using apache fileupload on GAE

Question

I use Apache Commons FileUpload in a java server-side app that has a html form with fields :

A destination fied that will be filled with email address of the destination mailbox
A message text with a message of the sender
A < input type=file ... field for uploading a photo. I can receive uploaded file (as a stream) but how

This app I want to upload on GAE . I can receive uploaded file (as a stream , using org.apache.commons.fileupload.FileItemStream).

I want to receive too input textfields (i.e. 1) and 2)) - completed by the user of app)

I want to access these using org.apache.commons.fileupload.FileItem but I receive java.rmi.server.UID is a restricted class

Writting file on GAE is not allowed.

gigadot
– gigadot

2011-04-21 11:27:57 +00:00
Commented Apr 21, 2011 at 11:27 — gigadot
– gigadot, Commented Apr 21, 2011 at 11:27
@gigadot Who said anything about writing files?

Nick Johnson
– Nick Johnson

2011-04-22 05:52:17 +00:00
Commented Apr 22, 2011 at 5:52 — Nick Johnson
– Nick Johnson, Commented Apr 22, 2011 at 5:52

Frodo Baggins · Accepted Answer · 2015-04-17 22:12:14Z

10

You should use the FileItemIterator of the Apache Commons FileUpload.

import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import java.io.InputStream;
..
public void doPost(HttpServletRequest req, HttpServletResponse res)
      throws ServletException, IOException {
    try {
      ServletFileUpload upload = new ServletFileUpload();
      res.setContentType("text/plain");

      FileItemIterator iterator = upload.getItemIterator(req);
      while (iterator.hasNext()) {
        FileItemStream item = iterator.next();
        String name = item.getFieldName();
        InputStream stream = item.openStream();

        if (item.isFormField()) {
          //regular form field
          resp.getWriter().println(("Form:" + name + " : " + Streams.asString(stream));
        } else {
          //fileform field 
          resp.getWriter().println(("File:" +name + " : " + item.getName());
        }

      }
    } catch (Exception ex) {
      throw new ServletException(ex);
    }
}

edited Apr 17, 2015 at 22:12

Frodo Baggins

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answered Apr 21, 2011 at 12:40

systempuntoout

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1 Comment

andrew pate Over a year ago

I was using a FileItemIterator... List<FileItem> fileItemsList = uploader.parseRequest(request); Iterator<FileItem> fileItemsIterator = fileItemsList.iterator(); ... but this was throwing a NullPointer at org.apache.commons.fileupload.disk.DiskFileSystem.getTempFil‌e because there is no file system... So your code that uses FileItemStream instead works fine on GAE... Thanks lots for posting

Justin Morgan · Accepted Answer · 2011-04-21 19:25:57Z

1

Take a look at this: Google App Engine and FileUpload

You can't write directly to the filesystem in GAE, but take a look at GAEVFS, which uses the datastore and memcache to emulate a filesystem.

edited Apr 21, 2011 at 19:25

answered Apr 21, 2011 at 11:52

Justin Morgan

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2 Comments

aurel Over a year ago

I do not want to make use of persistence on Google cloud , I want to use Streaming futures from FileUpload. I have already sent pictures but having 1) and 2) hard-coded in the servlet . But I do not how to get these 2 field dynamically ie typed by user of app.

andrew pate Over a year ago

Oops ment to comment on the answer above

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