Javascript 如何用AngularJS上传文件并用ExpressJS保存？

我正在使用AngularJS指令，称为AngularFile upload。我已经设置好了，图像上传工作正常，但是我似乎无法将文件解析到服务器端（expressjs）

杰德：

这是AngularJS的代码：

$scope.onFileSelect = function($files) {

    console.log($files);

    for (var i = 0; i < $files.length; i++) {
        var file = $files[i];
        $scope.upload = $upload.upload({
            url: '/api/user/upload', 
            method: 'POST',
            data: {myObj: $scope.userAvatarFile},
            file: file, 
        }).progress(function(evt) {
            console.log('percent: ' + parseInt(100.0 * evt.loaded / evt.total));
        }).success(function(data, status, headers, config) {
            console.log(data);
        });
    }
};

对于express，控制台始终打印以下内容：

 {}
 undefined

---

有什么问题吗？

中删除了多部分中间件。Connect建议使用或。IMHO

connect busboy

更好，下面介绍如何操作：

（当然，运行

npm安装--save connect busboy

）

---

如果要将图像保存到文件中，可以执行以下操作：

exports.upload = function (req, res) {
    req.busboy.on('file', function (fieldname, file, filename) {
        // saveTo is the temporary path
        var saveTo = path.join(os.tmpDir(), path.basename(fieldname));
        file.pipe(fs.createWriteStream(saveTo));

        // Do stuff with saveTo
    });
};

但是，这是一种安全风险（保存到磁盘，这就是req.files不再存在的原因），因此大多数使用文件的（？）库（例如Cloudinary）都提供了WriteStream（或看起来和感觉上类似的东西）。以下是它如何与Cloudinary配合使用：

exports.upload = function (req, res) {
    req.busboy.on('file', function (fieldname, file, filename) {
        var stream = cloudinary.uploader.upload_stream(function(result) { console.log(result); });

        // You should have been able to do file.pipe(stream), but Cloudinary's stream isn't a real WriteStream, but just an object with two functions. Well, the following works too:

        file.on('data', stream.write);
        file.on('end', stream.end);
    });
};

FWIW，我复制了你的代码并测试了它，它工作得很好。如果你有任何问题，请告诉我。一周前我也遇到了同样的问题，所以我开始研究它。

使用Cloudinary的示例不再适用于Cloudinary v1.1.1。Cloudinary更新了upload_stream方法以返回Transform stream对象。因此，使用“管道”而不是手动将事件添加到on（'data'）和on（'end'）

---

upload（）函数是一个异步函数。。你可以像这样在循环中使用它，你已经发送了数组中的所有文件并保存了。我不太明白你想说什么，你能重写它吗？

// Main file, stays the same for all the other examples
var express = require('express'),
    busboy  = require('connect-busboy');

app.use(busboy({ immediate: true }));

// Route file
exports.upload = function (req, res) {
    req.busboy.on('file', function (fieldname, file, filename) {
        // fieldname will be 'file', file will be... um... the file (in binary encoding), filename will be the file's name
    });
    req.busboy.on('field', function (key, value) {
        // key will be 'myObj', value will be $scope.userAvatarFile
    });
};

exports.upload = function (req, res) {
    req.busboy.on('file', function (fieldname, file, filename) {
        // saveTo is the temporary path
        var saveTo = path.join(os.tmpDir(), path.basename(fieldname));
        file.pipe(fs.createWriteStream(saveTo));

        // Do stuff with saveTo
    });
};

exports.upload = function (req, res) {
    req.busboy.on('file', function (fieldname, file, filename) {
        var stream = cloudinary.uploader.upload_stream(function(result) { console.log(result); });

        // You should have been able to do file.pipe(stream), but Cloudinary's stream isn't a real WriteStream, but just an object with two functions. Well, the following works too:

        file.on('data', stream.write);
        file.on('end', stream.end);
    });
};

exports.upload = function (req, res) {
    req.busboy.on('file', function (fieldname, file, filename) {
        var stream = cloudinary.uploader.upload_stream(function(result) {    console.log(result); 
        });

        // pipe can be used now
        file.pipe(stream);
    });
};