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some more details on the faq

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git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352690 13f79535-47bb-0310-9956-ffa450edef68
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Avik Sengupta 2002-06-12 17:43:17 +00:00
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src/documentation/xdocs/faq.xml
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@ -114,15 +114,38 @@ public static boolean isCellDateFormatted(HSSFCell cell) {
</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>