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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