nodejs_socket_file_server

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//  tcp_file_client.js
var net = require("net")
var fs = require("fs");
const { EventEmitter } = require('events');
var fileName;
EventEmitter.setMaxListeners(0)
net.createServer(function (socket) {
    // new connection
    fileName = parseInt(Math.random() * 10000000000000);
    fileName = fileName.toString(16).toUpperCase()+ ".png";
    socket.write('Some string');
    socket.on('data',function (data) {
        fs.writeFile(fileName ,data, { flag: "a+" },( error) => {
            console.log("write file error", error)
        }, cb => {
            console.log("write file success", cb);
        }
        );
        socket.on('end', function (data) {
            // connection closed
            console.log("file transfer end once")
        });
    })
}).listen(4001);