Send Image from android to Node.js using AsyncHttpClient

Question

I'd like to send image from android app to node.js server to save into MongoDB on server side. I use AsyncHttpClient to post request.

My code is like this:

Android ->

RequestParams param = new RequestParams();
param.put("email", email);
param.put("image", file, "image/jpg");

System.out.println("Param : " + param);
HttpClient.post("uploadImg_Profile/", param, new AsyncHttpResponseHandler() {

Node.js ->

app.js->
app.post('/uploadImg_Profile/', function(req, res){
    uploadImg_Profile.uploadImg_Profile(req, res);
})

uploadImg_Profile.js->

exports.uploadImg_Profile= function(req, res){
    var User = new user({ 
        email : req.body.email,
        img : req.body.image
    });
    //
    console.log("req : " + req);

    console.log("email : "+ User.email);
    console.log("image : " + User.img);

But console.log result is undefined. I respect that this is seen jhgdsfejdi734634jdhfdf like this BSON type result.

1. How can I get img data?

2. There is a way to get file's type from File object dynamically?

Answer 1

You need to use the right type of body parser in your node.js code - from the result you are getting, it looks as if you're not interpreting it as a multipart form.

You need to register the middleware to use to interpret the POST, for example, using the multer parser:

app.js:

var multer = require('multer');

app.use(bodyparser.json());
app.use(multer({ inMemory: true, putSingleFilesInArray: true }));

app.post('/uploadImg_Profile/', function(req, res){
    uploadImg_Profile.uploadImg_Profile(req, res);
});

uploadImg_Profile.js:

exports.uploadImg_Profile= function(req, res){
    var User = new user({ 
        email : req.body.email,
        img : req.files['image'][0].buffer
    });

    console.log("req : " + req);

    console.log("email : "+ User.email);
    console.log("image : " + User.img);
}

Multer will also populate various other properties about the file, so you should be able to retrieve the type of the image from that using:

req.files['image'][0].mimetype

See the multer page on github for all the goodness.

EDIT: Added bodyparser.json as well as multer.

Answer 2

It is solved. It is possible that both app.use(bodyparser) and app.use(multer) are used simultaneously.

app.use(bodyparser.json()) app.use(multer())

Like this.

And my previous problem is another points. I don't know exactly what make it doing. I just change express version from 3.x to 4.x and test various situation. In this progress, I find out that req has image buffer properly, and can get buffer data.

Thanks Mark and all of you intereted in my question.