node.js入门小实例

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为了更深入的了解js，最近开始研究node.js
server.js(服务器启动模块)

var http       = require('http');#包含此模块是为了创建服务器var url        = require('url');#包含此模块是为了解析url  function start(route,handle) {    function onRequest(request,response) {        console.log('server received');        var pathname    = url.parse(request.url).pathname;#获得请求的路径是start还是upload或是其它        console.log("Request for " + pathname + " received.");         route(handle,pathname,response);#调用route来进行路由分发    }    http.createServer(onRequest).listen(8888);#创建一个http服务器，onRequest回调函数作为参数传递。每当有一个请求到达时，都会交由回调函数来处理    console.log('Server has started.');}exports.start   =   start; #提供其他模块可以使用的方法接口

router.js(路由调度模块)

function route(handle,pathname,response) {    console.log("About to route a request for"+pathname);    if (typeof handle[pathname] === 'function') {        return handle[pathname](response);        #如果handle对象中有此请求url的处理程序，则调用    }else{     console.log("No request handler found for " + pathname);     response.writeHead(404, {"Content-Type": "text/plain"});     response.write("404 Not found"); response.end();    }}exports.route = route;

requestHandlers.js(请求处理模块)

    var exec    = require("child_process").exec;    function start(response) {    console.log("Request handler 'start' was called.");    #在linux根目录下执行find命令，最长时间为10s，将输出的结果用response对象返回到网页，exec方法是异步的，exec的回调函数对请求作出相应，但代码的执行是同步的，所以如果同时请求start和upload，则都可以正常访问。称为非阻塞操作。    exec("find /", { timeout: 10000, maxBuffer: 20000*1024 }, function (error, stdout, stderr) {     response.writeHead(200, {"Content-Type": "text/plain"});    response.write(stdout);    response.end();     });    }     function upload(response) {     console.log("Request handler 'upload' was called.");    response.writeHead(200, {"Content-Type": "text/plain"});    response.write("Hello Upload");     response.end();    }    exports.start = start;    exports.upload = upload;

index.js(主模块)

var server           = require("./server.js");var router           = require("./router");var requestHandlers  = require("./requestHandlers");#将已经写好的三个模块包含进来var handle           = {};handle["/"]          = requestHandlers.start;handle["/start"]     = requestHandlers.start;handle["/upload"]    = requestHandlers.upload;#现在此创建一个handle对象，键为请求的url，值为处理此请求的函数server.start(router.route,handle);

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