完整示例代碼參考Content-Disposition

Contents

• Startup

• Node

• HTTP

Startup

mkdir node-download && cd node-download

npm init && cnpm i --save express

vim app.js

var express = require('express');
var app = express();

app.get('/', function (req, res) {
    res.send('Hello World!');
});

app.listen(3000, function () {
    console.log('服務(wù)啟動');
});

node app.js

curl localhost:3000

Node

vim app.js

var fs = require('fs');
var express = require('express');
var app = express();

app.get('/preview', function (req, res) {
    var filename = 'image.jpg';
    res.sendFile(filename, {
        root: __dirname
    });
});

app.get('/download', function (req, res) {
    var filename = 'image.jpg';
    res.download(filename);
});

app.get('/deleteAfterDownload', function (req, res) {
    var filename = 'temp.jpg';
    fs.writeFileSync(filename, fs.readFileSync('image.jpg'));
    var stream = fs.createReadStream(filename);
    stream.once("end", function () {
        stream.destroy();
        fs.unlinkSync(filename);
    }).pipe(res);
});

app.listen(3000, function () {
    console.log('服務(wù)啟動');
});

node app.js

• 瀏覽器打開 http://localhost:3000/preview

• 瀏覽器打開http://localhost:3000/download

• 瀏覽器打開http://localhost:3000/deleteAfterPreview

HTTP

curl -I localhost:3000/download
# Content-Disposition: attachment; filename="image.jpg"

vim app.js

app.get('/deleteAfterDownload', function (req, res) {
    var filename = 'temp.jpg';
    fs.writeFileSync(filename, fs.readFileSync('image.jpg'));
    var stream = fs.createReadStream(filename);
    res.set('Content-Disposition', 'attachment; filename="temp.jpg"');
    stream.once("end", function () {
        stream.destroy();
        fs.unlinkSync(filename);
    }).pipe(res);
});

ndoe app.js

• 瀏覽器打開http://localhost:3000/deleteAfterDownload

HTTP協(xié)議Content-Disposition響應(yīng)頭: inline(默認(rèn)值)表示在網(wǎng)頁中顯示 attachment表示下載至本地