node.jsの入力ストリーム

// 
var fs = require("fs");
var data = "";
// 
var readStreams = fs.createReadStream('D:\a.txt');
// utf-8 
readStreams.setEncoding('UTF-8');
// 
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(" ");

utilフレームワーク

//util node.js   
//utl.inherts 
var util = require("util");
// Base
function Base() {
    // 
    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  base  
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);

// 
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));

getのコンテンツを取得

// get 
var http = require('http');
var url = require('url');
var util = require('util');
http.createServer(function (req,res) {
    res.writeHead(200,{'Content-Type':'text/plain'});
    // parse 
    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 = '';     // post ， 

    req.on('data', function(chunk){    // req data ， ， post 
        post += chunk;
    });

    req.on('end', function(){    // end ， querystring.parse post POST ， 。
        post = querystring.parse(post);
        res.end(util.inspect(post));
    });
}).listen(3000);

//os 
var os = require('os');
console.log(os.type());

netモジュール小型サーバ等の構築に使用

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

//クライアントの作成

var net = require('net');
// 
var client = net.connect({port:8080},function() {
    console.log(' ');

});
client.on('data',function (data) {
    console.log(data.toString());
    client.end;
});
client.on('end',function () {
    console.log(' ');
});

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

Webサーバの作成

var http = require('http');
var fs = require('fs');
var url = require('url');


//  
http.createServer( function (request, response) {
    //  ， 
    var pathname = url.parse(request.url).pathname;

    //  
    console.log("Request for " + pathname + " received.");

    //  
    fs.readFile(pathname.substr(1), function (err, data) {
        if (err) {
            console.log(err);
            // HTTP  : 404 : NOT FOUND
            // Content Type: text/plain
            response.writeHead(404, {'Content-Type': 'text/html'});
        }else{
            // HTTP  : 200 : OK
            // Content Type: text/plain
            response.writeHead(200, {'Content-Type': 'text/html'});

            //  
            response.write(data.toString());
        }
        //   
        response.end();
    });
}).listen(8081);

//  
console.log('Server running at http://127.0.0.1:8081/');

// web 
var http = require('http');
// 
var options = {
    host:'localhost',
    port:'8081',
    path:'/index,htm',
};
// 
var callback;
callback = function (response) {
    // 
    var body = '';
    response.on('data', function (data) {
        body += data;
    });
    response.on('end', function () {
        // 
        console.log(body);
    });
    // 
    var req = http.request(options, callback);
    req.end;
};

ルートによってアクセスするサブページを設定

var express = require('express');
var app = express();
// hello world
app.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  
//  POST  
app.post('/', function (req, res) {
    console.log("  POST  ");
    res.send('Hello POST');
});
app.use(express.static('public'));
//listuser 
app.get('/list_user',function (req,res) {
    res.send(" ");
})

htmlのページを傍受する

<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>

は、その後、応答および返信を行う

<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>

ルーティングパラメータの設定

// 
app.param('newId',function (req,res,next,newId) {
    req.newId = newId;
    next();
});
//   
app.get('/news/:newId',function (req,res) {
    res.end('newId:' + req.newId + '
');
})