Node.js中的TCP套接字和文件操作

Question

I am new to Node.js and I have 2 questions about it:

• Can you create regular TCP sockets on the server's side?
• Is it possible to read/write to a file on the server's side?

That's all. Both of these are critical for putting my program on the web.

Answer 1

Node has inbuilt modules that have the functionality you're looking for. You can create raw TCP sockets on the server side with the native net module.

var net = require('net');
net.createServer(function(socket) {
  socket.write('data');
  socket.end();
});

And there is also a fs module for file system manipulation:

var fs = require('fs');

var data = 'a string';
var file = './file';

fs.writeFile(file, data, function(err) {
  if (err) throw err;
  // file has been written to disk
});

// or synchronously writing a file
fs.writeFileSync(file, data);

// fetch the data asynchronously
fs.readFile(file, function(err, data) {
  // we have "a string"
});

// synchronously reading a file
var str = fs.readFileSync(file);