API to write huge excel files using java

Question

I am looking to write to an excel (.xls MS Excel 2003 format) file programatically using Java. The excel output files may contain ~200,000 rows which I plan to split over n

Answer 1

We developed a java library for this purpose and currently it is available as open source project https://github.com/jbaliuka/x4j-analytic . We use it for operational reporting. We generate huge Excel files, ~200,000 should work without problems, Excel manages to open such files too. Our code uses POI to load template but generated content is streamed directly to file without XML or Object model layer in memory.