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Apache POI is a Java library for reading and writing Microsoft Office binary and OOXML file formats. This article covers the necessary Maven dependencies, a summary of its components, and practical code examples for creating Excel workbooks. Maven Dependencies Include the following dependencies for Excel (XLS and XLSX), Word, PowerPoint, Visio, ...

Core Abstractions and Format Distinctions Apache POI models spreadsheet documents through four hierarchical interfaces: Workbook (the complete file), Sheet (individual tabs), Row, and Cell. When targeting legacy binary specifications (.xls), the HSSF engine is utilized. For contemporary XML-based workbooks (.xlsx), the XSSF model applies. A cri ...