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Handling srpeadsheet data programmatically in Java is most efficiently achieved using the Apache POI library. To support both legacy .xls and modern .xlsx formats, include the following Maven dependency in your project configuration: <dependency> <groupId>org.apache.poi</groupId> &...

Export large datasets to XLSX using Apache POI’s SXSSF (streaming) API while automatically sizing columns based on the actual cell content. It also includes a compact styling cookbook to borders, fonts, alignment, wrapping, and merged regions. Export utility (SXSSF) with adaptive column widths The e...