参考手册必须大于多少个字多少个字字字多少个20字多少个20字多少个20字(POIDocument This holds the common functionality for all POI Document classes.
POIOLE2TextExtractor Common Parent for OLE2 based Text Extractors of POI Documents, such as .doc, .xls You will typically find the implementation of a given format's text extractor under org.apache.poi.[format].extractor .
POITextExtractor Common Parent for Text Extractors of POI Documents.
POIXMLDocument　
POIXMLDocumentPart Represents an entry of a OOXML package.
POIXMLFactory Defines a factory API that enables sub-classes to create instances of POIXMLDocumentPart
POIXMLProperties Wrapper around the two different kinds of OOXML properties a document can have
POIXMLPropertiesTextExtractor A POITextExtractor for returning the textual content of the OOXML file properties, eg author and title.
POIXMLRelation Represents a descr iptor of a OOXML relation.)