Java : Saving uploaded png image

Question

I am having issue when i save a png file uploaded by user . It loses its transparency . Here is how I save it .

 ServletFileUpload upload = new ServletFileUpload(factory);

        ProgressListenerImpl listener = new ProgressListenerImpl();
        UploadProgressBar uop = new UploadProgressBar(listener);

        List<FileItem> fileItemsList = upload.parseRequest(request);

        for(FileItem fi : fileItemsList) {
///get name etc.
    File fNew= new File(fileLocation, justName);
            fi.write(fNew);
        }

it puts a black background . Any other way to save it as png ?

Answer 1

If you're creating a BufferedImage on the server side, make sure you create it as a type that supports the alpha channel, eg

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

Paul