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目前POI的最新版本是 3.16-beta2，该版本是测试版本，稳定版本是 3.15，下载地址为 Apache POI （http://poi.apache.org/download.html）。
一、目录结构
目录结构如下：
二、详细介绍
官方地址：https://poi.apache.org/overview.html。
Maven artifactIdPrerequisitesJARNotes
poi-excelant
poi,poi-ooxml
poi-excelant-version.jar
用于读取表格、写入表格等一系列操作表格所用到的包
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
DDF
Escher common drawings
poi
HWMF
WMF drawings
poi-scratchpad
OpenXML4J
OOXML
poi-ooxml plus either poi-ooxml-schemas orooxml-schemas and ooxml-security
See notes below for differences between these options
XSSF
Excel XLSX
poi-ooxml
XSLF
PowerPoint PPTX
poi-ooxml
XWPF
Word DOCX
poi-ooxml
XDGF
Visio VSDX
poi-ooxml
Common SL
PowerPoint PPT and PPTX
poi-scratchpad and poi-ooxml
SL code is in the core POI jar, but implementations are in poi-scratchpad and poi-ooxml.
Common SS
Excel XLS and XLSX
poi-ooxml
WorkbookFactory and friends all require poi-ooxml, not just core poi
This table maps artifacts into the jar file name. "version-yyyymmdd" is the POI version stamp. You can see what the latest stamp is on the downloads page.
Maven artifactIdPrerequisitesJAR
poi
commons-logging, commons-codec, commons-collections, 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-1.3.jar
ooxml-security
xmlbeans For signing: bcpkix-jdk15on, bcprov-jdk15on, xmlsec, slf4j-api
ooxml-security-1.1.jar
Note：Apache commons-collections4 was added as a dependency in POI 3.15 beta 3.
poi-ooxml requires poi-ooxml-schemas. This is a substantially smaller version of the ooxml-schemas jar (ooxml-schemas-1.3.jar for POI 3.14 or later, ooxml-schemas-1.1.jar for POI 3.7 up to POI 3.13, ooxml-schemas-1.0.jar for POI 3.5 and 3.6). The larger ooxml-schemas jar is normally only required for development. Similarly, the ooxml-security jar, which contains all of the classes relating to encryption and signing, is normally only required for development. A subset of its contents are in poi-ooxml-schemas. This JAR is ooxml-security-1.1.jar for POI 3.14 onwards and ooxml-security-1.0.jar prior to that.
The OOXML jars require a stax implementation, but now that Apache POI requires Java 6, that dependency is provided by the JRE and no additional stax jars are required. The OOXML jars used to require DOM4J, but the code has now been changed to use JAXP and no additional dom4j jars are required. By the way, look at this FAQ if you have problems when using a non-Oracle JDK.
The ooxml schemas jars are compiled with Apache XMLBeans 2.3, and so can be used at runtime with any version of XMLBeans from 2.3 or newer. Wherever possible though, we recommend that you use XMLBeans 2.6.0 with Apache POI, and that is the version now shipped in the binary release packages.
总结：按照需要导入jar包及相关依赖jar包。
poi-3.15.jar (excel文件生成需要)
poi-examples-3.15.jar(官方示例，开发不需要)
poi-excelant-3.15.jar(不需要)
poi-ooxml-3.15.jar(excel,word,ppt均需要)
poi-ooxml-schemas-3.15.jar(excel需要)
poi-scratchpad-3.15.jar(ppt,vsd,word,viso,outlook等需要)