如何将文件（exe或rar）提供给客户端从node.js服务器下载？
我有一个node.js服务器，它提供了一个index.html文本input的密码。 在通过服务器端口令检查后，客户端应该开始下载。 客户端应该无法看到文件位于服务器上的位置path。
这里是我的server.js：
var http = require('http'), qs = require('querystring'), fs = require('fs') ; console.log('server started'); var host = process.env.VCAP_APP_HOST || "127.0.0.1"; var port = process.env.VCAP_APP_PORT || 1337; http.createServer(function (req, res) { if(req.method=='GET') { console.log ( ' login request from ' + req.connection.remoteAddress ); fs.readFile(__dirname +'/index.html', function(error, content) { if (error) { res.writeHead(500); res.end(); } else { res.writeHead(200, { 'Content-Type': 'text/html' }); res.end(content, 'utf-8'); } }); } // method GET end else{ // method POST start console.log('POST request from ' + req.connection.remoteAddress); var body = ''; req.on('data', function (data) { body += data; if (body.length > 500) { // FLOOD ATTACK OR FAULTY CLIENT, NUKE REQUEST req.connection.destroy(); console.log('too much data')} }); req.on('end', function () { var postdata = qs.parse(body); var password = postdata.passwordpost ; if (password == '7777777') { console.log('the password is right, download starting'); // ??????????????????????????????????? here I need help from stackoverflow } else{ console.log ('password wrong'); fs.readFile(__dirname +'/wrongpassword.html', function(error, content) { if (error) { res.writeHead(500); res.end(); } else { res.writeHead(200, { 'Content-Type': 'text/html' }); res.end(content, 'utf-8'); } }); } }); // req on end function end } }).listen(port, host); 我需要帮助的部分是用????????
这里是我的index.html：
<html> <body> <br> <br> please enter your password to start your download <br> <br> <form method="post" action="http://localhost:1337"> <input type="text" name="passwordpost" size="50"><br><br> <input type="submit" value="download" /> </form> </body> </html>
你知道如何做到这一点？
当然，你可以在你的代码中使用它：
res.setHeader('Content-disposition', 'attachment; filename='+filename); //filename is the name which client will see. Don't put full path here. res.setHeader('Content-type', 'application/x-msdownload'); //for exe file res.setHeader('Content-type', 'application/x-rar-compressed'); //for rar file var file = fs.createReadStream(filepath); //replace filepath with path of file to send file.pipe(res); //send file
您需要声明并要求path ： path = require("path")
那么可以这样做：
var uri = url.parse(request.url).pathname , filename = path.join(process.cwd(), uri); path.exists(filename, function(exists) { if(!exists) { response.writeHead(404, {"Content-Type": "text/plain"}); response.write("404 Not Found\n"); response.end(); return; } response.writeHead(200); response.write(file, "binary"); response.end(); }
检查这些完整的例子 。
如果您愿意使用快速Web框架，那么可以以更简单的方式完成。
app.get('/download', function(req, res){ var file = __dirname + 'learn_express.mp4'; res.download(file); // Sets disposition, content-type etc. and sends it });
快速下载API
我在这里发现了一些关于fs.createReadStream（）的附加信息（尤其是error handling） ，并将其与user568109的答案结合起来。 这是我的工作downloadserver：
var http = require('http'), qs = require('querystring'), fs = require('fs') ; console.log('server started'); var host = process.env.VCAP_APP_HOST || "127.0.0.1"; var port = process.env.VCAP_APP_PORT || 1337; http.createServer(function (req, res) { if(req.method=='GET') { console.log ( ' login request from ' + req.connection.remoteAddress ); fs.readFile(__dirname +'/index.html', function(error, content) { if (error) { res.writeHead(500); res.end(); } else { res.writeHead(200, { 'Content-Type': 'text/html' }); res.end(content, 'utf-8'); } }); } // method GET end else{ // method POST start console.log('POST request from ' + req.connection.remoteAddress); var body = ''; req.on('data', function (data) { body += data; if (body.length > 500) { // FLOOD ATTACK OR FAULTY CLIENT, NUKE REQUEST req.connection.destroy(); console.log('too much data')} }); req.on('end', function () { var postdata = qs.parse(body); var password = postdata.passwordpost ; if (password == '7777777') { console.log('the password is right, download starting'); res.setHeader('Content-disposition', 'attachment; filename='+'test1.exe'); //filename is the name which client will see. Don't put full path here. res.setHeader('Content-type', 'application/x-msdownload'); //for exe file res.setHeader('Content-type', 'application/x-rar-compressed'); //for rar file var readStream = fs.createReadStream('/test1.exe'); //replace filepath with path of file to send readStream.on('open', function () { // This just pipes the read stream to the response object (which goes to the client) readStream.pipe(res); }); // This catches any errors that happen while creating the readable stream (usually invalid names) readStream.on('error', function(err) { console.log (err) ; res.writeHead(200, { 'Content-Type': 'text/html' }); res.end('an error occured', 'utf-8'); }); //send file } else{ console.log ('password wrong'); fs.readFile(__dirname +'/wrongpassword.html', function(error, content) { if (error) { res.writeHead(500); res.end(); } else { res.writeHead(200, { 'Content-Type': 'text/html' }); res.end(content, 'utf-8'); } }); } }); // req on end function end } }).listen(port, host);