nodejs记录2——一行代码实现文件下载

主要使用fs模块的pipe方法，简单粗暴：

import fs from "fs";
import path from 'path';
import request from 'request';

const movieDir = "./";

const movieName = "download_movie";

const url = "http://img4.imgtn.bdimg.com/it/u=2389140428,1315216178&fm=23&gp=0.jpg";

request.get(url).pipe(fs.createWriteStream(path.join(movieDir, movieName + '.jpg')));

输出一张图片：

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

http.createServer(function(req, res) {
    fs.createReadStream("./20170313185619.png").pipe(res);
}).listen(3000, "127.0.0.1");

上传图片：

var express = require('express')
var multer = require('multer')

var app = express()
var storage = multer.diskStorage({
    //设置上传后文件路径，uploads文件夹会自动创建。
    destination: function(req, file, cb) {
        cb(null, './uploads')
    },
    //给上传文件重命名，获取添加后缀名
    filename: function(req, file, cb) {
        var fileFormat = (file.originalname).split(".");
        cb(null, file.fieldname + '-' + Date.now() + "." + fileFormat[fileFormat.length - 1]);
    }
});
//添加配置文件到muler对象。
var upload = multer({
    storage: storage
});

app.post('/profile', upload.single('avatar'), function(req, res, next) {
    // req.file 是 `avatar` 文件的信息
    res.send("upload success")
});

app.listen(3000);