Book Image

Natural Language Processing with Java Cookbook

By : Richard M. Reese
Book Image

Natural Language Processing with Java Cookbook

By: Richard M. Reese

Overview of this book

Natural Language Processing (NLP) has become one of the prime technologies for processing very large amounts of unstructured data from disparate information sources. This book includes a wide set of recipes and quick methods that solve challenges in text syntax, semantics, and speech tasks. At the beginning of the book, you'll learn important NLP techniques, such as identifying parts of speech, tagging words, and analyzing word semantics. You will learn how to perform lexical analysis and use machine learning techniques to speed up NLP operations. With independent recipes, you will explore techniques for customizing your existing NLP engines/models using Java libraries such as OpenNLP and the Stanford NLP library. You will also learn how to use NLP processing features from cloud-based sources, including Google and Amazon Web Services (AWS). You will master core tasks, such as stemming, lemmatization, part-of-speech tagging, and named entity recognition. You will also learn about sentiment analysis, semantic text similarity, language identification, machine translation, and text summarization. By the end of this book, you will be ready to become a professional NLP expert using a problem-solution approach to analyze any sort of text, sentence, or semantic word.
Table of Contents (14 chapters)

Extracting text from a PDF document

In this recipe, we will learn how to extract text and images from a PDF document. The process of extracting metadata from a PDF document is found in the next recipe: Extracting metadata from a PDF document.

We will use the Apache PDFBox API to illustrate this process. This API is fairly complex. While we will only show how to extract text and images, more detailed information can be extracted. This API provides a series of classes and methods to identify and manipulate the structure and contents of PDF documents. To create a sample PDF document, we will use Microsoft Word. However, there are other ways of creating PDF documents, including PDFBox.

Getting ready

To prepare this recipe, we...