Node.js入门（下）

Stream

const fs = require('fs')
//读取流
const rs = fs.createReadStream('./01.png')
//写入流
const ws = fs.createWriteStream('./02.png')
//把读取和写入对接 目的是复制01的图片 取名为02
rs.pipe(ws)

http web服务模块

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <h1>Hello Node</h1>
    <img src="01.png" alt=""/>
</body>
</html>

api.js


//文件读取
const fs = require('fs')

// http:用于创建web服务的模块
//创建一个http服务器
const http = require('http')
//读取文件服务器
const server = http.createServer((request,response)=>{
    //打印原型链  request和response都是steam
    // console.log('request',getPrototypeChain(request));
    // console.log('response',getPrototypeChain(response));
    const {url,method,headers} = request
    //是首页并且是get请求
    if(url === '/' && method === 'GET'){
        //读取html 首页
        fs.readFile('index.html',(err,data) => {
            if(err){
                //设置一组
                response.writeHead(500,{
                    'Content-Type':'text/plain;charset=utf-8'
                })
                response.end('服务器错误')
            }
            response.statusCode = 200
            //设置一个
            response.setHeader('Content-Type','text/html')
            response.end(data)
        })
    }else if(url === '/users' && method === 'GET'){
        //读取/users json
        response.writeHead(200,{
            'Content-Type':'application/json'
        })
        response.end(JSON.stringify([{name: 'laowang'}]))
    }else if(method === 'GET' && headers.accept.indexOf('image/*') !== -1){
        //读取图片
        fs.createReadStream('.'+url).pipe(response)
    }else{
        //找不到页面
        response.statusCode = 404
        response.setHeader('Content-Type','text/plain;charset=utf-8')
        response.end('404页面没有找到')
    }
    // response.end('a response')
})

server.listen(3000);
//node api.js运行完毕 在浏览器输入http://localhost:3000/ 查看

Node.js入门（下）

Stream

http web服务模块

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