node.js 如何使用 ExpressJS 4 上传文件？
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How to upload files use ExpressJS 4?
提问by vcLwei
From ExpressJS 4 API, I find the req.files was invalid. How to upload files use ExpressJS 4 now?
从ExpressJS 4 API，我发现 req.files 无效。现在如何使用 ExpressJS 4 上传文件？
采纳答案by Vinz243
express.bodyParseris not included in express 4 by default. You must install separately. See https://github.com/expressjs/body-parser
express.bodyParser默认情况下不包含在 express 4 中。您必须单独安装。见https://github.com/expressjs/body-parser
Example :
例子 ：
var bodyParser = require('body-parser');
var app = connect();
app.use(bodyParser());
app.use(function (req, res, next) {
console.log(req.body) // populated!
next();
})
There is also node-formidable
还有节点强大的
var form = new formidable.IncomingForm();
form.parse(req, function(err, fields, files) {
res.writeHead(200, {'content-type': 'text/plain'});
res.write('received upload:\n\n');
res.end(util.inspect({fields: fields, files: files}));
});
return;
Here is how I did it:
这是我如何做到的：
form = new formidable.IncomingForm();
form.uploadDir = __dirname.getParent() + "/temp/";
form.parse(req, function(err, fields, files) {
var newfile, path, uid, versionName;
uid = uuid.v4();
newfile = __dirname.getParent() + "/uploads/" + uid;
copyFile(files.file.path, newfile, function(err) {
if (err) {
console.log(err);
req.flash("error", "Oops, something went wrong! (reason: copy)");
return res.redirect(req.url);
}
fs.unlink(files.file.path, function(err) {
if (err) {
req.flash("error", "Oops, something went wrong! (reason: deletion)");
return res.redirect(req.url);
}
// done!
// ...
});
});
});
回答by MikeSmithDev
I just had this issue after upgrading, where req.fileswas undefined. I fixed it by using multer.
升级后我刚刚遇到了这个问题，哪里req.files是未定义的。我使用multer修复了它。
So,
所以，
npm install multer
and then in your app.js
然后在你的 app.js
var multer = require('multer');
app.use(multer({ dest: './tmp/'}));
I didn't have to change anything else after that and all my old functionality worked.
在那之后我不必更改任何其他内容，我所有的旧功能都可以使用。
