Java tutorial
/* * Copyright 2008 by Kevin Day. * * The contents of this file are subject to the Mozilla Public License Version 1.1 * (the "License"); you may not use this file except in compliance with the License. * You may obtain a copy of the License at http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the License. * * The Original Code is 'iText, a free JAVA-PDF library'. * * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by * the Initial Developer are Copyright (C) 1999-2008 by Bruno Lowagie. * All Rights Reserved. * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer * are Copyright (C) 2000-2008 by Paulo Soares. All Rights Reserved. * * Contributor(s): all the names of the contributors are added in the source code * where applicable. * * Alternatively, the contents of this file may be used under the terms of the * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the * provisions of LGPL are applicable instead of those above. If you wish to * allow use of your version of this file only under the terms of the LGPL * License and not to allow others to use your version of this file under * the MPL, indicate your decision by deleting the provisions above and * replace them with the notice and other provisions required by the LGPL. * If you do not delete the provisions above, a recipient may use your version * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE. * * This library is free software; you can redistribute it and/or modify it * under the terms of the MPL as stated above or under the terms of the GNU * Library General Public License as published by the Free Software Foundation; * either version 2 of the License, or any later version. * * This library 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 Library general Public License for more * details. * * If you didn't download this code from the following link, you should check if * you aren't using an obsolete version: * http://www.lowagie.com/iText/ */ package com.lowagie.text.pdf.parser; import java.io.IOException; import com.lowagie.text.pdf.PdfDictionary; import com.lowagie.text.pdf.PdfName; import com.lowagie.text.pdf.PdfReader; import com.lowagie.text.pdf.RandomAccessFileOrArray; /** * Extracts text from a PDF file. * @since 2.1.4 */ public class PdfTextExtractor { /** The PdfReader that holds the PDF file. */ private final PdfReader reader; /** The processor that will extract the text. */ private final SimpleTextExtractingPdfContentStreamProcessor extractionProcessor; /** * Creates a new Text Extractor object. * @param reader the reader with the PDF */ public PdfTextExtractor(PdfReader reader) { this.reader = reader; extractionProcessor = new SimpleTextExtractingPdfContentStreamProcessor(); } /** * Gets the content stream of a page. * @param pageNum the page number of page you want get the content stream from * @return a byte array with the content stream of a page * @throws IOException */ private byte[] getContentBytesForPage(int pageNum) throws IOException { RandomAccessFileOrArray f = reader.getSafeFile(); byte[] contentBytes = reader.getPageContent(pageNum, f); f.close(); return contentBytes; } /** * Gets the text from a page. * @param page the page number of the page * @return a String with the content as plain text (without PDF syntax) * @throws IOException */ public String getTextFromPage(int page) throws IOException { PdfDictionary pageDic = reader.getPageN(page); PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES); extractionProcessor.processContent(getContentBytesForPage(page), resourcesDic); return extractionProcessor.getResultantText(); } }