commit | author | age
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c583a8
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package de.uhilger.wbx.web; |
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import de.uhilger.wbx.web.FeedStreamWriter; |
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import de.vogella.rss.model.Feed; |
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import de.vogella.rss.model.FeedMessage; |
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import java.io.File; |
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import java.io.FileReader; |
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import java.io.IOException; |
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import java.io.Reader; |
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import java.text.SimpleDateFormat; |
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import java.util.ArrayList; |
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import java.util.Calendar; |
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import java.util.Collections; |
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import java.util.Comparator; |
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import java.util.Date; |
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import java.util.GregorianCalendar; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Locale; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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import javax.naming.Context; |
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import javax.naming.InitialContext; |
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import javax.naming.NamingException; |
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import javax.servlet.ServletContext; |
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import javax.servlet.ServletException; |
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import javax.servlet.ServletOutputStream; |
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import javax.servlet.http.HttpServlet; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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/** |
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* Das FeedServlet erstellt Feeds von Ordnern der WebBox |
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* |
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* Eine Maximaltiefe als Parameter soll regeln, wie viele Ordner tief |
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* Dateien gesucht werden |
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* |
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*/ |
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public class FeedServlet extends HttpServlet { |
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private static final Logger logger = Logger.getLogger(FeedServlet.class.getName()); |
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public static final String JNDI_CTX_NAME = "java:comp/env"; |
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public static final String WBX_FILE_BASE = "wbxFileBase"; |
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public static final String WBX_MAX_FEED_DEPTH = "wbxMaxFeedDepth"; |
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public static final String WBX_MAX_FEED_ENTRIES = "wbxMaxFeedEntries"; |
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public static final int WBX_DEF_MAX_FEED_DEPTH = 3; |
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public static final int WBX_DEF_MAX_FEED_ENTRIES = 5; |
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public static final String NOT_FOUND = " nicht gefunden"; |
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public static final String NO_STRING = " ist kein String"; |
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@Override |
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { |
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ServletOutputStream out = response.getOutputStream(); |
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response.setContentType("text/xml"); |
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String url = request.getRequestURL().toString(); |
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logger.fine("requestURL: " + url); |
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String dataUrl = url.replace("feed/", "data/"); |
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logger.fine("dataUrl: " + dataUrl); |
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int pos = dataUrl.indexOf("data/"); |
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String zielPfad = dataUrl.substring(pos); |
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logger.fine(zielPfad); |
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//ServletContext ctx = request.getServletContext(); |
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//Object o = ctx.getAttribute(FILE_BASE); |
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String basis = getJNDIParameter(WBX_FILE_BASE); |
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//if(o instanceof String) { |
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//String basis = o.toString(); |
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logger.fine("basis: " + basis); |
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StringBuffer pfad = new StringBuffer(); |
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pfad.append(basis); |
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pfad.append(zielPfad.replace("data/", "/www/")); |
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logger.fine("pfad: " + pfad); |
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String dirStr = pfad.toString().substring(0, pfad.lastIndexOf("/")); |
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logger.fine("dirStr: " + dirStr); |
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File dir = new File(dirStr); |
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if(dir.isDirectory()) { |
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List beitraege = new ArrayList(); |
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int maxBeitraege = getJNDIInt(WBX_MAX_FEED_ENTRIES, WBX_DEF_MAX_FEED_ENTRIES); |
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int maxTiefe = getJNDIInt(WBX_MAX_FEED_DEPTH, WBX_DEF_MAX_FEED_DEPTH); |
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collectFiles(dir, 0, beitraege, maxTiefe, maxBeitraege); |
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Iterator i = beitraege.iterator(); |
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while(i.hasNext()) { |
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File f = (File) i.next(); |
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logger.fine(f.getAbsolutePath() + " " + f.lastModified()); |
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} |
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writeFeed("Newsfeed", "Neueste Inhalte von Ulrich Hilger", out, beitraege, basis, pfad.toString()); |
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} else { |
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logger.fine(dir.getAbsolutePath() + " ist kein Ordner."); |
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} |
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//} |
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} |
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/** |
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* Diese Methode funktioniert nur, wenn entweder ein Ordner uebergeben |
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* wird, der keine Unterordner enthaelt wie zum Beispiel der Ordner 'neu' |
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* der Bildersammlung oder ein Ordner, dessen Unterordner |
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* nach dem Schema Jahr, Monat benannt sind wie bei einem Journal, das |
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* die Beitraege wie folgt enthaelt: |
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* Journal-Ordner |
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* 2018 |
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* 12 |
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* 11 |
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* 10 |
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* usw. |
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* 2017 |
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* 12 |
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* 11 |
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* 10 |
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* usw. |
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* |
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* @param out |
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* @param dir |
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* @param tiefe |
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* @param dateizaehler |
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*/ |
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private void collectFiles(File dir, int tiefe, List beitraege, int maxTiefe, int maxBeitraege) { |
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List dirs = new ArrayList(); |
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List beitraegeHier = new ArrayList(); |
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File[] files = dir.listFiles(); |
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for(int i = 0; i < files.length; i++) { |
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if(files[i].isDirectory()) { |
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if(tiefe < maxTiefe) { |
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dirs.add(files[i]); |
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} |
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} else { |
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beitraegeHier.add(files[i]); |
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} |
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} |
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if(dirs.size() > 0) { |
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// hier zuvor die Verzeichnissse absteigend nach Name sortieren |
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Collections.sort(dirs, new Comparator<File>() { |
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@Override |
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public int compare(File o1, File o2) { |
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return o2.getName().compareTo(o1.getName()); |
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} |
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}); |
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Iterator i = dirs.iterator(); |
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while(i.hasNext() && beitraege.size() < maxBeitraege) { |
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collectFiles((File) i.next(), tiefe+1, beitraege, maxTiefe, maxBeitraege); |
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} |
