Re: FileUpload Parameter Handling

[Adam Pelletier]

I fixed my problem.  My problem is that I had a Servlet that would serve up 
any number of Pages.  The way the navigation was wired was through 
keys/values pairs in the parameter list (i.e. req.getParameter("ID)).  So 
the HttpServletRequest itself would get passed down to a couple of different 
delgation layers.  Well in DiskFileUpload the parameters are stored 
differently in the Parts list and then have to be iterated over.  So all my 
code depended upon:

   // block 1
   req.getParameter("foo");
as opposed to
  // block 2
  Iterator iter = m_req_parts.iterator();
  while (iter.hasNext()) {
   FileItem fi = (FileItem) iter.next();
   if (fi.isFormField() && fi.getFieldName().equals("foo")) {
    return fi.getString();
   }
  }
So what I did is write an HttpServletRequestWrapper so when my code calls 
black 1 above, what really happens is block 2 above executes.

Thanks all for the help,
Adam
----- Original Message ----- 
From: "Michael McGrady" <[EMAIL PROTECTED]>
To: "Jakarta Commons Users List" <[EMAIL PROTECTED]>
Sent: Thursday, October 07, 2004 3:29 PM
Subject: Re: FileUpload Parameter Handling


I cannot see how a servlet stepping through parameter values could break an 
architecture.  What do you mean by that?  If the parameter is there, then 
the servlet can read it.  How that could affect architecture is not clear 
to me.  Can you guys explain what you mean?

Michael McGrady
Paul DeCoursey wrote:
I know what you are saying about it breaking your architecture... i use a
servlet that calls scripts based on a parameter, I found that using the
multipart-encoding broke that.  I later discovered that if I post the
multipart but have my parameter on the querystring it works fine.
Paul

No, this is just a plain servlet.  Another guy wrote that regular form
params show up in in the DiskFileUpload.
When you iterate through the values, you can test to see
if they are form fields with "isFormField"
Example:......................................
DiskFileUpload upload = new DiskFileUpload();
List           files  = upload.parseRequest(request);
Iterator       it             = files.iterator();
while(it.hasNext()){
  FileItem item = (FileItem)it.next();
  if(item.isFormField()){....
But that still breaks my architecture - although I can get to that
architecture if I have to.
Adam


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