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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