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To connect Socket.IO with Node.js using the MVC model, you can follow these steps:

Install the Socket.IO and Express.js packages using npm:

npm install socket.io express

Create an app.js file that initializes an Express.js app and sets up Socket.IO to listen on the same server:

const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io')(server);

server.listen(3000);

Create a routes directory that contains your MVC route files, such as index.js, users.js, etc. Each route file should define the route handling logic for a specific part of your application. For example, the index.js route file might look like this:

const express = require('express');
const router = express.Router();

router.get('/', function(req, res, next) {
    res.render('index', { title: 'Socket.IO + Express.js + MVC' });
});

module.exports = router;

In the app.js file, load the MVC routes and set up the Express.js app to use them:

const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io')(server);

// Load MVC routes
const index = require('./routes/index');
const users = require('./routes/users');

// Use MVC routes
app.use('/', index);
app.use('/users', users);

server.listen(3000);

To handle Socket.IO events, you can define event handlers in the app.js file or in separate Socket.IO controller files. For example, you could define a socket.js file that contains the following code:

module.exports = function(io) {
    io.on('connection', function(socket) {
        console.log('A user connected');

        socket.on('disconnect', function() {
            console.log('A user disconnected');
        });

        socket.on('chat message', function(msg) {
            io.emit('chat message', msg);
        });
    });
}

Then, in the app.js file, you can load the socket.js file and pass the io object to it, allowing it to register event handlers:

const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io')(server);

// Load Socket.IO controller
const socketController = require('./socket')(io);

// Load MVC routes
const index = require('./routes/index');
const users = require('./routes/users');

// Use MVC routes
app.use('/', index);
app.use('/users', users);

server.listen(3000);

With this setup