What is Apache POI?

Apache POI is an open source library of the Apache Software Foundation. POI provides APIs for Java programs to read and write files in Microsoft Office formats.

The main reading and writing Microsoft Office functions provided in POI are as follows:

HSSF -- Provides the function of reading and writing Microsoft Excel format files.

XSSF -- Provides the function of reading and writing Microsoft Excel OOXML format files.

HWPF -- Provides the function of reading and writing files in Microsoft Word format.

HSLF -- Provides the function of reading and writing Microsoft PowerPoint format files.

HDGF -- Provides the function of reading and writing files in Microsoft Visio format.

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