如何将服务器中的文件下载到访问nodeJS服务器中的页面的机器上?
我正在使用ExpressJS，我一直在尝试这个:
app.get('/download', function(req, res){
var file = fs.readFileSync(__dirname + '/upload-folder/dramaticpenguin.MOV', 'binary');
res.setHeader('Content-Length', file.length);
res.write(file, 'binary');
res.end();
});
但是我无法获得文件名和文件类型(或扩展名)。有人能帮我一下吗?
当前回答
'use strict';
var express = require('express');
var fs = require('fs');
var compress = require('compression');
var bodyParser = require('body-parser');
var app = express();
app.set('port', 9999);
app.use(bodyParser.json({ limit: '1mb' }));
app.use(compress());
app.use(function (req, res, next) {
req.setTimeout(3600000)
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept,' + Object.keys(req.headers).join());
if (req.method === 'OPTIONS') {
res.write(':)');
res.end();
} else next();
});
function readApp(req,res) {
var file = req.originalUrl == "/read-android" ? "Android.apk" : "Ios.ipa",
filePath = "/home/sony/Documents/docs/";
fs.exists(filePath, function(exists){
if (exists) {
res.writeHead(200, {
"Content-Type": "application/octet-stream",
"Content-Disposition" : "attachment; filename=" + file});
fs.createReadStream(filePath + file).pipe(res);
} else {
res.writeHead(400, {"Content-Type": "text/plain"});
res.end("ERROR File does NOT Exists.ipa");
}
});
}
app.get('/read-android', function(req, res) {
var u = {"originalUrl":req.originalUrl};
readApp(u,res)
});
app.get('/read-ios', function(req, res) {
var u = {"originalUrl":req.originalUrl};
readApp(u,res)
});
var server = app.listen(app.get('port'), function() {
console.log('Express server listening on port ' + server.address().port);
});
其他回答
使用res.download ()
它以“附件”的形式传输路径上的文件。例如:
var express = require('express');
var router = express.Router();
// ...
router.get('/:id/download', function (req, res, next) {
var filePath = "/my/file/path/..."; // Or format the path using the `id` rest param
var fileName = "report.pdf"; // The default name the browser will use
res.download(filePath, fileName);
});
阅读更多关于res.download()
我是这样做的:
创建文件 发送文件到客户端 删除文件
代码:
let fs = require('fs');
let path = require('path');
let myController = (req, res) => {
let filename = 'myFile.ext';
let absPath = path.join(__dirname, '/my_files/', filename);
let relPath = path.join('./my_files', filename); // path relative to server root
fs.writeFile(relPath, 'File content', (err) => {
if (err) {
console.log(err);
}
res.download(absPath, (err) => {
if (err) {
console.log(err);
}
fs.unlink(relPath, (err) => {
if (err) {
console.log(err);
}
console.log('FILE [' + filename + '] REMOVED!');
});
});
});
};
在快车4号。x时，Response有一个attachment()方法:
res.attachment();
// Content-Disposition: attachment
res.attachment('path/to/logo.png');
// Content-Disposition: attachment; filename="logo.png"
// Content-Type: image/png
更新
Express有一个助手，可以让生活更轻松。
app.get('/download', function(req, res){
const file = `${__dirname}/upload-folder/dramaticpenguin.MOV`;
res.download(file); // Set disposition and send it.
});
旧的答案
就你的浏览器而言，文件的名称只是“下载”，所以你需要通过使用另一个HTTP头来给它更多的信息。
res.setHeader('Content-disposition', 'attachment; filename=dramaticpenguin.MOV');
你可能还想发送一个mime类型，比如:
res.setHeader('Content-type', 'video/quicktime');
如果你想了解更深入的内容，请点击这里。
var path = require('path');
var mime = require('mime');
var fs = require('fs');
app.get('/download', function(req, res){
var file = __dirname + '/upload-folder/dramaticpenguin.MOV';
var filename = path.basename(file);
var mimetype = mime.lookup(file);
res.setHeader('Content-disposition', 'attachment; filename=' + filename);
res.setHeader('Content-type', mimetype);
var filestream = fs.createReadStream(file);
filestream.pipe(res);
});
您可以将标题值设置为您喜欢的任何值。在本例中，我使用mime类型库- node-mime来检查文件的mime类型。
这里需要注意的另一件重要的事情是，我更改了您的代码以使用readStream。这是一种更好的方式，因为使用任何名称中带有“Sync”的方法都是不受欢迎的，因为节点意味着异步。
'use strict';
var express = require('express');
var fs = require('fs');
var compress = require('compression');
var bodyParser = require('body-parser');
var app = express();
app.set('port', 9999);
app.use(bodyParser.json({ limit: '1mb' }));
app.use(compress());
app.use(function (req, res, next) {
req.setTimeout(3600000)
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept,' + Object.keys(req.headers).join());
if (req.method === 'OPTIONS') {
res.write(':)');
res.end();
} else next();
});
function readApp(req,res) {
var file = req.originalUrl == "/read-android" ? "Android.apk" : "Ios.ipa",
filePath = "/home/sony/Documents/docs/";
fs.exists(filePath, function(exists){
if (exists) {
res.writeHead(200, {
"Content-Type": "application/octet-stream",
"Content-Disposition" : "attachment; filename=" + file});
fs.createReadStream(filePath + file).pipe(res);
} else {
res.writeHead(400, {"Content-Type": "text/plain"});
res.end("ERROR File does NOT Exists.ipa");
}
});
}
app.get('/read-android', function(req, res) {
var u = {"originalUrl":req.originalUrl};
readApp(u,res)
});
app.get('/read-ios', function(req, res) {
var u = {"originalUrl":req.originalUrl};
readApp(u,res)
});
var server = app.listen(app.get('port'), function() {
console.log('Express server listening on port ' + server.address().port);
});
