File download using jsp

Question

I am trying to download a file from the server using jsp but it always shows the file in the browser.I want a Save/Open dialog box to allow the user to save this file in the local system. any feedback is welcome.
thanks in advance
vinod

Answer 1

Basically out frame work is in struts.........
In struts for file down load I wrote the code as
String fileName = <file name>;
String filePath = <file path>;
String fileType = fileName.substring(dotIndex+1,fileName.length());
ServletOutputStream out = httpservletresponse.getOutputStream();
if (fileType.trim().equalsIgnoreCase("doc"))
httpservletresponse.setContentType( "application/msword" );
else if (fileType.trim().equalsIgnoreCase("xls"))
httpservletresponse.setContentType( "application/vnd.ms-excel" );
else if (fileType.trim().equalsIgnoreCase("pdf"))
httpservletresponse.setContentType( "application/pdf" );
else if (fileType.trim().equalsIgnoreCase("ppt"))
httpservletresponse.setContentType( "application/ppt" );
else
httpservletresponse.setContentType( "application/octet-stream" );
httpservletresponse.setHeader("Content-disposition", "attachment; filename=" +actualName );
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(filePath));
BufferedOutputStream bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
while(-1 != (bytesRead = bis.read(buff, 0, buff.length)))
bos.write(buff, 0, bytesRead);
I hav written this in seperate function which returns boolean true If this works correctly otherwise fase.
If it is 'true ' I am forwarding it to 'success.jsp' else'fail.jsp'....................
Now problem is It is not forwarding to any other pages and giving error as "Illegal state .can not forward.Response already committed."
I think this error is coming becos of 'response.setHeader()' and using out object.........
Please give me any solution for this problem.........Since I am strucked here.It is urgent for me to do...................................
I don't mind If u giv any alteernative code for this..............
Thanx in advance..................
Plz. respond quickly...................