Very helpful! Thank you.
Erik
Daniel Perry wrote:
They effect browser behaviour.
cache-control - used by browsers and proxies to determine wether to cache
the document or not, and if so, for how long.
content-length - not sure if struts would do this for you, but i know there
are issues with some browsers not liking binary data that it doesnt know the
length of. Especially applies to pdfs.
Content-disposition - this is *very* usefull. You can specify inline or
attachment. Inline tells the browser to display the file in the browser.
(eg. the normal default behaviour for pdfs). Attachment tells the browser
that the file is to be downloaded rather than viewed, so the browser should
show the 'save file' dialog box. Using filename=... with this allows you to
specify a filename for the attachment. So, if you have an action
download.do?id=6, it can say filename is tradereport-march-2004.pdf! Very
useful for reports, etc where you would otherwise have many files with the
same 'default' filename, ie report.pdf/whatever the browser decides. Can be
used to reduce admin cockups!!!
Daniel.
-----Original Message-----
From: Erik Weber [mailto:[EMAIL PROTECTED]
Sent: 25 August 2004 16:14
To: Struts Users Mailing List
Subject: Re: download binary content
The difference between your implementation and mine is that I am not
setting the Cache-Control, Content-Disposition and Content-Length
headers. My download action seems to work fine in IE and Mozilla, but,
could you enlighten me on what I may be sacrificing?
Thanks,
Erik
Daniel Perry wrote:
Below is some code i wrote to do this. is some code i wrote:
Note the doc object is specific to my app it has methods for
returning the
content type, filename, and a File object pointing to the
document on disk.
I have used almost identicle code for outputting pdf data. I
think you can
use "attachment" rather than "inline" to make the browser save the file
rather than view it.
Daniel.
// set response headers
response.setHeader("Cache-Control", "max-age=600");
response.setContentType(doc.getContentType());
//Send content to Browser
StringBuffer cd = new StringBuffer();
cd.append("inline");
cd.append("; filename=");
cd.append(doc.getFilename());
response.setHeader("Content-disposition", cd.toString());
response.setContentLength((int) doc.getFile().length());
// send data
ServletOutputStream sos;
sos = response.getOutputStream();
InputStream is = new BufferedInputStream(new
FileInputStream(doc.getFile()));
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = is.read(buffer, 0, 8192)) != -1) {
sos.write(buffer, 0, bytesRead);
}
sos.flush();
is.close();
// return null so it just outputs data (no forward!)
return null;
-----Original Message-----
From: Stefan Groschupf [mailto:[EMAIL PROTECTED]
Sent: 25 August 2004 14:46
To: Struts Users Mailing List
Subject: download binary content
Hi,
can someone point me to a resource that describe how to realize a
dowanload action?
Do I can write to the response object with out forwarding?
Thanks for any hints.
Stefan
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