Java tutorial
/** * ========================================================================================== * = JAHIA'S DUAL LICENSING - IMPORTANT INFORMATION = * ========================================================================================== * * Copyright (C) 2002-2015 Jahia Solutions Group SA. All rights reserved. * * THIS FILE IS AVAILABLE UNDER TWO DIFFERENT LICENSES: * 1/GPL OR 2/JSEL * * 1/ GPL * ====================================================================================== * * IF YOU DECIDE TO CHOSE THE GPL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS: * * "This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * As a special exception to the terms and conditions of version 2.0 of * the GPL (or any later version), you may redistribute this Program in connection * with Free/Libre and Open Source Software ("FLOSS") applications as described * in Jahia's FLOSS exception. You should have received a copy of the text * describing the FLOSS exception, also available here: * http://www.jahia.com/license" * * 2/ JSEL - Commercial and Supported Versions of the program * ====================================================================================== * * IF YOU DECIDE TO CHOOSE THE JSEL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS: * * Alternatively, commercial and supported versions of the program - also known as * Enterprise Distributions - must be used in accordance with the terms and conditions * contained in a separate written agreement between you and Jahia Solutions Group SA. * * If you are unsure which license is appropriate for your use, * please contact the sales department at sales@jahia.com. * * * ========================================================================================== * = ABOUT JAHIA = * ========================================================================================== * * Rooted in Open Source CMS, Jahias Digital Industrialization paradigm is about * streamlining Enterprise digital projects across channels to truly control * time-to-market and TCO, project after project. * Putting an end to the Tunnel effect?, the Jahia Studio enables IT and * marketing teams to collaboratively and iteratively build cutting-edge * online business solutions. * These, in turn, are securely and easily deployed as modules and apps, * reusable across any digital projects, thanks to the Jahia Private App Store Software. * Each solution provided by Jahia stems from this overarching vision: * Digital Factory, Workspace Factory, Portal Factory and eCommerce Factory. * Founded in 2002 and headquartered in Geneva, Switzerland, * Jahia Solutions Group has its North American headquarters in Washington DC, * with offices in Chicago, Toronto and throughout Europe. * Jahia counts hundreds of global brands and governmental organizations * among its loyal customers, in more than 20 countries across the globe. * * For more information, please visit http://www.jahia.com */ package org.jahia.modules.dm.thumbnails.impl; import java.awt.image.BufferedImage; import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import org.apache.commons.io.IOUtils; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.jahia.dm.DocumentOperationException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Creates images for PDF document pages using PDFBox library. * * @author Sergiy Shyrkov */ public class PDFBoxPDF2ImageConverterService extends AbstractPDF2ImageConverterService { private static final Logger logger = LoggerFactory.getLogger(PDFBoxPDF2ImageConverterService.class); private int imageType = BufferedImage.TYPE_INT_RGB; private int resolution = 96; public BufferedImage getImageOfPage(File pdfFile, int pageNumber) throws DocumentOperationException { BufferedImage image = null; long timer = System.currentTimeMillis(); InputStream is = null; try { is = new BufferedInputStream(new FileInputStream(pdfFile)); image = getImageOfPage(is, pageNumber); if (image != null && logger.isDebugEnabled()) { logger.debug("Generated an image for the page {} of the file {} in {} ms", new Object[] { pageNumber, pdfFile, (System.currentTimeMillis() - timer) }); } } catch (FileNotFoundException e) { throw new DocumentOperationException("Error occurred trying to generate an image for the page " + pageNumber + " of the file " + pdfFile, e); } finally { IOUtils.closeQuietly(is); } return image; } public BufferedImage getImageOfPage(InputStream pdfInputStream, int pageNumber) throws DocumentOperationException { BufferedImage image = null; long timer = System.currentTimeMillis(); PDDocument pdfDoc = null; try { pdfDoc = PDDocument.load(pdfInputStream); PDPage page = (PDPage) pdfDoc.getDocumentCatalog().getAllPages().get(pageNumber); image = page.convertToImage(imageType, resolution); if (image != null && logger.isDebugEnabled()) { logger.debug("Generated an image for the page {} of the supplied input stream in {} ms", pageNumber, (System.currentTimeMillis() - timer)); } } catch (IndexOutOfBoundsException e) { logger.warn("No page with the number {} found in the PDF document", pageNumber); } catch (IOException e) { throw new DocumentOperationException("Error occurred trying to generate an image for the page " + pageNumber + " of the supplied input stream", e); } finally { try { pdfDoc.close(); } catch (Exception e) { // ignore } } return image; } public void setImageType(int imageType) { this.imageType = imageType; } public void setResolution(int resolution) { this.resolution = resolution; } }