Java tutorial
/** * Copyright (c) 2001-2012 "Redbasin Networks, INC" [http://redbasin.org] * * This file is part of Redbasin OpenDocShare community project. * * Redbasin OpenDocShare 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 * (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, see <http://www.gnu.org/licenses/>. */ package util; import util.WebUtil; import util.GlobalConst; import util.ExpiringObjectPool; import model.Photo; import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.awt.Dimension; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * image magic includes */ import magick.ImageInfo; import magick.MagickImage; import magick.MagickException; /** * * @author Smitha Gudur (smitha@redbasinnetworks.com) * @version $Revision: 1.1 $ */ public class StreamBlobUtil { /** Logger for this class and subclasses */ protected static final Log logger = LogFactory.getLog("util.StreamBlobUtil"); protected ExpiringObjectPool eop; private volatile ImageInfo info = null; private volatile MagickImage image = null; protected ImgUtil imageHelper = new ImgJaiTool(); static { System.setProperty("com.sun.media.jai.disableMediaLib", "true"); } /** * Returns scaled blob * @param b byte stream * @return scaled byte stream */ /* public synchronized byte[] streamBlob(byte[] b) throws BasicObjException { if (b == null) { return null; } try { System.setProperty("jmagick.systemclassloader", "no"); ImageInfo info = new ImageInfo(); if (info != null) { MagickImage image = new MagickImage(info, b); if (image != null) { Dimension d = image.getDimension(); d = WebUtil.getDimension(d, GlobalConst.pWidth, GlobalConst.pHeight); if (d != null) { MagickImage scaled = image.scaleImg((int)d.getWidth(), (int)d.getHeight()); if (scaled != null) { return (scaled.imageToBlob(info)); } } } } } catch (Exception e) { throw new BasicObjException("Error writing image stream ", e); } return null; } */ /** * Returns scaled blob * @param b byte stream * @param width width of the image * @param height height of the image * @param scale boolean yes or no * @return scaled byte stream */ public synchronized byte[] newStreamBlob(byte[] b, int width, int height, boolean doIScale) throws BasicObjException { logger.info("entered 1 streamBlob"); if (b == null) { return null; } logger.info("entered 2 streamBlob"); try { initializeImageInfo(); logger.info("completed new ImageInfo()"); if (info != null) { logger.info("info != null"); //MagickImage image = new MagickImage(info, b); logger.info("completed new MagickImage() in streamBlob"); if (image != null) { image.blobToImage(info, b); MagickImage scaled = null; if (doIScale) { // scale the image Dimension d = image.getDimension(); logger.info("completed new getDimension() in streamBlob"); d = WebUtil.getDimension(d, width, height); logger.info("completed getDimension() in streamBlob"); if (d != null) { scaled = image.scaleImage((int) d.getWidth(), (int) d.getHeight()); } } else { // don't scale the image scaled = image.scaleImage(width, height); } if (scaled != null) { logger.info("completing 4 streamBlob"); return (scaled.imageToBlob(info)); } } } } catch (Exception e) { throw new BasicObjException("Error writing image stream ", e); } logger.info("returning null in streamBlob"); return null; } public synchronized byte[] streamBlob(byte[] img, int scaledWidth, int scaledHeight, boolean doIScale) throws BasicObjException { //some parameters String type = "jpeg"; int quality = 90; //jai operations ImgMetadata data = null; ImgMetadata scaled = null; try { if (img == null) { throw new BasicObjException("Byte array img[] passed to streamBlob is null"); } data = imageHelper.makeImg(img); scaled = imageHelper.scaleImg(data, scaledWidth, scaledHeight); } catch (Exception e) { throw new BasicObjException("Some JAI scaling error occurred.", e); } ByteArrayOutputStream os = new ByteArrayOutputStream(); scaled.writeTo(os, type, quality); //calls JAI.create("encode", result, fos, type, null); return os.toByteArray(); } public HttpServletResponse setHeader(HttpServletResponse response, Photo photo, String btitle) { if (photo == null || response == null) { return response; } int maxAge = 2592000; response.setContentType(photo.getValue(DbConstants.MIMETYPE)); response.setHeader("Content-Disposition", "attachment; filename=" + btitle); response.setHeader("Cache-Control", "max-age=" + maxAge); response.setHeader("Accept-Ranges", "bytes"); response.setHeader("Connection", "Keep-Alive"); response.setHeader("Keep-Alive", "timeout=15, max=100"); return response; } public Photo setPhoto(Photo photo, byte[] blob) { if (photo == null || blob == null) { return null; } Photo sPhoto = (Photo) eop.newObject(DbConstants.PHOTO); sPhoto.setValue(DbConstants.MIMETYPE, photo.getValue(DbConstants.MIMETYPE)); sPhoto.setValue(DbConstants.BTITLE, photo.getValue(DbConstants.BTITLE)); sPhoto.setBlob(blob); return sPhoto; } public synchronized void initializeImageInfo() throws BasicObjException { logger.info("entered initializeImageInfo"); System.setProperty("jmagick.systemclassloader", "no"); try { if (info == null) { logger.info("allocate new ImageInfo()"); info = new ImageInfo(); logger.info("completed allocating new ImageInfo()"); } if (image == null) { logger.info("allocating new MagickImage()"); image = new MagickImage(); logger.info("completed allocating new MagickImage()"); } } catch (Exception e) { throw new BasicObjException("Error creating new ImageInfo()", e); } logger.info("completed initializeImageInfo"); } /** * This method is called by spring. * @param eop */ public void setEop(ExpiringObjectPool eop) { this.eop = eop; } }