avik 2002/06/12 10:43:17
Modified: src/documentation/xdocs faq.xml
Log:
some more details on the faq
Revision Changes Path
1.11 +30 -7 jakarta-poi/src/documentation/xdocs/faq.xml
Index: faq.xml
===================================================================
RCS file: /home/cvs/jakarta-poi/src/documentation/xdocs/faq.xml,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- faq.xml 12 Jun 2002 08:09:27 -0000 1.10
+++ faq.xml 12 Jun 2002 17:43:17 -0000 1.11
@@ -114,15 +114,38 @@
</question>
<answer>
<p>
- Dont depend on IE to show you an attachment properly if you stream it
via a
- servlet. Every minor version of IE has different bugs.
+ The problem usually manifests itself as the junk characters being shown
on
+ screen. The problem persists even though you have set the correct mime
type.
</p>
<p>
- To guarantee it to work, instead of doing a server-side redirect
- (requestdispather), try doing a client side redirect to your xls file.
Thats
- guaranteed to work ... (also keep in mind that *sometimes* IE makes TWO
- requests for a document that is opened by an external handler .. so if
your xls
- production is heavy, you might have a problem.)
+ The short answer is, dont depend on IE to display a binary file type
you an attachment properly if you stream it via a
+ servlet. Every minor version of IE has different bugs on this issue.
+ </p>
+ <p>
+ The problem in most versions of IE is that it does not use the mime
type on
+ the HTTP response to determine the file type; rather it uses the file
extension
+ on the request. Thus you might want to add a <strong>.xls</strong> to
your request
+ string. For example http://yourserver.com/myServelet.xls?param1=xx.
Sometimes
+ a request like
http://yourserver.com/myServelet?param1=xx&dummy=file.xls is also
+ known to work.
+ </p>
+ <p>
+ To guarantee opening the file properly in Excel from IE, write out your
file to a
+ temporary file under your web root from your servelet. Then send an
http response
+ to the browser to do a client side redirection to your temp file. (If
you do a
+ server side redirect using RequestDispatcher, you will have to add .xls
to the
+ request as mentioned above.)
+ </p>
+ <p>
+ Note also that sometimes when you request a document that is opened
with an
+ external handler, IE sometimes makes two requests to the webserver. So
if your
+ generating process is heavy, it makes sense to write out to a temporary
file, so that multiple
+ requests happen for a static file.
+ </p>
+ <p>
+ None of this is particular to Excel. The same problem arises when you
try to
+ generate any binary file dynamically to an IE client. For example, if
you generate
+ pdf files using <link href="http://xml.apache.org/fop";>FOP</link>, you
will come across many of the same issues.
</p>
<!-- Thanks to Avik for the answer -->
</answer>
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