Java tutorial
// $HeadURL$ /*---------------------------------------------------------------------------- This file is part of deegree, http://deegree.org/ Copyright (C) 2001-2009 by: Department of Geography, University of Bonn and lat/lon GmbH This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Contact information: lat/lon GmbH Aennchenstr. 19, 53177 Bonn Germany http://lat-lon.de/ Department of Geography, University of Bonn Prof. Dr. Klaus Greve Postfach 1147, 53001 Bonn Germany http://www.geographie.uni-bonn.de/deegree/ e-mail: info@deegree.org ----------------------------------------------------------------------------*/ package org.deegree.framework.util; import static org.deegree.enterprise.WebUtils.enableProxyUsage; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import javax.imageio.ImageIO; import javax.media.jai.JAI; import javax.media.jai.PlanarImage; import javax.media.jai.RenderedOp; import org.apache.batik.ext.awt.image.codec.ImageDecoderImpl; import org.apache.batik.ext.awt.image.codec.PNGDecodeParam; import org.apache.batik.ext.awt.image.codec.PNGImageDecoder; import org.apache.batik.ext.awt.image.codec.tiff.TIFFDecodeParam; import org.apache.batik.ext.awt.image.codec.tiff.TIFFImage; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.methods.GetMethod; //import Acme.JPM.Encoders.GifEncoder; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; import com.sun.media.jai.codec.BMPEncodeParam; import com.sun.media.jai.codec.ImageCodec; import com.sun.media.jai.codec.MemoryCacheSeekableStream; import com.sun.media.jai.codec.PNGEncodeParam; import com.sun.media.jai.codec.SeekableStream; import com.sun.media.jai.codec.TIFFEncodeParam; /** * Some utility methods for reading standard images * * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a> * @author last edited by: $Author$ * * @version $Revision$, $Date$ */ public class ImageUtils { /** * reads an image from the passed <tt>URL</tt> using JAI mechanism * * @param url * address of the image * * @return read image * * @throws IOException */ public static BufferedImage loadImage(URL url) throws IOException { if (url.toExternalForm().startsWith("file")) { return loadImage(url.openStream()); } String uri = url.toExternalForm(); HttpClient httpclient = new HttpClient(); enableProxyUsage(httpclient, url); httpclient.getHttpConnectionManager().getParams().setSoTimeout(25000); GetMethod httpget = new GetMethod(uri); httpclient.executeMethod(httpget); return loadImage(httpget.getResponseBodyAsStream()); } /** * reads an image from the passed <tt>InputStream</tt> using JAI mechanism * * @param is * * @return read image * * @throws IOException */ public static BufferedImage loadImage(InputStream is) throws IOException { SeekableStream fss = new MemoryCacheSeekableStream(is); RenderedOp ro = JAI.create("stream", fss); BufferedImage img = ro.getAsBufferedImage(); fss.close(); is.close(); return img; } /** * reads an image from the passed file location using JAI mechanism * * @param fileName * * @return read imagey * * @throws IOException */ public static BufferedImage loadImage(String fileName) throws IOException { return loadImage(new File(fileName)); } /** * reads an image from the passed file location using JAI mechanism * * @param file * * @return read image * * @throws IOException */ public static BufferedImage loadImage(File file) throws IOException { BufferedImage img = null; String tmp = file.getName().toLowerCase(); if (tmp.endsWith(".tif") || tmp.endsWith(".tiff")) { InputStream is = file.toURL().openStream(); org.apache.batik.ext.awt.image.codec.SeekableStream fss = new org.apache.batik.ext.awt.image.codec.MemoryCacheSeekableStream( is); TIFFImage tiff = new TIFFImage(fss, new TIFFDecodeParam(), 0); img = PlanarImage.wrapRenderedImage(tiff).getAsBufferedImage(); fss.close(); } else if (tmp.endsWith(".png")) { InputStream is = file.toURL().openStream(); ImageDecoderImpl dec = new PNGImageDecoder(is, new PNGDecodeParam()); img = PlanarImage.wrapRenderedImage(dec.decodeAsRenderedImage()).getAsBufferedImage(); is.close(); } else { img = ImageIO.read(file); } return img; } /** * stores the passed image in the passed file name with defined quality * * @param image * @param fileName * @param quality * just supported for jpeg (0..1) * @throws IOException */ public static void saveImage(BufferedImage image, String fileName, float quality) throws IOException { File file = new File(fileName); saveImage(image, file, quality); } /** * stores the passed image in the passed file with defined quality * * @param image * @param file * @param quality * just supported for jpeg (0..1) * @throws IOException */ public static void saveImage(BufferedImage image, File file, float quality) throws IOException { int pos = file.getName().lastIndexOf('.'); String ext = file.getName().substring(pos + 1, file.getName().length()).toLowerCase(); FileOutputStream fos = new FileOutputStream(file); saveImage(image, fos, ext, quality); } /** * write an image into the passed output stream. after writing the image the stream will be closed. * * @param image * @param os * @param format * @param quality * @throws IOException */ public static void saveImage(BufferedImage image, OutputStream os, String format, float quality) throws IOException { try { if ("jpeg".equalsIgnoreCase(format) || "jpg".equalsIgnoreCase(format)) { encodeJpeg(os, image, quality); } else if ("tif".equalsIgnoreCase(format) || "tiff".equalsIgnoreCase(format)) { encodeTiff(os, image); } else if ("png".equalsIgnoreCase(format)) { encodePng(os, image); } else if ("gif".equalsIgnoreCase(format)) { encodeGif(os, image); } else if ("bmp".equalsIgnoreCase(format)) { encodeBmp(os, image); } else { throw new IOException("invalid image format: " + format); } } catch (IOException e) { throw e; } finally { os.flush(); os.close(); } } /** * * * @param out * @param img * * @throws IOException */ public static void encodeGif(OutputStream out, BufferedImage img) throws IOException { ImageIO.write(img, "gif", out); // GifEncoder encoder = new GifEncoder( img, out ); // encoder.encode(); } /** * * * @param out * @param img * * @throws IOException */ private static void encodeBmp(OutputStream out, BufferedImage img) throws IOException { BMPEncodeParam encodeParam = new BMPEncodeParam(); com.sun.media.jai.codec.ImageEncoder encoder = ImageCodec.createImageEncoder("BMP", out, encodeParam); encoder.encode(img); } /** * * * @param out * @param img * * @throws IOException */ private static void encodePng(OutputStream out, BufferedImage img) throws IOException { PNGEncodeParam encodeParam = PNGEncodeParam.getDefaultEncodeParam(img); if (encodeParam instanceof PNGEncodeParam.Palette) { PNGEncodeParam.Palette p = (PNGEncodeParam.Palette) encodeParam; byte[] b = new byte[] { -127 }; p.setPaletteTransparency(b); } com.sun.media.jai.codec.ImageEncoder encoder = ImageCodec.createImageEncoder("PNG", out, encodeParam); encoder.encode(img.getData(), img.getColorModel()); } /** * * * @param out * @param img * * @throws IOException */ private static void encodeTiff(OutputStream out, BufferedImage img) throws IOException { TIFFEncodeParam encodeParam = new TIFFEncodeParam(); com.sun.media.jai.codec.ImageEncoder encoder = ImageCodec.createImageEncoder("TIFF", out, encodeParam); encoder.encode(img); } /** * * * @param out * @param img * @param quality * * @throws IOException */ private static void encodeJpeg(OutputStream out, BufferedImage img, float quality) throws IOException { // encode JPEG JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); com.sun.image.codec.jpeg.JPEGEncodeParam jpegParams = encoder.getDefaultJPEGEncodeParam(img); jpegParams.setQuality(quality, false); encoder.setJPEGEncodeParam(jpegParams); encoder.encode(img); } }