poi各個jar的做用分別是什麼？

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目前POI的最新發布版本是3.10_FINAL.該版本保護的jar包有：

Maven artifactId	Prerequisites	JAR
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

不少人都困惑POI那麼多Jar到底應該導入哪個。

實際上不少時候咱們只利用POI來操做Excel。甚至只用xls這一種格式。

那麼就沒有必要所有都導入了。具體應該使用哪一個JAR包請參考如下內容：

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.

Component	Application type	Maven artifactId	Notes
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

當咱們只要使用xls格式時、只要導入poi-version-yyyymmdd.jar就能夠了。

當咱們還要使用xlsx格式、還要導入poi-ooxml-version-yyyymmdd.jar。

至於poi-ooxml-schemas-version-yyyymmdd.jar這個jar基本不太會用到的。

當咱們須要操做word、ppt、viso、outlook等時須要用到poi-scratchpad-version-yyyymmdd.jar。