Append rows to an existing Excel sheet with Apache POI 5.5.1. We find the next free row, keep the date and number formats, add rows before a totals row and save through a temp file so a failed write never empties the spreadsheet.
Read large Excel files with the Apache POI SAX parser and XSSFSheetXMLHandler, handle missing cells and dates, import in batches, write with SXSSF.
Learn to read and write Excel files in Java with Apache POI 5.5.1, from the Maven dependency to styles, formulas, dates and DataFormatter. Also covers SXSSF and the event API for large files, and the fixes for common POI errors.
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