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Natural Language Processing with Java

Natural Language Processing with Java

By : Richard M. Reese
2 (3)
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Natural Language Processing with Java

Natural Language Processing with Java

2 (3)
By: Richard M. Reese

Overview of this book

Natural Language Processing (NLP) allows you to take any sentence and identify patterns, special names, company names, and more. The second edition of Natural Language Processing with Java teaches you how to perform language analysis with the help of Java libraries, while constantly gaining insights from the outcomes. You’ll start by understanding how NLP and its various concepts work. Having got to grips with the basics, you’ll explore important tools and libraries in Java for NLP, such as CoreNLP, OpenNLP, Neuroph, and Mallet. You’ll then start performing NLP on different inputs and tasks, such as tokenization, model training, parts-of-speech and parsing trees. You’ll learn about statistical machine translation, summarization, dialog systems, complex searches, supervised and unsupervised NLP, and more. By the end of this book, you’ll have learned more about NLP, neural networks, and various other trained models in Java for enhancing the performance of NLP applications.
Table of Contents (14 chapters)
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Using PDFBox to extract text from PDF documents


The Apache PDFBox (http://pdfbox.apache.org/) project is an API for processing PDF documents. It supports the extraction of text and other tasks, such as document merging, form filling, and PDF creation. We will only illustrate the text extraction process. To demonstrate the use of POI, we will use a file called TestDocument.pdf. This file was saved as a PDF document using the TestDocument.docx file, as shown in the Using POI to extract text from Word documents section. The process is straightforward. A File object is created for the PDF document. The PDDocument class represents the document and the PDFTextStripper class performs the actual text extraction using the getText method, as shown here:

File file = new File(getResourcePath());
PDDocument pd = PDDocument.load(file);
PDFTextStripper stripper = new PDFTextStripper();
String text= stripper.getText(pd);
System.out.println(text);

The output is as follows:

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