Upload Angularjs image with Java server

Question

I’m having a problem uploading a web image, I’m using the angular file upload, when I upload it saves the image in the folder Frame -> Images of the browser, and when I will read the inputStream there on my server it does not return the image. How to solve the problem?

Answer 1

I believe there is a misconception in your code. First you retrieve an item like this:

FileItemStream item = iterator.next();

Then, while reading the bytes of the file, you recover the InputStream general request:

while ((read = req.getInputStream().read(bytes)) != -1) { ... }

However, the code should retrieve the InputStream of the item, thus:

InputStream inputStream = item.openStream();
while ((read = inputStream.read(bytes)) != -1) { ... }

After all, the request could have more fields and files, it’s not even?

Anyway, I refactored a little the code you posted in the comments and I came to this:

if (ServletFileUpload.isMultipartContent(req)) {

    FileItemFactory fileItemFactory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(fileItemFactory);
    FileItemIterator iterator = upload.getItemIterator(req);
    while (iterator.hasNext()) {

        FileItemStream item = iterator.next();
        if (item.getName() != null) {

            File uploadedFile = new File(path + "/" + item.getName());

            byte[] bytes = new byte[2048];
            int read = 0;
            OutputStream outpuStream = new FileOutputStream(new File(uploadedFile.getAbsolutePath()));
            InputStream inputStream = item.openStream();
            while ((read = inputStream.read(bytes)) != -1) {
                outpuStream.write(bytes, 0, read);
            }
            outpuStream.close();
        }

    }

}