Node.js零起点开发(六)-处理POST请求

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本节我们做一个简单的demo,post数据，并且接受数据

requestHandlers的模块

应用程序需要新的部件，因此加入新的模块 -- 已经无需为此感到新奇了。我们来创建一个叫做requestHandlers的模块，并对于每一个请求处理程序，添加一个占位用函数，随后将这些函数作为模块的方法导出：

requestHandlers的模块

start() : POSt表单HTML

upload : POST数据获取页面

requestHandlers.js

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;

router模块

通过检查给定的路径对应的请求处理程序是否存在，如果存在的话直接调用相应的函数，并返回相应是字符串

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;

server模块

处理请求模块

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);    });  }  http.createServer(onRequest).listen(8888);  console.log("Server has started.");}exports.start = start;

index模块

启动模块，主模块

index.js

var server = require("./server");var router = require("./router");var requestHandlers = require("./requestHandlers");var handle = {}//区分大小写的handle["/"] = requestHandlers.start;handle["/start"] = requestHandlers.start;handle["/upload"] = requestHandlers.upload;server.start(router.route, handle);

运行后效果

如果现在启动应用（node index.js，始终记得这个命令行），随后请求一个URL，我请求的是http://localhost:8888/，然后显示的是一个form表单，输入数据后提交表单后就会跳转到http://localhost:8888/upload，你将会看到应用输出相应的信息，这表明我们的HTTP服务器已经在使用路由模块了，并会将请求的路径传递给路由，路由再找到对应的处理函数：