Question

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How to upload files to server using JSP/Servlet?

I’m implementing a fileupload servlet that is used alongside resumable.js

Everytime I try to read a file, I either get a NoSuchElement exception or a NumberFormatException with a string inside the file I’m reading. I’m sure I made a hiccup somewhere, but can’t seem to tell

Here’s a snippet of what I use to read request and write to file

if(ServletFileUpload.isMultipartContent(request)){
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setRepository(new File(temp_dir));
            ServletFileUpload upload = new ServletFileUpload(factory);

            Iterator<FileItem> iter = upload.parseRequest(request).iterator();
            FileItem item = iter.next();
            OutputStream out;

            try {

                out = new FileOutputStream(new File(dest_dir));
                IOUtils.copy(item.getInputStream(), out);
                logger.debug("Wrote file " + resumableIdentifier + " with chunk number "
                        + resumableChunkNumber + " to " + temp_dir);

            } catch (FileNotFoundException fnfe) {

                fnfe.printStackTrace();

            }
        }

Did I do something wrong that is making the code actually read and interpret the contents of the file?

Answer 1

You have to iterate over the FileItems.
Right after this line:

Iterator<FileItem> iter = upload.parseRequest(request).iterator();

You should have something like this:

File dir = new File(dest_dir);
if (!dir.isDirectory()) dir.mkdirs();
while(iter.hasNext()) {
    FileItem item = iter.next();

Also do not forget to close the output stream for every file item.

out = new FileOutputStream(new File(dir, item.getName()));
IOUtils.copy(item.getInputStream(), out);
out.close();