why can't use request.getParameter when jsp form's enctype is "multipart/form-data"

[alex han]

i use oreilly's com.oreilly.servlet.MultipartRequest for upload file ,and the code was write in a struts action:

  
  MultipartRequest multi = new MultipartRequest(request,
              dir, 5 * 1024 * 1024, "gb2312",
              new DefaultFileRenamePolicy());
...................................

in a jsp,the code is:

  
<form name="callingform" method=post  enctype="multipart/form-data">
.............
<td width="125"  class="t7r"><input type="file" name="uploadFile"></td>

now i need refresh that jsp,because there is a "select" in jsp,when use "select",a javascript function was invoke.
and the code is :

 
form1.action="";
form1.sumbit;
 

i need use request.getParameter in this jsp,so i can remeber what i have selected last time..
how can i use request.getParameter when there is enctype in form.
because if there is enctype in form ,request.getParameter always return null.

[Andres Gonzalez]

https://coderanch.com/t/355356/Servlets/java/Servlets-HTML-forms-multipart-form

[alex han]

thanks.but now i only want to know,when i use enctype="multipart/form-data" in jsp. how can i get the value that should return by request.getParameter

[Brian Pipa]

If you'r eusing a 3rd-party library for the parsing, it usually has methods to get the parameters. If you're doing it yourself, it's tricky but doable. I did it with my upload web-app FileNabber - http://fn.filenabber.com

You should be able to look at the source of any of the 3rd-party libraries and see how they did it.

brian