node.js的输入流

//读入流var fs = require("fs");var data = "";//创建可读流var readStreams = fs.createReadStream('D:\a.txt');//设置编码为utf-8编码readStreams.setEncoding('UTF-8');//处理流事件readStreams.on('data',function (chunk) {    data += chunk;});readStreams.on('end',function () {    console.log(data);});readStreams.on('error',function (err) {    console.log(err.stack);});console.log("程序执行完毕");

util框架

//util是一个node.js核心模块 提供常见函数的集合//utl.inherts提供原型之间的继承var util = require("util");//定义了基础对象Basefunction Base() {    //属性和一个构造函数    this.name = 'base';    this.base = 1991;    this.sayHello = function () {        console.log('hello' + this.name);    }}Base.prototype.showName = function () {    console.log(this.name);}function  Sub() {    this.name = 'sub';}//sub 继承自base 来进行util.inherits(Sub,Base);var objName = new Base();objName.showName();objName.sayHello();console.log(objName);var objSub = new Sub();objSub.showName();//objSub.sayHello();console.log(objSub);

//将对象转化为字符串var util = require('util');function Person() {    this.name = 'bb';    this.toString = function () {        return this.name;    };}var obj = new Person();console.log(util.inspect(obj));console.log(util.inspect(obj,true));

获取get的内容

//获取get请求中的内容var http = require('http');var url = require('url');var util = require('util');http.createServer(function (req,res) {    res.writeHead(200,{'Content-Type':'text/plain'});    //用parse函数来进行解析    res.end(util.inspect(url.parse(req.url,true)));}).listen(3000);

var http = require('http');var querystring = require('querystring');var util = require('util');http.createServer(function(req, res){    var post = '';     //定义了一个post变量，用于暂存请求体的信息    req.on('data', function(chunk){    //通过req的data事件监听函数，每当接受到请求体的数据，就累加到post变量中        post += chunk;    });    req.on('end', function(){    //在end事件触发后，通过querystring.parse将post解析为真正的POST请求格式，然后向客户端返回。        post = querystring.parse(post);        res.end(util.inspect(post));    });}).listen(3000);

//os模块提供一些基本的系统函数var os = require('os');console.log(os.type());

net模块用于构建小型服务器等

var net = require('net');var server = net.createServer(function(connection) {    console.log('client connected');    connection.on('end', function() {        console.log('客户端关闭连接');    });    connection.write('Hello World!\r\n');    connection.pipe(connection);});server.listen(8080, function() {    console.log('server is listening');});

//创建客户端

var net = require('net');//连接到指定的地址和端口var client = net.connect({port:8080},function() {    console.log('连接到服务器');});client.on('data',function (data) {    console.log(data.toString());    client.end;});client.on('end',function () {    console.log('断开与服务器的连接');});

//dns用于解析域名var dns = require('dns');dns.lookup('www.github.com',function onLookup(err,address,family){    console.log('ip地址',address);    dns.reverse(address,function (err,hostname) {        if(err){            console.log(err.stack);        }        console.log('反向解析' + address + JSON.stringify(hostname));    })})

创建web服务器

var http = require('http');var fs = require('fs');var url = require('url');// 创建服务器http.createServer( function (request, response) {    // 解析请求，包括文件名    var pathname = url.parse(request.url).pathname;    // 输出请求的文件名    console.log("Request for " + pathname + " received.");    // 从文件系统中读取请求的文件内容    fs.readFile(pathname.substr(1), function (err, data) {        if (err) {            console.log(err);            // HTTP 状态码: 404 : NOT FOUND            // Content Type: text/plain            response.writeHead(404, {'Content-Type': 'text/html'});        }else{            // HTTP 状态码: 200 : OK            // Content Type: text/plain            response.writeHead(200, {'Content-Type': 'text/html'});            // 响应文件内容            response.write(data.toString());        }        //  发送响应数据        response.end();    });}).listen(8081);// 控制台会输出以下信息console.log('Server running at http://127.0.0.1:8081/');

//创建web客户端var http = require('http');//用于请求的项var options = {    host:'localhost',    port:'8081',    path:'/index,htm',};//处理响应的回调函数var callback;callback = function (response) {    //不断更新数据    var body = '';    response.on('data', function (data) {        body += data;    });    response.on('end', function () {        //数据接收完成        console.log(body);    });    //向服务端发送请求    var req = http.request(options, callback);    req.end;};

由路由来设置访问的子页面

var express = require('express');var app = express();//主页输出hello worldapp.get('/',function (req,res) {    res.send('hello world');});var sever = app.listen(3000,function () {    var host = sever.address.address;    var port = sever.address.port;    console.log(host,port);});//post 请求//  POST 请求app.post('/', function (req, res) {    console.log("主页 POST 请求");    res.send('Hello POST');});app.use(express.static('public'));//listuser页面的响应app.get('/list_user',function (req,res) {    res.send("用户列表页面");})

监听html的页面

<html><body><form action = "http://127.0.0.1:3000/process_get" method="GET">    FirstName:<input type = "text" name = "first_name"><br>    LastName:<input type="text" name = "last_name">    <input type="submit" value="Submit"></form></body></html>

随后进行响应和返回

<html><body><form action = "http://127.0.0.1:3000/process_get" method="GET">    FirstName:<input type = "text" name = "first_name"><br>    LastName:<input type="text" name = "last_name">    <input type="submit" value="Submit"></form></body></html>

设置路由参数

//设置路由参数app.param('newId',function (req,res,next,newId) {    req.newId = newId;    next();});//设置参数 注意冒号app.get('/news/:newId',function (req,res) {    res.end('newId:' + req.newId + '\n');})