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/* |
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WebBox - Dein Server. |
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Copyright (C) 2017 Ulrich Hilger, http://uhilger.de |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Affero General Public License as |
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published by the Free Software Foundation, either version 3 of the |
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License, or (at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Affero General Public License for more details. |
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You should have received a copy of the GNU Affero General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package de.uhilger.wbx.web; |
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import de.uhilger.wbx.Bild; |
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import java.awt.Container; |
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import java.awt.Image; |
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import java.awt.MediaTracker; |
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import java.awt.Toolkit; |
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import java.io.File; |
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import java.io.IOException; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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import javax.servlet.ServletException; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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import org.apache.catalina.servlets.DefaultServlet; |
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/** |
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* Mit dem TNServlet kann für eine Bilddatei eine |
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* Miniaturansicht erzeugt werden, wie sie im Dateimanager |
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* der WebBox verwendet wird. |
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* |
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*/ |
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public class TNServlet extends DefaultServlet { |
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private static final Logger logger = Logger.getLogger(TNServlet.class.getName()); |
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/** |
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* Diese String-Konstanten noetigenfalls in eine |
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* Konfigurationsdatei auslagern |
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*/ |
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public static final String TN = "_tn"; |
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public static final String JPG = ".jpg"; |
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public static final String JPEG = ".jpeg"; |
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public static final String PNG = ".png"; |
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/** |
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* Handles the HTTP <code>GET</code> method. |
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* |
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* @param request servlet request |
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* @param response servlet response |
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* @throws ServletException if a servlet-specific error occurs |
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* @throws IOException if an I/O error occurs |
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*/ |
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@Override |
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protected void doGet(HttpServletRequest request, HttpServletResponse response) |
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throws ServletException, IOException { |
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String uriStr = request.getRequestURI(); |
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String relname = uriStr.substring(request.getContextPath().length()); |
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/* |
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File urifile = new File(uriStr); |
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uriStr = uriStr.substring(request.getContextPath().length()); |
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File dir = new File(request.getServletContext().getRealPath("/")); |
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File imgfile = new File(dir, uriStr); |
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StringBuffer buf = new StringBuffer(); |
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buf.append("contextPath: "); |
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buf.append(request.getContextPath()); |
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buf.append("\n"); |
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buf.append("realpath of /: "); |
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buf.append(request.getServletContext().getRealPath("/")); |
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buf.append("\n"); |
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buf.append("urifile: "); |
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buf.append(urifile.getAbsolutePath()); |
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buf.append("\n"); |
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buf.append("imgfile: "); |
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buf.append(imgfile.getAbsolutePath()); |
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logger.fine(buf.toString()); |
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*/ |
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if(uriStr.contains(TN) && (uriStr.endsWith(JPG) || uriStr.endsWith(JPEG) || uriStr.endsWith(PNG))) { |
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/* |
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TODO: hier mit Hilfe der Klasse Bild eine Miniaturansicht erzeugen |
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und in die Antwort schreiben |
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*/ |
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File dir = new File(request.getServletContext().getRealPath("/")); |
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relname = relname.replace(TN, ""); |
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File imgfile = new File(dir, relname); |
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Image image = Toolkit.getDefaultToolkit().getImage(imgfile.getAbsolutePath()); |
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MediaTracker mediaTracker = new MediaTracker(new Container()); |
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mediaTracker.addImage(image, 0); |
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try { |
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mediaTracker.waitForID(0); |
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if (!mediaTracker.isErrorAny()) { |
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Bild bild = new Bild(); |
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bild.writeImageStream(image, bild.getVariantenGroesse(Bild.WINZIG), bild.getMimeType(imgfile), response.getOutputStream()); |
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} |
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} catch (InterruptedException ex) { |
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logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex); |
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} |
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} else { |
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super.doGet(request, response); |
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} |
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} |
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} |