发布于 2017-01-25 02:28:27 | 247 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Node.js教程，程序狗速度看过来！

Node.js 服务器端的JavaScript

Node.js 是一个基于Chrome JavaScript 运行时建立的一个平台， 用来方便地搭建快速的 易于扩展的网络应用· Node.js 借助事件驱动， 非阻塞I/O 模型变得轻量和高效， 非常适合 运行在分布式设备 的 数据密集型 的实时应用

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这篇文章主要介绍了Nodejs实现的一个静态服务器实例,本文实现的静态服务器实例包含cache功能、压缩功能等,需要的朋友可以参考下

参考cnodejs.org上面的静态服务器例子，写了下面的一个nodejs静态服务器例子，里面包含cache,压缩，贴代码如下：

/**

 * 静态文件服务器测试例子

 * User: xuwm

 * Date: 13-5-17

 * Time: 上午8:38

 * To change this template use File | Settings | File Templates.

 */

var port=3333;

var http = require("http");

var url = require("url");

var fs = require("fs");

var path = require("path");

var mime = require("./mime").types;

var config = require("./config");

var zlib = require("zlib");

//创建http服务端

var server=http.createServer(function(request,response){

    var obj= url.parse(request.url);

    response.setHeader("Server","Node/V8");

    console.log(obj);

    var pathname=obj.pathname;

    if(pathname.slice(-1)==="/"){

        pathname=pathname+config.Welcome.file;   //默认取当前默认下的index.html

    }

    var realPath = path.join("assets", path.normalize(pathname.replace(/\.\./g, "")));

    console.log(realPath) ;

    var pathHandle=function(realPath){

    //用fs.stat方法获取文件

        fs.stat(realPath,function(err,stats){

            if(err){

                response.writeHead(404,"not found",{'Content-Type':'text/plain'});

                response.write("the request "+realPath+" is not found");

                response.end();

            }else{

                if(stats.isDirectory()){

                }else{

                    var ext = path.extname(realPath);

                    ext = ext ? ext.slice(1) : 'unknown';

                    var contentType = mime[ext] || "text/plain";

                    response.setHeader("Content-Type", contentType);

                    var lastModified = stats.mtime.toUTCString();
                    var ifModifiedSince = "If-Modified-Since".toLowerCase();
                    response.setHeader("Last-Modified", lastModified);

                    if (ext.match(config.Expires.fileMatch)) {
                        var expires = new Date();
                        expires.setTime(expires.getTime() + config.Expires.maxAge * 1000);
                        response.setHeader("Expires", expires.toUTCString());
                        response.setHeader("Cache-Control", "max-age=" + config.Expires.maxAge);
                    }

                    if (request.headers[ifModifiedSince] && lastModified == request.headers[ifModifiedSince]) {
                        console.log("从浏览器cache里取")
                        response.writeHead(304, "Not Modified");
                        response.end();
                    } else {
                        var raw = fs.createReadStream(realPath);
                        var acceptEncoding = request.headers['accept-encoding'] || "";
                        var matched = ext.match(config.Compress.match);

                        if (matched && acceptEncoding.match(/\bgzip\b/)) {
                            response.writeHead(200, "Ok", {'Content-Encoding': 'gzip'});
                            raw.pipe(zlib.createGzip()).pipe(response);
                        } else if (matched && acceptEncoding.match(/\bdeflate\b/)) {
                            response.writeHead(200, "Ok", {'Content-Encoding': 'deflate'});
                            raw.pipe(zlib.createDeflate()).pipe(response);
                        } else {
                            response.writeHead(200, "Ok");
                            raw.pipe(response);
                        }
                    }
                }
            }
        });

    }
    pathHandle(realPath);
});
server.listen(port);
console.log("http server run in port:"+port);

exports.types = {