1
Response from Server: Hello from server /127.0.0.1
...

---

Notes

• The server runs indefinitely until stopped manually.
• The server timeout is 70 seconds, after which it will throw a SocketTimeoutException if no connection is made.
• Clients terminate after receiving the server response.

---

Enhancements (Future Improvements)

• Use ThreadPoolExecutor for better performance instead of creating a new thread per client.
• Implement bidirectional communication (server can also read messages from clients).
• Add logging instead of using System.out.println().
• Implement secure communication with SSL/TLS.

---

Author

Your Name

Feel free to contribute or report issues!

Devesh