将data和end事件的回调函数直接放在服务器中，在data事件回调中收集所有的POST数据，当接收到所有数据，触发end事件后，其回调函数调用请求路由，并将数据传递给它，然后，请求路由再将该数据传递给请求处理程序。
实现步骤
第一步我们设置了接收数据的编码格式为UTF-8，第二步注册了“data”事件的监听器，用于收集每次接收到的新数据块，并将其赋值给postData 变量，最后第三步我们将请求路由的调用移到end事件处理程序中，以确保它只会当所有数据接收完毕后才触发，并且只触发一次。我们同时还把POST数据传递给请求路由
示例代码
index.js
var server = require("./server"); var router=require("./router"); var requestHandlers=require("./requestHandlers"); var handle = {} handle["https://www.jb51.net/"] = requestHandlers.start; handle["/start"] = requestHandlers.start; handle["/upload"] = requestHandlers.upload; server.start(router.route,handle);
server.js
var http = require("http"); var url=require("url"); function start(route,handle) { function onRequest(request, response) { var postData=""; var pathname=url.parse(request.url).pathname; console.log("Request for"+pathname+"received."); request.setEncoding("utf8"); request.addListener("data", function(postDataChunk) { postData += postDataChunk; console.log("Received POST data chunk '"+ postDataChunk + "'."); }); request.addListener("end", function() { route(handle, pathname, response, postData); }); //route(handle,pathname,response); //response.writeHead(200, {"Content-Type": "text/plain"}); //response.write("this is a demo"); //response.end(); } http.createServer(onRequest).listen(5656,'127.0.0.1'); console.log("Server has started. localhost:5656"); } exports.start = start;
router.js
function route(handle,pathname,response,postData){ console.log("About to route a request for"+pathname); if(typeof handle[pathname]=='function'){ handle[pathname](response,postData); } 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
//var querystring = require("querystring"); function start(response,postData) { console.log("Request handler 'start' was called."); var body = '<html>'+ '<head>'+ '<meta http-equiv="Content-Type" content="text/html; '+ 'charset=UTF-8" />'+ '</head>'+ '<body>'+ '<form action="/upload" method="post">'+ '<textarea rows="20" cols="60"></textarea>'+ '<input type="submit" value="Submit text" />'+ '</form>'+ '</body>'+ '</html>'; response.writeHead(200, {"Content-Type": "text/html"}); response.write(body); response.end(); } function upload(response,postData) { console.log("Request handler 'upload' was called."); response.writeHead(200, {"Content-Type": "text/plain"}); response.write("You've sent: " + postData); response.end(); } exports.start = start; exports.upload = upload;
运行：node mynode/index
浏览器输入:5656/
结果：
在文本框里输入“I LOVE YOU” 点击提交
使用querystring模块只提取文本，修改一下requestHandlers.js使只返回文本
var querystring = require("querystring"); function start(response,postData) { console.log("Request handler 'start' was called."); var body = '<html>'+ '<head>'+ '<meta http-equiv="Content-Type" content="text/html; '+ 'charset=UTF-8" />'+ '</head>'+ '<body>'+ '<form action="/upload" method="post">'+ '<textarea rows="20" cols="60"></textarea>'+ '<input type="submit" value="Submit text" />'+ '</form>'+ '</body>'+ '</html>'; response.writeHead(200, {"Content-Type": "text/html"}); response.write(body); response.end(); } function upload(response,postData) { console.log("Request handler 'upload' was called."); response.writeHead(200, {"Content-Type": "text/plain"}); response.write("You've sent: " + querystring.parse(postData).text); response.end(); } exports.start = start; exports.upload = upload;
重新启动,依旧输入I LOVE YOU ，提交
总结
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