[英]Not able to execute a FileUpload program in Nodejs
我无法使用NodeJS上传文件并遇到以下异常。
例外:
TypeError: Cannot read property 'file' of undefined
at c:\nital\my-data\my-sample-apps\nodejs\tutorialspoint-samples\Sample37.js:22:26
at Layer.handle [as handle_request] (c:\nital\my-data\my-sample-apps\nodejs\tutorialspoint-samples\node_modules\express\lib\router\layer.js:95:5)
at next (c:\nital\my-data\my-sample-apps\nodejs\tutorialspoint-samples\node_modules\express\lib\router\route.js:131:13)
at Immediate.<anonymous> (c:\nital\my-data\my-sample-apps\nodejs\tutorialspoint-samples\node_modules\multer\lib\make-middleware.js:52:37)
at Immediate.immediate._onImmediate (timers.js:431:18)
at processImmediate [as _immediateCallback] (timers.js:374:17)
我对此进行了搜索,发现req.files
API在Express 4框架中不再可用,该框架在http://expressjs.com/api.html#req中提到
由于我是NodeJS的新手,因此不确定如何解决此问题。 有人可以指导吗? 我的实际程序在下面列出。
FileUploadDemo.js
//Express framework demo. File Upload demo
var express = require('express');
var app = express();
var fs = require("fs");
var bodyParser = require('body-parser');
var multer = require('multer');
app.use(express.static('public'));
app.use(bodyParser.urlencoded({extended: false}));
var upload = multer({dest: 'C:/tmp/'});
app.get('/upload.html', function (req, res) {
res.sendFile(__dirname + "/" + "upload.html");
});
//uploading the file here
//app.post('/file_upload', function (req, res) {
app.post('/file_upload', upload.single('file'), function (req, res) {
console.log(req.files.file.name);
console.log(req.files.file.path);
console.log(req.files.file.type);
var file = __dirname + "/" + req.files.file.name;
fs.readFile(req.files.file.path, function (err, data) {
fs.writeFile(file, data, function (err) {
if (err) {
console.log(err);
} else {
response = {
message: 'File uploaded successfully',
filename: req.files.file.name
};
}
console.log(response);
res.end(JSON.stringify(response));
});
});
});
var server = app.listen(8081, function () {
var host = server.address().address;
var port = server.address().port;
console.log("Example app listening at http://%s:%s", host, port)
});
由于您使用upload.single()
,因此可以通过req.file
而不是req.files.file
来访问该文件。 如果您上传了多个文件( upload.array()
或其他内容),则可以使用req.files
进行访问。
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