Clear the Browser cache while Outputting PDFs

Question

Hi,
I am using Servlet to output a PDF (Streams), i am facing Browser cache problem in IE
since i am setting Content type to PDF as follows...
response.setContentType("application/pdf")
i could not able to use follwoing Clear the Browser Cache
response.setHeader("pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);
the above code is not working fine in Netscape but not in IE.
Can any one help me out in this.
Regards
SAM

Answer 1

Hi,
I have a problem with pdf file also, everything working fine in IE and
netscape, but when I tried the streaming of pDF document from my
servlet in response to a request from Opera browser it failed.
the url may give some idea,
http://localhost:8080/pdf/pdfdownload?PDF_FILE=abc.pdf
here pdfdownload is my servlet, and code I used to stream like following
public service(HttpServletRequest req,HttpServletResponse)
ServletContext sc=getServletContext();
String mimeType=sc.getMimeType((String)
req.getParameter("PDF_FILE"));
res.setContentType(mimeType);
File pdf=new File((String)req.getParameter("PDF_FILE"));
res.setContentLength((int)pdf.length());
InputStream in=new FileInputStream(pdf);
OutputStream os=res.getoutputStream();
byte[] buf=new byte[1024];
int count=0;
while(in.available>0)
count=in.read(buf);
os.write(buf,0,count);
the detailed code kept out for simplicity, but the idea is pretty
much is this.
Now, opera opening the stream for a file name pdfdownload and
storing locally and then opening my acrobat reader, the second
time if called it trying to create another file by name
pdfdownload (1)? xxxx where ? is an unknown character, this is
where it's failing, unable to create the file so failing to open
the pdf file. what best process would be to follow in servlet so
the streaming works in all browser, I have seen many link in sun
sites, opening up pdf but it seems they all are stream, and my
opera can identify their size and file name distinctly and saving
them accordingly, any solution ???
thanks
Jishu