Node_JS

//http://www.nodebeginner.org/index-zh-cn.html#how-our-server-handles-requests 按照这个页面的例子写的，留作笔记
//index.js
var server = require('./server');
var route = require('./routes');
var requestHandlers = require("./requestHanlders");

var handle = {};
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
handle["/show"] = requestHandlers.show;

server.start( route.route ,handle)

//server.js 基本的逻辑都在这边

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

function start( route, handle ){
    http.createServer( function(request, response){
        var pathname = url.parse( request.url).pathname;
        console.log( pathname );

        var postData = "";
/*
        request.setEncoding("utf8");
        request.addEventListener('data',function(chunk){
            postData += chunk;
        });
        request.addEventListener('end',function(){
            route(handle, pathname, response ,postData)
        });
*/
        request.setEncoding("utf8");

        //addEventListener ？ addListener
        request.addListener("data", function(postDataChunk) {
            postData += postDataChunk;
            console.log("Received POST data chunk '"+
                postDataChunk + "'.");
        });

        request.addListener("end", function() {
            route(handle, pathname, response, postData);
        });

        //route( handle ,pathname ,response);
        /*
        response.writeHead(
            200,
            {
                "Content-Type" : "text/plain"
            }
        );
        response.write(data);
        response.end();
        console.log(' server is open');
        */
    } ).listen(8000);
};

exports.start = start

//传数据到route文件

function route( handle, pathname ,response, postData){
    console.log( "route a " + pathname );
    if( typeof handle[pathname] === 'function'){
        return handle[pathname]( response ,postData );
    }else{
        console.log('no Request')
        return "404 NOT FOUND"
    }
};

exports.route = route;

//展示结果页面的主要业务神马的

var querystring = require("querystring");
var fs = require("fs");

function start( response ,postData){
    console.log("request handler start")
     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.writeHead(200, {"Content-Type": "text/plain"});
        response.write(body);
        response.end();
};
function upload( response ,postData){
    console.log("request handler upload");
    console.log( postData )
    response.writeHead("200",{
        "Content-Type" : "text/html"
    });
    response.write( querystring.parse(postData).text );
    response.end()
};
function show(response, postData){
    console.log('request img');
    fs.readFile('./1.png','binary',function(err, data){
        if(err){
            response.writeHead(200,{
                "Content-Type" : "text/html"
            });
            response.write('err');
            response.end();
        }else{
            response.writeHead(200,{
                "Content-Type" : "image/png"
                //"Content-Type" : "image/png"
            });
            response.write(data,'binary');
            response.end();
        }
    })
}

exports.start = start;
exports.upload = upload;
exports.show = show;

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原文地址：https://www.cnblogs.com/diligenceday/p/3491209.html