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jakarta-poi-manual-3.1-0.0.2mdv2010.0.noarch.rpm

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<h1>POI Text Extraction</h1>
</div>
<div class="h3">
  
  
  
    
<div class="h3">
<h3>Overview</h3>
</div>
      
<p>POI provides text extraction for all the supported file
       formats. In addition, it provides access to the metadata
       associated with a given file, such as title and author.</p>
      
<p>In addition to providing direct text extraction classes,
       POI works closely with the 
       <a href="http://incubator.apache.org/tika/">Apache Tika</a>
       text extraction library. Users may wish to simply utilise 
       the functionality provided by Tika.</p>
    

    
<div class="h3">
<h3>Common functionality</h3>
</div>
     
<p>All of the POI text extractors extend from
      <em>org.apache.poi.POITextExtractor</em>. This provides a common
      method across all extractors, getText(). For many cases, the text
      returned will be all you need. However, many extractors do provide
      more targetted text extraction methods, so you may wish to use
      these in some cases.</p>
     
<p>All POIFS / OLE 2 based text extractors also extend from
      <em>org.apache.poi.POIOLE2TextExtractor</em>. This additionally
      provides common methods to get at the <a href="hpfs/">HPFS
      document metadata</a>.</p>
     
<p>All OOXML based text extractors (available in POI 3.5 and later) 
      also extend from
      <em>org.apache.poi.POIOOXMLTextExtractor</em>. This additionally
      provides common methods to get at the OOXML metadata.</p>
    

    
<div class="h3">
<h3>Text Extractor Factory - POI 3.5 or later</h3>
</div>
     
<p>A new class in POI 3.5, 
      <em>org.apache.poi.extractor.ExtractorFactory</em> provides a
      similar function to WorkbookFactory. You simply pass it an
      InputStream, a file, a POIFSFileSystem or a OOXML Package. It
      figures out the correct text extractor for you, and returns it.</p>
    

    
<div class="h3">
<h3>Excel</h3>
</div>
     
<p>For .xls files, there is 
      <em>org.apache.poi.hssf.extractor.ExcelExtractor</em>, which will 
      return text, optionally with formulas instead of their contents. 
      Those using POI 3.5 can also use 
      <em>org.apache.poi.xssf.extractor.XSSFExcelExtractor</em>, to perform
      a similar task for .xlsx files.</p>
     
<p>In addition, there is a second text extractor for .xls files,
      <em>org.apache.poi.hssf.extractor.EventBasedExcelExtractor</em>. This
      is based on the streaming EventUserModel code, and will generally
      deliver a lower memory footprint for extraction. However, it will
      have problems correctly outputting more complex formulas, as it 
      works with records as they pass, and so doesn't have access to all
      parts of complex and shared formulas.</p>
    

    
<div class="h3">
<h3>Word</h3>
</div>
     
<p>For .doc files, in scratchpad there is 
      <em>org.apache.poi.hwpf.extractor.WordExtractor</em>, which will 
      return text for your document. Those using POI 3.5 can also use 
      <em>org.apache.poi.xwpf.extractor.XPFFWordExtractor</em>, to perform
      a similar task for .docx files.</p>
    

    
<div class="h3">
<h3>PowerPoint</h3>
</div>
     
<p>For .ppt files, in scratchpad there is 
      <em>org.apache.poi.hslf.extractor.PowerPointExtractor</em>, which 
      will return text for your slideshow, optionally restricted to just
      slides text or notes text. Those using POI 3.5 can also use 
      <em>org.apache.poi.xslf.extractor.XSLFPowerPointExtractor</em>, to 
      perform a similar task for .pptx files.</p>
    

    
<div class="h3">
<h3>Visio</h3>
</div>
     
<p>For .vsd files, in scratchpad there is 
      <em>org.apache.poi.hdgf.extractor.VisioTextExtractor</em>, which 
      will return text for your file.</p>
    
  

  

<div id="authors" align="right">by&nbsp;Nick Burch</div>
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