WebSocket Server

A simple WebSocket server running on port 8080 that prints incoming messages to the server console.

Features

• WebSocket server listening on port 8080
• Prints all incoming messages to the console
• Displays connection/disconnection events
• Built with Java-WebSocket library

Requirements

• Java 21 or higher
• IntelliJ IDEA (recommended)

Setup

1. Open the project in IntelliJ IDEA
2. IntelliJ should automatically download the Java-WebSocket library (org.java-websocket:Java-WebSocket:1.5.6)
3. If the library is not downloaded automatically, you can:
   • Right-click on the project → Open Module Settings → Libraries
   • Add the library from Maven: org.java-websocket:Java-WebSocket:1.5.6

Running the Server

1. Open src/Main.java in IntelliJ IDEA
2. Run the main() method
3. The server will start on ws://localhost:8080
4. You should see: "WebSocket server is running on ws://localhost:8080"

Testing the Server

Option 1: Use the provided HTML test client

1. Open test-client.html in your web browser
2. Click the "Connect" button
3. Type a message and click "Send"
4. The message should appear in your server console

Option 2: Use browser console

Open your browser's developer console and run:

const ws = new WebSocket('ws://localhost:8080');
ws.onopen = () => console.log('Connected');
ws.onmessage = (event) => console.log('Received:', event.data);
ws.send('Hello from browser!');

Option 3: Use a WebSocket client tool

• Use tools like Postman, wscat, or any WebSocket client
• Connect to: ws://localhost:8080
• Send messages and watch them appear in the server console

Server Output

When messages are received, the server console will display:

Message received: Your message here

The server also logs:

• New connections: New connection from: /IP:PORT
• Disconnections: Connection closed: /IP:PORT - Reason: ...
• Errors: Full stack trace

Stopping the Server

Press Ctrl+C in the console or stop the application in IntelliJ IDEA.