Java tutorial
/* * eGov SmartCity eGovernance suite aims to improve the internal efficiency,transparency, * accountability and the service delivery of the government organizations. * * Copyright (C) 2017 eGovernments Foundation * * The updated version of eGov suite of products as by eGovernments Foundation * is available at http://www.egovernments.org * * 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 3 of the License, or * 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, see http://www.gnu.org/licenses/ or * http://www.gnu.org/licenses/gpl.html . * * In addition to the terms of the GPL license to be adhered to in using this * program, the following additional terms are to be complied with: * * 1) All versions of this program, verbatim or modified must carry this * Legal Notice. * Further, all user interfaces, including but not limited to citizen facing interfaces, * Urban Local Bodies interfaces, dashboards, mobile applications, of the program and any * derived works should carry eGovernments Foundation logo on the top right corner. * * For the logo, please refer http://egovernments.org/html/logo/egov_logo.png. * For any further queries on attribution, including queries on brand guidelines, * please contact contact@egovernments.org * * 2) Any misrepresentation of the origin of the material is prohibited. It * is required that all modified versions of this material be marked in * reasonable ways as different from the original version. * * 3) This license does not grant any rights to any user of the program * with regards to rights under trademark law for use of the trade names * or trademarks of eGovernments Foundation. * * In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org. * */ package org.egov.infra.utils; import javaxt.io.Image; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.multipart.MultipartFile; import javax.imageio.IIOImage; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.ImageWriteParam; import javax.imageio.ImageWriter; import javax.imageio.stream.ImageInputStream; import javax.imageio.stream.ImageOutputStream; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.nio.file.Paths; import java.util.Iterator; import java.util.Optional; import static javax.imageio.ImageIO.createImageOutputStream; import static javax.imageio.ImageIO.getImageWritersByFormatName; import static javax.imageio.ImageIO.read; import static javax.imageio.ImageWriteParam.MODE_EXPLICIT; import static org.apache.commons.io.FilenameUtils.getExtension; import static org.apache.commons.lang3.StringUtils.EMPTY; import static org.apache.commons.lang3.StringUtils.defaultString; public final class ImageUtils { public static final String JPG_EXTN = ".jpg"; public static final String JPG_FORMAT_NAME = "jpeg"; public static final String PNG_EXTN = ".png"; public static final String PNG_FORMAT_NAME = "png"; public static final String PNG_MIME_TYPE = "image/png"; public static final String JPG_MIME_TYPE = "image/jpeg"; private static final Logger LOG = LoggerFactory.getLogger(ImageUtils.class); private ImageUtils() { //Not to be initialized } public static File compressImage(MultipartFile imageFile) throws IOException { return compressImage(imageFile.getInputStream(), imageFile.getOriginalFilename(), true); } public static File compressImage(final InputStream imageStream, String imageFileName, boolean closeStream) throws IOException { File compressedImage = Paths.get(imageFileName).toFile(); try (final ImageOutputStream imageOutput = createImageOutputStream(compressedImage)) { ImageWriter writer = getImageWritersByFormatName( defaultString(getExtension(imageFileName), JPG_FORMAT_NAME)).next(); writer.setOutput(imageOutput); ImageWriteParam writeParam = writer.getDefaultWriteParam(); if (writeParam.canWriteCompressed()) { writeParam.setCompressionMode(MODE_EXPLICIT); writeParam.setCompressionType(writeParam.getCompressionTypes()[0]); writeParam.setCompressionQuality(0.05F); } writer.write(null, new IIOImage(read(imageStream), null, null), writeParam); writer.dispose(); if (closeStream) imageStream.close(); } return compressedImage; } public static double[] findGeoCoordinates(File jpegImage) { Optional<double[]> coordinates = Optional.empty(); if (JPG_FORMAT_NAME.equalsIgnoreCase(imageFormat(jpegImage))) { Image image = new Image(jpegImage); coordinates = Optional.ofNullable(image.getGPSCoordinate()); } return coordinates.orElse(new double[] { 0D, 0D }); } public static String imageFormat(File image) { try (ImageInputStream iis = ImageIO.createImageInputStream(image)) { Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(iis); return imageReaders.hasNext() ? imageReaders.next().getFormatName() : EMPTY; } catch (IOException e) { LOG.warn("Could not read image format from file", e); return EMPTY; } } }