Forum:

why doesn't request.getParameter( "j_username" ) work?

Ranch Hand

Posts: 33

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Friends,
I am trying to based my content on the user that has logged in.
I am basically using the logon.jsp from the J2EE 1.4 tutorial ...

... and I want to use the value of j_username in this jsp ...

<%@ page import = "java.io.*,java.util.*" %>
<HTML>
<HEAD><TITLE>example jsp</TITLE></HEAD>
<BODY>
<FORM action='upload.jsp' method='POST' enctype='multipart/form-data'>
<TABLE>
<% 
String xyz_UpLoadUser = request.getParameter( "j_username" ); // "XYZ_001";
String propFileName = "xyz_UpLoad";
ResourceBundle rb = ResourceBundle.getBundle( propFileName, request.getLocale());
try { 
try { 
String values = rb.getString(xyz_UpLoadUser);
String[] vlist = values.split( " " );
int i=0;
for ( i=0; i < vlist.length; i++ ) {
out.println( 
"<TR><TD>" + vlist[I] + 
"</TD><TD>:<INPUT type=file id=\"fldFile_" + i + 
"\" name=\"fldFile_" + i + "\"></TD></TR>" 
);
}
out.println( 
"<input type=hidden name=\"xyz_UpLoadUser\" value=\"" + xyz_UpLoadUser + "\">" 
); 
out.println( "<input type=hidden name=\"maxFilestoUpLoad\" value=\"" + i + "\">" ); 
} catch (Exception e) { 
out.println( "<TR><TD>Could not load props </TD></TR>" ); 
}
} catch (Exception e) { 
out.println( "<TR><TD>Could not create ResourceBundle for [" + propFileName + "]</TD></TR>" ); 
}
%>
<TR><TD COLSPAN=2><INPUT type=submit id='btnSubmit' name='btnSubmit' value='Upload File(s)'></TD></TR>
</TABLE></FORM></BODY></HTML>

... and here is the HTMl that gets generated ...

I tink that I am not getting anything from the request.getParameter( "j_username" ); call.
What am I doing wrong?

Sadanand Murthy

Ranch Hand

Posts: 382

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Where is the action j_security_check implemented? Is the form submitting to a servlet? How is the 2nd jsp getting displayed? Is the request getting dispatched to the 2nd jsp?
Request object is specific to a request. What is likely happening is that the form is getting submitted & its request is being processed (perhaps in a servlet) & the servlet is displaying the next jsp. The 2nd jsp will not have access to the request object of the 1st jsp unless you forward the request & response objects via the RequestDispatcher.
If you are using a servlet you can do the following:
getServletContext().getRequestDispatcher(urlForJSP).forward(request, response)

Ever Existing, Ever Conscious, Ever-new Bliss

Sheldon Plankton

Ranch Hand

Posts: 33

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Where is the action j_security_check implemented? Is the form submitting to a servlet? How is the 2nd jsp getting displayed? Is the request getting dispatched to the 2nd jsp?
I don't know ... I am using Tomcat and the J2EE1.4 Application Server I used the "deploytool" to make a WAR file. I tried to ape the example "FormBasedAuthenication" from the J2EE 1.4 Tutorial to create my own formbased logon screen. The example in the Sun tutorial displays the logged on user's username like so ...

Does this mean my jsp should look like this?

Thanks for the reply!
[ February 18, 2004: Message edited by: Sheldon Plankton ]

Bear Bibeault

Sheriff

Posts: 67754

173

I like...

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

The getParameter family of methods do not work with multi-part form data.

[Asking smart questions] [About Bear] [Books by Bear]

HTML 5 (verified skill)
Skill verified by Jeanne Boyarsky

CSS 3 (verified skill)
Skill verified by Jeanne Boyarsky

JavaScript (verified skill)
Skill verified by Jeanne Boyarsky

Sheldon Plankton

Ranch Hand

Posts: 33

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Hi Bear,
Thanks for the reply. Are you saying that I need to change ...

... to ...

...? If make this change will I still be able to upload files?
Thanks!
[ February 18, 2004: Message edited by: Sheldon Plankton ]
[ February 18, 2004: Message edited by: Sheldon Plankton ]
[ February 18, 2004: Message edited by: Sheldon Plankton ]

Bear Bibeault

Sheriff

Posts: 67754

173

I like...

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

If make this change will I still be able to upload files?

No. Basically, uploading files and using getParameter are incompatible. To upload a file you need to use a multi-part form, which precludes the use of getParameter. You need to parse the input yourself or use a third party package (like com.oreilly.servlet) that does it for you.

[Asking smart questions] [About Bear] [Books by Bear]

Sheldon Plankton

Ranch Hand

Posts: 33

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Ah man!
have you ever used Jakarta's FileUpLoad? I guess that's what I'll try next.
Thanks for the info. You jut saved me a lot of wasted time and fustration.

Bear Bibeault

Sheriff

Posts: 67754

173

I like...

posted 21 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

The 'cos' package is the only one I've personally used. This topic has come up before, so I'd suggest searching this (and the Servlets) forum for more info.

[Asking smart questions] [About Bear] [Books by Bear]

Don't get me started about those stupid light bulbs.