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} |
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if(beitraegeHier.size() > 0) { |
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// hier zuvor die Liste der Beitraege dieses Ordners nach lastModified absteigend sortieren |
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// dann die neuesten in beitraege aufnehmen, bis die maximale Zahl gesuchter |
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// neuer Beitraege erreicht ist. |
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Collections.sort(beitraegeHier, new Comparator<File>() { |
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@Override |
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public int compare(File o1, File o2) { |
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int ergebnis; |
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if(o1.lastModified() > o2.lastModified()) { |
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ergebnis = -1; |
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} else if(o2.lastModified() > o1.lastModified()) { |
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ergebnis = 1; |
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} else { |
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ergebnis = 0; |
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} |
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return ergebnis; |
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} |
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}); |
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Iterator i = beitraegeHier.iterator(); |
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while(i.hasNext() && beitraege.size() < maxBeitraege) { |
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File bf = (File) i.next(); |
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String nm = bf.getName().toLowerCase(); |
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if(nm.endsWith(".htmi") || nm.endsWith(".html") || nm.endsWith(".htm") || |
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nm.endsWith(".jpg") || nm.endsWith(".jpeg") || nm.endsWith(".png") || |
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nm.endsWith(".txt")) { |
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beitraege.add(bf); |
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} |
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} |
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} |
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} |
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public void writeFeed(String feedTitel, String beschr, ServletOutputStream s, List beitraege, String basis, String pfad) { |
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String copyright = "Copyright (c) 2018 Ulrich Hilger"; |
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String title = feedTitel; |
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String description = beschr; |
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String language = "de"; |
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String link = "https://www.uhilger.de"; |
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Calendar cal = new GregorianCalendar(); |
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Date creationDate = cal.getTime(); |
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SimpleDateFormat date_format = new SimpleDateFormat( |
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"EEE', 'dd' 'MMM' 'yyyy' 'HH:mm:ss' 'Z", Locale.US); |
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String pubdate = date_format.format(creationDate); |
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Feed rssFeed = new Feed(title, link, description, language, |
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copyright, pubdate); |
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Iterator i = beitraege.iterator(); |
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while (i.hasNext()) { |
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File f = (File) i.next(); |
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FeedMessage feedEintrag = new FeedMessage(); |
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feedEintrag.setTitle(f.getName()); |
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//feedEintrag.setDescription("Beschreibung hier"); |
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feedEintrag.setAuthor("ulrich Punkt hilger bei web Punkt de (Ulrich Hilger)"); |
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String urlStr = f.getAbsolutePath(); |
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urlStr = urlStr.replace(basis, "https://uhilger.de"); |
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urlStr = urlStr.replace("www/", "data/"); |
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logger.fine(urlStr); |
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feedEintrag.setGuid(urlStr); |
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feedEintrag.setLink(urlStr); |
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logger.fine(f.getName()); |
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feedEintrag.setDescription(readFilePart(f, urlStr)); |
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rssFeed.getMessages().add(feedEintrag); |
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} |
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FeedStreamWriter writer = new FeedStreamWriter(rssFeed, s); |
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//RSSFeedWriter writer = new RSSFeedWriter(rssFeed, pfad + "/articles.rss"); |
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//ByteArrayOutputStream bs = new ByteArrayOutputStream(); |
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//RSSByteFeedWriter wr = new RSSByteFeedWriter(rssFeed, bs); |
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try { |
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writer.write(); |
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//s.print(bs.toString()); |
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} catch (Exception e) { |
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logger.log(Level.SEVERE, e.getMessage(), e); |
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} |
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} |
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private String readFilePart(File f, String urlStr) { |
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StringBuffer buf = new StringBuffer(); |
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Reader reader = null; |
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try { |
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String fn = f.getName().toLowerCase(); |
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if(fn.endsWith(".jpg") || fn.endsWith(".jpeg") || fn.endsWith(".png")) { |
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String noExt; |
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String ext; |
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int dotpos = urlStr.lastIndexOf('.'); |
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if(dotpos > -1) { |
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noExt = urlStr.substring(0, dotpos); |
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ext = urlStr.substring(dotpos); |
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} else { |
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noExt = ""; |
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ext = ""; |
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} |
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buf.append("<a href='"); |
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buf.append(urlStr); |
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buf.append("'><img src='"); |
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buf.append(noExt); |
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buf.append("_kl"); |
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buf.append(ext); |
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buf.append("'></a>"); |
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} else { |
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reader = new FileReader(f); |
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char[] readBuffer = new char[1024]; |
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int charsRead = reader.read(readBuffer); |
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buf.append(readBuffer); |
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reader.close(); |
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} |
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return buf.toString(); |
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} catch (Exception ex) { |
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logger.log(Level.SEVERE, null, ex); |
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return buf.toString(); |
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} |
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} |
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private int getJNDIInt(String paramName, int defaultVal) { |
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String jndiStr = getJNDIParameter(paramName); |
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try { |
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return Integer.parseInt(jndiStr); |
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} catch(NumberFormatException ex) { |
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return defaultVal; |
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} |
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} |
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private String getJNDIParameter(String pname) { |
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try { |
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// unseren environment naming context ermitteln |
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Context initCtx = new InitialContext(); |
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Context envCtx = (Context) initCtx.lookup(JNDI_CTX_NAME); |
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// unseren Parameter lesen |
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Object o = envCtx.lookup(pname); |
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if(o instanceof String) { |
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return o.toString(); |
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} else { |
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return NO_STRING; |
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} |
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} catch (NamingException ex) { |
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logger.log(Level.SEVERE, ex.getMessage()); |
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return NOT_FOUND; |
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} |
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} |
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} |