The Apache POI project (http://poi.apache.org/index.html) is an API used to extract information from Microsoft Office products. It is an extensive library that allows information extraction from Word documents and other office products, such as Excel and Outlook. When downloading the API for POI, you will also need to use XMLBeans (http://xmlbeans.apache.org/), which supports POI. The binaries for XMLBeans can be downloaded from http://www.java2s.com/Code/Jar/x/Downloadxmlbeans524jar.htm. Our interest is in demonstrating how to use POI to extract text from word documents.
To demonstrate this, we will use a file called TestDocument.docx, with some text, tables, and other stuff, as shown in the following screenshot (we have taken the English home page of Wikipedia):
There are several different file formats used by different versions of Word. To simplify the selection of which text extraction class to use, we will use the ExtractorFactory factory class. Although the POI's capabilities are considerable, the process of extracting text is simple. As shown here, a FileInputStream object representing the file, TestDocument.docx, is used by the ExtractorFactory class' createExtractor method to select the appropriate POITextExtractor instance. This is the base class for several different extractors. The getText method is applied to the extractor to get the text:
private static String getResourcePath(){
File currDir = new File(".");
String path = currDir .getAbsolutePath();
path = path.substring(0, path.length()-2);
String resourcePath = path + File.separator + "src/chapter11/TestDocument.docx";
return resourcePath;
}
public static void main(String args[]){
try {
FileInputStream fis = new FileInputStream(getResourcePath());
POITextExtractor textExtractor = ExtractorFactory.createExtractor(fis);
System.out.println(textExtractor.getText());
} catch (FileNotFoundException ex) {
Logger.getLogger(WordDocExtractor.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
System.out.println(ex);
} catch (OpenXML4JException ex) {
System.out.println(ex);
} catch (XmlException ex) {
System.out.println(ex);
}
}
The output is as follows:
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Furthermore, metadata about the document can also be extracted using metaExtractor, as shown in the following code:
POITextExtractor metaExtractor = textExtractor.getMetadataTextExtractor();
System.out.println(metaExtractor.getText());
It will generate the following output:
Created = Thu Jun 28 06:36:00 UTC 2018
CreatedString = 2018-06-28T06:36:00Z
Creator = Ashish
LastModifiedBy = Ashish
LastPrintedString =
Modified = Thu Jun 28 06:37:00 UTC 2018
ModifiedString = 2018-06-28T06:37:00Z
Revision = 1
Application = Microsoft Office Word
AppVersion = 12.0000
Characters = 26588
CharactersWithSpaces = 31190
Company =
HyperlinksChanged = false
Lines = 221
LinksUpToDate = false
Pages = 8
Paragraphs = 62
Template = Normal.dotm
TotalTime = 1
The other approach is to create an instance of the POIXMLPropertiesTextExtractor class using XWPFDocument, which can be used for CoreProperties and ExtendedProperties, as shown in the following code:
fis = new FileInputStream(getResourcePath());
POIXMLPropertiesTextExtractor properties = new POIXMLPropertiesTextExtractor(new XWPFDocument(fis));
CoreProperties coreProperties = properties.getCoreProperties();
System.out.println(properties.getCorePropertiesText());
ExtendedProperties extendedProperties = properties.getExtendedProperties();
System.out.println(properties.getExtendedPropertiesText());
The output is as follows:
Created = Thu Jun 28 06:36:00 UTC 2018
CreatedString = 2018-06-28T06:36:00Z
Creator = Ashish
LastModifiedBy = Ashish
LastPrintedString =
Modified = Thu Jun 28 06:37:00 UTC 2018
ModifiedString = 2018-06-28T06:37:00Z
Revision = 1
Application = Microsoft Office Word
AppVersion = 12.0000
Characters = 26588
CharactersWithSpaces = 31190
Company =
HyperlinksChanged = false
Lines = 221
LinksUpToDate = false
Pages = 8
Paragraphs = 62
Template = Normal.dotm
TotalTime = 1