详解Node.Js如何处理post数据

实现思路

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["/"] = 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 name="text" 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http://localhost: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 name="text" 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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