[appengine-java] Managing file upload and form parameters at the same time

[lai]

According to the FAQ we are suppose to handle file uploads using the
given example. I added some code in the isFormField block to attempt
to capture input parameters. However this caused
org.apache.commons.fileupload.FileItemStream.ItemSkippedException.

Anyone is able to this successfully?


import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import java.io.InputStream;
import java.io.IOException;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class FileUpload extends HttpServlet {
  private static final Logger log =
      Logger.getLogger(FileUpload.class.getName());

  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();
        InputStream stream = item.openStream();

        if (item.isFormField()) {
          log.warning("Got a form field: " + item.getFieldName());

//i added this
if(item.getName().equals("myInputParam")) {
  String myInputParam = Streams.asString(stream);
}

        } else {
          log.warning("Got an uploaded file: " + item.getFieldName() +
                      ", name = " + item.getName());

          // You now have the filename (item.getName() and the
          // contents (which you can read from stream).  Here we just
          // print them back out to the servlet output stream, but you
          // will probably want to do something more interesting (for
          // example, wrap them in a Blob and commit them to the
          // datastore).
          int len;
          byte[] buffer = new byte[8192];
          while ((len = stream.read(buffer, 0, buffer.length)) != -1)
{
            res.getOutputStream().write(buffer, 0, len);
          }
        }
      }
    } catch (Exception ex) {
      throw new ServletException(ex);
    }
  }
}

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