从零开始学习Node.js例子二 文本提交与显示

时间:2021-02-17 03:35:39

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() {
console.log("data received ending" + pathname);
route(handle, pathname, response, postData);
});
} http.createServer(onRequest).listen(8888);
console.log("Server has started.");
} exports.start = start;

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 the text: "+
querystring.parse(postData).text);
response.end();
} exports.start = start;
exports.upload = upload;

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;

result:

从零开始学习Node.js例子二  文本提交与显示 从零开始学习Node.js例子二  文本提交与显示 从零开始学习Node.js例子二  文本提交与显示

从零开始学习Node.js例子二  文本提交与显示

从零开始学习Node.js例子二  文本提交与显示

知识点:

require和exports的用法:

index.js中代码

var Hello = require('.hello');

hello = new Hello();
hello.setName('Joey');
hello.sayHello();

hello.js中代码

function Hello(){
var name; this.setName = function(thyName){
name = thyName;
} this.sayHello = function(){
console.log('Hello ' + name);
}
} //exports.Hello = Hello; //此时我们在其他文件中需要通过 require('./hello').Hello来获取Hello对象,这种写法有点冗余
module.exports = Hello; //输出的就是Hello对象本身,不是上面的exports,上面的是暴露.Hello,.Hello赋予了Hello对象