Java tutorial
/* Copyright (c) 2010-2012 ARTags project owners (see http://www.artags.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 * (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 org.artags.server.web; import org.artags.server.business.Tag; import org.artags.server.business.TagDAO; import org.artags.server.business.TagImage; import org.artags.server.business.TagImageDAO; import org.artags.server.business.TagThumbnail; import org.artags.server.business.TagThumbnailDAO; import com.google.appengine.api.images.Image; import com.google.appengine.api.images.ImagesService; import com.google.appengine.api.images.ImagesServiceFactory; import com.google.appengine.api.images.Transform; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Date; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItemIterator; import org.apache.commons.fileupload.FileItemStream; import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.io.IOUtils; import org.artags.server.service.CacheService; /** * * @author Pierre Levy */ public class TagUploadServlet extends HttpServlet { private static final int THUMBNAIL_MIN = 180; private static final int THUMBNAIL_MAX = 240; @Override public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { try { // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(); upload.setSizeMax(1000000); res.setContentType(Constants.CONTENT_TYPE_TEXT); PrintWriter out = res.getWriter(); byte[] image = null; byte[] thumbnail = null; Tag tag = new Tag(); TagImage tagImage = new TagImage(); TagThumbnail tagThumbnail = new TagThumbnail(); String contentType = null; boolean bLandscape = false; try { FileItemIterator iterator = upload.getItemIterator(req); while (iterator.hasNext()) { FileItemStream item = iterator.next(); InputStream in = item.openStream(); if (item.isFormField()) { if (Constants.PARAMATER_NAME.equals(item.getFieldName())) { String name = IOUtils.toString(in, "UTF-8"); tag.setName(name); } if (Constants.PARAMATER_LAT.equals(item.getFieldName())) { tag.setLat(Double.parseDouble(IOUtils.toString(in))); } if (Constants.PARAMATER_LON.equals(item.getFieldName())) { tag.setLon(Double.parseDouble(IOUtils.toString(in))); } if (Constants.PARAMATER_LANDSCAPE.equals(item.getFieldName())) { bLandscape = IOUtils.toString(in).equals("on"); } } else { String fieldName = item.getFieldName(); String fileName = item.getName(); contentType = item.getContentType(); try { if (fieldName.equals("thumbnail")) { thumbnail = IOUtils.toByteArray(in); } else { image = IOUtils.toByteArray(in); } } finally { IOUtils.closeQuietly(in); } } } } catch (SizeLimitExceededException e) { out.println("You exceeded the maximum size (" + e.getPermittedSize() + ") of the file (" + e.getActualSize() + ")"); } contentType = (contentType != null) ? contentType : "image/jpeg"; if (bLandscape) { image = rotate(image); if (thumbnail != null) { thumbnail = rotate(thumbnail); } } tagImage.setImage(image); tagImage.setContentType(contentType); if (thumbnail != null) { tagThumbnail.setImage(thumbnail); } else { tagThumbnail.setImage(createThumbnail(image)); } tagThumbnail.setContentType(contentType); TagImageDAO daoImage = new TagImageDAO(); daoImage.create(tagImage); TagThumbnailDAO daoThumbnail = new TagThumbnailDAO(); daoThumbnail.create(tagThumbnail); TagDAO dao = new TagDAO(); tag.setKeyImage(tagImage.getKey()); tag.setKeyThumbnail(tagThumbnail.getKey()); tag.setDate(new Date().getTime()); tag.setDateUpdate(new Date().getTime()); Tag newTag = dao.create(tag); out.print("" + newTag.getKey().getId()); out.close(); CacheService.instance().invalidate(); } catch (Exception ex) { throw new ServletException(ex); } } private byte[] createThumbnail(byte[] image) { ImagesService imagesService = ImagesServiceFactory.getImagesService(); Image oldImage = ImagesServiceFactory.makeImage(image); int width = THUMBNAIL_MIN; int height = THUMBNAIL_MAX; if (oldImage.getWidth() > oldImage.getHeight()) { width = THUMBNAIL_MAX; height = THUMBNAIL_MIN; } Transform resize = ImagesServiceFactory.makeResize(width, height); Image newImage = imagesService.applyTransform(resize, oldImage); return newImage.getImageData(); } private byte[] rotate(byte[] image) { ImagesService imagesService = ImagesServiceFactory.getImagesService(); Image oldImage = ImagesServiceFactory.makeImage(image); Transform rotate = ImagesServiceFactory.makeRotate(-90); Image newImage = imagesService.applyTransform(rotate, oldImage); return newImage.getImageData(); } }