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On Tue, Dec 15, 2020 at 3:34 PM Darren Strong <darren@xxxxxxxxx> wrote:

We've gotten pretty good at generating spreadsheets with POI HSSF and the JNI interface, but, the JNI interface is not efficient and the POI HSSF versions march on while we've frozen our updates due to the move to enums in that tool. Now, IBM has come a long way in helping us generate XML and writing it to the IFS, which Excel is based on. Has anyone had success generating the .xlsx file structure directly as XML files and then zipping it up in the format that Excel likes? Is there some documentation on the web I'm not able to find that might give some detail and examples on this? I would guess that this method would be very fast compared to what we're using now.

What you describe would indeed produce Excel files faster than how
you're doing it now.

However, what you describe sounds like it entails a lot of
re-engineering things that other people have already done. Instead of
spending all your time and effort reinventing the wheel, I strongly
suggest taking a survey of what's already out there and then investing
the time and effort in adopting one of those. I suspect it will (1)
take less time and effort overall, and depending on which route you
take, may ALSO (2) pay dividends beyond just generation of Excel
files.

John Y.

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