#What does apache's poi mean?
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 format.
Basic functions
Structure:
HSSF - Provides the function of reading and writing files in Microsoft Excel format.
XSSF - Provides the function of reading and writing files in Microsoft Excel OOXML format.
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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