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Java servlet - clear cache while Outputting PDFs

3 replies on 1 page. Most recent reply: Jul 24, 2002 1:10 PM by Jay Kandy

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Zvi

Posts: 2
Nickname: steviehols
Registered: Jul, 2002

Java servlet - clear cache while Outputting PDFs

Posted: Jul 23, 2002 9:08 AM

Hi,

I am using a Servlet to output PDF (Streams), i am facing a Browser cache problem in IE

i am setting Content type to PDF as follows...

response.setContentType("application/pdf")

When trying to disable the browser cache using any of the following the pdf file would not open! All I got was an error saying that adobe did not think the file existed!

response.setHeader("pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);

Can any one help me out in this.
Rgds..SH

Jay Kandy

Posts: 77
Nickname: jay
Registered: Mar, 2002

Re: Java servlet - clear cache while Outputting PDFs

Posted: Jul 23, 2002 3:07 PM

IE likes to know the size of the file before it displays anything. Try this:
Create an OutputStream for your PDF content.

ByteArrayOutputStream baos = new ByteArrayOutputStream();

Write all the PDF data to baos. Dont flush() anything yet. Just before you end service() method, use this:

response.setContentLength(baos.size());
ServletOutputStream out = response.getOutputStream();
baos.writeTo(out);
out.flush();

where response is your servlet's HttpServletResponse
Hope that helped,
Jay

Zvi

Posts: 2
Nickname: steviehols
Registered: Jul, 2002

Re: Java servlet - clear cache while Outputting PDFs

Posted: Jul 24, 2002 8:00 AM

Im afraid that did not work - same error.
I think it is to do with ie5.5. but not sure..any other ideas?
cheers..SH

Jay Kandy

Posts: 77
Nickname: jay
Registered: Mar, 2002

Re: Java servlet - clear cache while Outputting PDFs

Posted: Jul 24, 2002 1:10 PM

Hmmmm what could be wrong?
1. Does it work in Netscape or with a FileOutputStream?
2. This is when you really wish for an exception! Post them if you got any.
3. Which library are you using?

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