Student Activity

Student Activity (30-min)

Step-by-Step Procedure

1. Write a Program to Read, Write, and Append Data to a File Using the fs Module (15 min):

   • Step 1: Create a file named fileOperations.js.

   • Step 2: Add the following code:

     javascript코드 복사const fs = require('fs');
     
     // Write to a file
     fs.writeFile('example.txt', 'This is an example file.', (err) => {
       if (err) throw err;
       console.log('File created and written to.');
     
       // Read the file
       fs.readFile('example.txt', 'utf8', (err, data) => {
         if (err) throw err;
         console.log('File content:', data);
     
         // Append to the file
         fs.appendFile('example.txt', '\nAppended text.', (err) => {
           if (err) throw err;
           console.log('Content appended to file.');
         });
       });
     });

   • Step 3: Run the script:

     bash코드 복사node fileOperations.js

   • Expected Output:

     • File is created and written to.

     • Content is read from the file and displayed.

     • Additional content is appended to the file.

2. Create a Simple HTTP Server Using the http Module (15 min):

   • Step 1: Create a file named httpServer.js.

   • Step 2: Add the following code:

     javascript코드 복사const http = require('http');
     
     const server = http.createServer((req, res) => {
       if (req.url === '/') {
         res.writeHead(200, { 'Content-Type': 'text/plain' });
         res.end('Welcome to the Home Page');
       } else if (req.url === '/about') {
         res.writeHead(200, { 'Content-Type': 'text/plain' });
         res.end('This is the About Page');
       } else {
         res.writeHead(404, { 'Content-Type': 'text/plain' });
         res.end('404 Not Found');
       }
     });
     
     server.listen(3000, () => {
       console.log('Server running at http://localhost:3000');
     });

   • Step 3: Run the script:

     bash코드 복사node httpServer.js

   • Step 4: Test the server:

     • Visit http://localhost:3000/ for the Home Page.

     • Visit http://localhost:3000/about for the About Page.

     • Visit http://localhost:3000/unknown to test the 404 response.