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从零开始学习Node.js系列教程二：文本提交与显示方法

2017-04-13 10:33 1031 查看

本文实例讲述了Node.js文本提交与显示方法。分享给大家供大家参考，具体如下：

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:

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

希望本文所述对大家nodejs程序设计有所帮助。

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标签： Node.js 文本

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