目前POI的最新發布版本是3.10_FINAL.該版本保護的jar包有：

Maven artifactIdPrerequisitesJAR

poi	commons-logging, commons-codec, log4j	poi-version-yyyymmdd.jar
poi-scratchpad	poi	poi-scratchpad-version-yyyymmdd.jar
poi-ooxml	poi, poi-ooxml-schemas	poi-ooxml-version-yyyymmdd.jar
poi-ooxml-schemas	xmlbeans	poi-ooxml-schemas-version-yyyymmdd.jar
poi-examples	poi, poi-scratchpad, poi-ooxml	poi-examples-version-yyyymmdd.jar
ooxml-schemas	xmlbeans	ooxml-schemas-1.1.jar

很多人都困惑POI那么多Jar到底應該導入哪一個。

實際上很多時候我們只利用POI來操作Excel。甚至只用xls這一種格式。

那么就沒有必要全部都導入了。具體應該使用哪個JAR包請參考以下內容：

Component Map

The Apache POI distribution consists of support for many document file formats. This support is provided in several Jar files. Not all of the Jars are needed for every format. The following tables show the relationships between POI components, Maven repository tags, and the project's Jar files.

ComponentApplication typeMaven artifactIdNotes

POIFS	OLE2 Filesystem	poi	Required to work with OLE2 / POIFS based files
HPSF	OLE2 Property Sets	poi	?
HSSF	Excel XLS	poi	For HSSF only, if common SS is needed see below
HSLF	PowerPoint PPT	poi-scratchpad	?
HWPF	Word DOC	poi-scratchpad	?
HDGF	Visio VSD	poi-scratchpad	?
HPBF	Publisher PUB	poi-scratchpad	?
HSMF	Outlook MSG	poi-scratchpad	?
OpenXML4J	OOXML	poi-ooxml plus one of poi-ooxml-schemas, ooxml-schemas	Only one schemas jar is needed, see below for differences
XSSF	Excel XLSX	poi-ooxml	?
XSLF	PowerPoint PPTX	poi-ooxml	?
XWPF	Word DOCX	poi-ooxml	?
Common SS	Excel XLS and XLSX	poi-ooxml	WorkbookFactory and friends all require poi-ooxml, not just core poi

當我們只要使用xls格式時、只要導入poi-version-yyyymmdd.jar就可以了。
當我們還要使用xlsx格式、還要導入poi-ooxml-version-yyyymmdd.jar。
至于poi-ooxml-schemas-version-yyyymmdd.jar這個jar基本不太會用到的。
當我們需要操作word、ppt、viso、outlook等時需要用到poi-scratchpad-version-yyyymmdd.jar。

總結

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