File Upload Servlet

[Ryan Lowe]

All,
I am trying to upload a file via an HTTP <INPUT TYPE="FILE" NAME="file_part"> parameter using Servlets. I have downloaded the O'reilly packages, and gotten them to work ... but I am having trouble writing my own (learn by doing ). I have tried:
File f = new File ( request.getParameter ( "file_part" ) ); (which throws a NullPointerException, regardless of whether the field is populated).
AND too many hours of fruitless labor. Any suggestions? I can manipulate files fine, but I just can't GET the file
Thanks,
Ryan Lowe

[Malhar Barai]

hi..
Plz do a search on this forum on "file upload", go through the results, your problem would be solved by that.
hth
MB

[Torsten Schippel]

Hi Ryan,
try a BufferedReader to read the lines posted by your form.

bis= new BufferedInputStream(request.getInputStream());
InputStreamReader isr = new InputStreamReader(bis,"ISO_8859_1");
br = new BufferedReader(isr);
while ( (line = br.readLine()) != null) {
...

You should find the difference between a normal form POST and an "multipart/form-data" POST.
Then you may be able to write your own multipart parser.
Regards
Torsten

[Ryan Lowe]

Thank you Torsten. That provided me with the direction I needed Also, Malhar ... Most of the references on JavaRanch point to the oreilly packages or other libraries, not instructions on how to do it *manually*.
Thanks Again,
R