从零开始学习Node.js系列教程二：文本提交与显示方法

从零开始文本方法 2022-06-04 17:06:00 189人浏览薄情痞子

摘要

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 = requ

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:

查看图片

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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