[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now

x
?
Solved

Set filename for binary data in HttpServletResponse

Posted on 1998-10-02
11
Medium Priority
?
1,532 Views
Last Modified: 2012-06-22
I have a servlet that retrieves binary data files from a database.  I can send the file to the client with no problems.  I use req.getOutputStream().  How do I set the initial filename that the user sees in the Save As dialog?
0
Comment
Question by:GregL
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
11 Comments
 
LVL 8

Expert Comment

by:diakov
ID: 1225302
Won't this help?
//
saveFileDialog1 = new java.awt.FileDialog(this);
saveFileDialog1.setMode(FileDialog.SAVE);
saveFileDialog1.setTitle("Save");
saveFileDialog1.setFile("initial.file");
0
 
LVL 1

Author Comment

by:GregL
ID: 1225303
Sorry diakov,  I am looking for a way for the servlet to set the filename the client sees.  There is no client-side java..

Thanks,

GregL
0
 
LVL 8

Expert Comment

by:diakov
ID: 1225304
So you generate the HTML dynamically. Isn't there a field in the HTML response header that says this?

Cheers,
  Nik.
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 1

Author Comment

by:GregL
ID: 1225305
I have tried
res.setContentType( contentType + "; filename=" + fileName );

and

res.setHeader( "filename" , fileName );

Neither works..
0
 
LVL 4

Expert Comment

by:seguret
ID: 1225306
Your file will be accessed through an URL.
If you write
<a href="myServlet/toto.hqx">download the file</a>
your user will be asked to save the file "toto.hqx".


0
 
LVL 1

Author Comment

by:GregL
ID: 1225307
Sorry segurets.. I am sending the data back to client in response to a form POST.  Your answer assumes I am using a GET.  This is not a simple link to a file, it is a database transaction that packages the data and sends it back to the client.  I must return the data using a binary stream.

Thanks,

GregL
0
 
LVL 8

Expert Comment

by:diakov
ID: 1225308
Hi again,

try setContentType("application/filename.ext") with some mime type specifications like.

Cheers,
  Nik.
0
 
LVL 1

Author Comment

by:GregL
ID: 1225309
I tried diakov's suggestion.  No luck..  Here is a snippet of my code that may help..
Hashtable h = (Hashtable)o;
String contentType = (String)h.get( "mime_type" );
String fileName = (String)h.get( "file_name" );
byte [] content = (byte [])h.get( "content" );
if( (contentType != null) && (fileName != null) && (content != null) )
{
    res.setContentType( contentType );
    res.setContentLength( content.length );
    res.setHeader( "pragma", "no-cache" );
    OutputStream out = res.getOutputStream();
    out.write( content, 0, content.length );
    out.close();
}
else
{
    res.setContentType( "text/html" );
    PrintWriter out = res.getWriter();
    out.print( "The hashtable was not valid!" );
    out.close();
}

0
 

Expert Comment

by:frank123
ID: 1225310
seguret's answer is basicly right.  Try

<form action="myServlet/toto.hqx" method=post>

0
 
LVL 1

Author Comment

by:GregL
ID: 1225311
Sorry, I found the real answer..

res.setHeader( "Content-Disposition","attachment; filename=" + fileName + ";" );

Thanks, for the help..

Greg L.
0
 
LVL 7

Accepted Solution

by:
linda101698 earned 800 total points
ID: 1225312
I am posting the solution found by GregL so it can be saved in the previously asked questions.  Please see your customer service question for an explanation.

Linda Gardner
Customer Service @ Experts Exchange

Comment From: GregL
                        Date: Tuesday, October 06 1998 - 07:56AM PDT
    I found the real answer..

     res.setHeader( "Content-Disposition","attachment; filename=" + fileName +
     ";" );

     Thanks, for the help..

     Greg L.
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
Suggested Courses

650 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question