From bc9f6a12a3bd068f1b9f781539c41d8d86b7e409 Mon Sep 17 00:00:00 2001 From: ulrich <not disclosed> Date: Thu, 28 Dec 2017 16:21:19 +0000 Subject: [PATCH] Generischen Filtermechanismus zur Veraenderung von Server-Antworten hinzugefuegt. --- src/de/uhilger/wbx/web/TNServlet.java | 81 ++++++++++++++++++++++++++++++++++++---- 1 files changed, 73 insertions(+), 8 deletions(-) diff --git a/src/de/uhilger/wbx/web/TNServlet.java b/src/de/uhilger/wbx/web/TNServlet.java index 198bced..e86adb4 100644 --- a/src/de/uhilger/wbx/web/TNServlet.java +++ b/src/de/uhilger/wbx/web/TNServlet.java @@ -17,7 +17,17 @@ */ package de.uhilger.wbx.web; +import de.uhilger.wbx.Bild; +import java.awt.Container; +import java.awt.Image; +import java.awt.MediaTracker; +import java.awt.Toolkit; +import java.io.File; import java.io.IOException; +import java.io.UnsupportedEncodingException; +import java.net.URLDecoder; +import java.util.logging.Level; +import java.util.logging.Logger; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @@ -28,14 +38,22 @@ * Miniaturansicht erzeugt werden, wie sie im Dateimanager * der WebBox verwendet wird. * + * Unterstuetzt werden die Varianten + * 120 (_tn), 240 (_kl), 500 (_dd), 700 (_mt), 1200 (_gr) */ public class TNServlet extends DefaultServlet { + + private static final Logger logger = Logger.getLogger(TNServlet.class.getName()); /** * Diese String-Konstanten noetigenfalls in eine * Konfigurationsdatei auslagern */ public static final String TN = "_tn"; + public static final String KL = "_kl"; + public static final String SM = "_sm"; + public static final String MT = "_mt"; + public static final String GR = "_gr"; public static final String JPG = ".jpg"; public static final String JPEG = ".jpeg"; public static final String PNG = ".png"; @@ -52,17 +70,64 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { - String urlStr = request.getRequestURI(); - if(urlStr.contains(TN) && (urlStr.endsWith(JPG) || urlStr.endsWith(JPEG) || urlStr.endsWith(PNG))) { - /* - TODO: hier mit Hilfe der Klasse Bild eine Miniaturansicht erzeugen - und in die Antwort schreiben - */ + String uriStr = request.getRequestURI(); + String relname = uriStr.substring(request.getContextPath().length()); + + // --- Logausgabe Start + File logurifile = new File(uriStr); + String loguriStr = uriStr.substring(request.getContextPath().length()); + File logdir = new File(request.getServletContext().getRealPath("/")); + File logimgfile = new File(logdir, loguriStr); + StringBuffer buf = new StringBuffer(); + buf.append("contextPath: "); + buf.append(request.getContextPath()); + buf.append("\n"); + buf.append("realpath of /: "); + buf.append(request.getServletContext().getRealPath("/")); + buf.append("\n"); + buf.append("urifile: "); + buf.append(logurifile.getAbsolutePath()); + buf.append("\n"); + buf.append("imgfile: "); + buf.append(logimgfile.getAbsolutePath()); + logger.fine(buf.toString()); + // --- Logausgabe Ende + + if(uriStr.endsWith(JPG) || uriStr.endsWith(JPEG) || uriStr.endsWith(PNG)) { + if(uriStr.contains(TN)) { + bildAusgeben(request, response, relname, TN, Bild.WINZIG); + } else if(uriStr.contains(KL)) { + bildAusgeben(request, response, relname, KL, Bild.KLEIN); + } else if(uriStr.contains(SM)) { + bildAusgeben(request, response, relname, SM, Bild.SEMI); + } else if(uriStr.contains(MT)) { + bildAusgeben(request, response, relname, MT, Bild.MITTEL); + } else if(uriStr.contains(GR)) { + bildAusgeben(request, response, relname, GR, Bild.GROSS); + } else { + super.doGet(request, response); + } } else { super.doGet(request, response); } - - } + private void bildAusgeben(HttpServletRequest request, HttpServletResponse response, String relname, String indicator, int bildTyp) throws UnsupportedEncodingException, IOException { + File dir = new File(request.getServletContext().getRealPath("/")); + relname = relname.replace(indicator, ""); + File imgfile = new File(dir, URLDecoder.decode(relname, "utf-8")); + Image image = Toolkit.getDefaultToolkit().getImage(imgfile.getAbsolutePath()); + MediaTracker mediaTracker = new MediaTracker(new Container()); + mediaTracker.addImage(image, 0); + try { + mediaTracker.waitForID(0); + + if (!mediaTracker.isErrorAny()) { + Bild bild = new Bild(); + bild.writeImageStream(image, bild.getVariantenGroesse(bildTyp), bild.getMimeType(imgfile), response.getOutputStream()); + } + } catch (InterruptedException ex) { + logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex); + } + } } -- Gitblit v1.9.3