SCIE - Spinal Cord Injury Ontology Extraction
Copyright (C) 2013, 2014
Raphael Dickfelder, Jan Göpfert, Benjamin Paaßen, Andreas Stöckel
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
This software builds upon Apache PDFBox and has the purpose to extract structured text from a PDF file. By structured we mean that not only the text is extracted but also some information about the document structure, namely:
This indicated an HTML like hierarchical structure that is extracted by this software.
If you want to use the PDF text extractor just for conversion from PDF to .txt it is recommended to just download the .jar file and use its GUI. You need Java 1.7 or higher for that. No further installation is required.
If you want to use its Java API with maven you should either use the binary and install it locally with the command
mvn install:install-file -Dfile=PDFTextExtractor-1.0.jar -DgroupId=de.unibi.techfak.scie -DartifactId=PDFTextExtractor -Dversion=1.0 -Dpackaging=jar
or you can directly compile it from the source using the command
mvn install
Note that maven has to be installed in both cases. Afterwards the PDFTextExtractor will be installed in your local maven repository and you can declare it as dependency using maven. If you do not want to use maven you can directly use the .jar.
If you want to build the sources yourself for independent use with the GUI you should comment out the following lines from the pom.xml:
<exclude>org.apache.pdfbox:pdfbox</exclude> <exclude>org.apache.pdfbox:fontbox</exclude> <exclude>org.apache.pdfbox:jempbox</exclude> <exclude>commons-logging:commons-logging</exclude>
and then apply the command
mvn package
If you do not want to use maven you can use the binary directly.
To test the PDFTextExtractor you should just install Java 1.7 or higher, download the binary jar and start it by double clicking or the command:
java -jar PDFTextExtractor-1.0.1.jar
You can set the PDF files that shall be converted to .txt in a GUI then.
To use the java API is fairly simple. You need the following code to extract structured text from a PDF file:
try{
final FileInputStream input = new FileInputStream(file);
final PDFStructuredTextExtractor ext = new PDFStructuredTextExtractor(input);
final Document doc = ext.doImport();
} catch(IOException ex){
//handle Exception
}
The Document then contains the forementioned hierarchy of Pages, TextBlocks, Paragraphs and Text-objects we mentioned before. They are fairly straightforward to use. If you want further documentation you can look in the code or the JavaDoc.
One specialty is the toString conversion. If you want to use the string begins and ends of each object in the hierarchy, you have to call
doc.indexedToString(0)
at least once. Also an XML conversion is available using the toXML-method.
Most of the PDF handling is done by Apache PDFBox. It in turn depends on the Apache commons logging library. Both are used here according to the Apache License Version 2.0.
Version 3, 19 November 2007
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