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

rush: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

rush: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,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

rush:js;"> function route(handle,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

rush:js;"> //var querystring = require("querystring");

function start(response,postData) {
console.log("Request handler 'start' was called.");

var body = ''+
''+
''+
''+
''+
'<form action="/upload" method="post">'+
'<textarea name="text" rows="20" cols="60">'+
''+
''+
''+
'';

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/