Is it possible to create and write to a (new) excel file using the event driven API from POI? I’ve found examples on how to read with that API, but not how to write.
Here is one possibility, not very well written, though:
I’m using a modified version of that, which does not require temporary files and is overall more efficient
Yes. Absolutely. Look at POI-XSSF and POI-HSSF
You could use the SXSSF from Apache POI
I’vr worked with SXSSF from Apache POI. It is really good for writing huge files of data since it keeps only a small part of data in memory and flushes the remaining to disk, as opposed to HSSF or XSSF which keep all data in memory till finally writing at once.
But unfortunately, SXSSF is that it is meant only for writing, not for reading.