利用 http 模块开始写简单的web服务。
模块：
const http=require(‘http‘);const fs=require(‘fs‘);const path=require(‘path‘);function startServer() { ???let onRequest=function (req,res) { ???????console.log(‘recived a request.‘); ???????res.writeHead(200,{‘Content-Type‘:‘text/html‘}); ???????let wwwdir= path.resolve(__dirname,‘../www‘); ???????// console.log(wwwdir); ???????let readStream = fs.createReadStream(wwwdir+‘/bbb.html‘); ???????readStream.pipe(res); ???}; ???let server=http.createServer(onRequest); ???server.listen(80,‘192.168.1.101‘);};exports.startServer = startServer;调用者，APP，使用两行就开启了一个简单的web服务。
let server=require(‘./mod_server‘);server.startServer();
单文件版路由，响应了几个不同的页面：
const http = require(‘http‘);const fs = require(‘fs‘);const path = require(‘path‘);let wwwdir = path.resolve(__dirname, ‘../www‘);let onRequest = function (req, res) { ???console.log(‘recived a request. ‘ + req.url); ???if (req.url === ‘/‘ || req.url === ‘/home‘) { ???????res.writeHead(200, {‘Content-Type‘: ‘text/html;charset=UTF-8‘}); ???????let readStream = fs.createReadStream(wwwdir + ‘/index.html‘); ???????readStream.pipe(res); ???} else if (req.url === ‘/about‘) { ???????res.writeHead(200, {‘Content-Type‘: ‘text/html;charset=UTF-8‘}); ???????let readStream = fs.createReadStream(wwwdir + ‘/about.html‘); ???????readStream.pipe(res); ???} else if (req.url === ‘/api‘) { ???????res.writeHead(200, {‘Content-Type‘: ‘application/json‘}); ???????let jsonObj = { ???????????name: "alex", ???????????email: ‘abc@gg.com‘, ???????????age: 32 ???????}; ???????// console.log(JSON.parse(jsonStr)); // 反序列化 ???????res.end(JSON.stringify(jsonObj)); ???} else { ???????res.writeHead(404, {‘Content-Type‘: "text/html;charset=utf8"}); ???????res.write(‘抱歉 404 ,你要的页面没找到.‘); ???} ???;};let server = http.createServer(onRequest);server.listen(8001, ‘localhost‘);分开为独立文件的 web server
一、server.js
const http = require(‘http‘);function startServer(route, handle) { ???let onRequest = function (request, response) { ???????console.log(‘Request received ‘ + request.url); ???????// 传递到 route 函数 ???????route(handle, request.url, response); ???}; ???let server = http.createServer(onRequest); ???server.listen(8001, ‘127.0.0.1‘); ???console.log(‘Server started on 127.0.0.1:8001‘);}module.exports.startServer = startServer;二、router.js
const fs = require(‘fs‘);const path = require(‘path‘);let wwwdir = path.resolve(__dirname, ‘../www‘);function route(handle, pathname, response) { ???console.log(‘Routing a request for ‘ + pathname); ???// 判断 handle中是否有对应的 pathname 函数 ???if (typeof handle[pathname] === ‘function‘) { ???????handle[pathname](response); // response作为参数传递到 handle 函数 ???} else { ???????response.writeHead(404, {‘Content-Type‘: ‘text/html‘}); ???????fs.createReadStream(wwwdir + ‘/404.html‘, ‘utf8‘).pipe(response); ???}}module.exports.route = route;三、handler.js
const fs = require(‘fs‘);const path = require(‘path‘);let wwwdir = path.resolve(__dirname, ‘../www‘);function home(response) { ???response.writeHead(200, {‘Content-Type‘: ‘text/html‘}); ???fs.createReadStream(wwwdir + ‘/index.html‘, ‘utf8‘).pipe(response);}function review(response) { ???response.writeHead(200, {‘Content-Type‘: ‘text/html‘}); ???fs.createReadStream(wwwdir + ‘/about.html‘, ‘utf8‘).pipe(response);}function api_records(response) { ???response.writeHead(200, {‘Content-Type‘: ‘application/json‘}); ???let jsonObj = { ???????name: "Alex", ???????passwd: "123456", ???????email: ‘aaa@cc.com‘, ???????age: 22 ???}; ???response.end(JSON.stringify(jsonObj));}module.exports = { ???home: home, ???review: review, ???api: api_records};四、app.js 主程序，模块方式调用前面的三个文件即可
const server = require(‘./server‘);const router = require(‘./router‘);const handler = require(‘./handler‘);let handle = {};handle["/"] = handler.home;handle[‘/home‘] = handler.home;handle[‘/review‘] = handler.review;handle[‘/api‘] = handler.api;server.startServer(router.route, handle);最近学习的 Node.js 之 http
原文地址：https://www.cnblogs.com/FHBIAO/p/10174587.html