Random picture server.

random_pic.js

var fs = require('fs'),
    path = require('path'),
    http = require('http'),
    url = require('url');
//Params
const imageDir = '/home/steve/图片/miyamori_avatar/'
const imageURL = '/pic.jpg';
const servePort = 8080;

function getRandFile() {
    var pics = fs.readdirSync(imageDir);
    var randomNum = getRandomInt(pics.length);
    function getRandomInt(max) {
        return Math.floor(Math.random() * Math.floor(max));
    }
    console.log("The random one is: ", pics[randomNum]);
    return pics[randomNum];
}

http.createServer(function (req, res) {
    var pathname = url.parse(req.url).pathname;
    if (pathname == imageURL) {
        var randImg = imageDir + getRandFile();
        res.writeHead(200, { 'Content-Type': 'image/png' });
        res.end(fs.readFileSync(randImg));
    } else {
        res.writeHead(404, { "Content-Type": "text/plain" });
        res.end("Nothing but chicken!");
    }

}).listen(servePort);

console.log('Server running at http://127.0.0.1:' + servePort + '/');