目前POI的最新发布版本是3.10_FINAL.该版本保护的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
很多人都困惑POI那么多Jar到底应该导入哪一个。
实际上很多时候我们只利用POI来操作Excel。甚至只用xls这一种格式。
那么就没有必要全部都导入了。具体应该使用哪个JAR包请参考以下内容：
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当我们只要使用xls格式时、只要导入poi-version-yyyymmdd.jar就可以了。
当我们还要使用xlsx格式、还要导入poi-ooxml-version-yyyymmdd.jar。
至于poi-ooxml-schemas-version-yyyymmdd.jar这个jar基本不太会用到的。
当我们需要操作word、ppt、viso、outlook等时需要用到poi-scratchpad-version-yyyymmdd.jar。
