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annotate flys-client/src/main/java/de/intevation/flys/client/server/filter/NoCacheFilter.java @ 4483:cc6323401643

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Cosmetics: Removed some WSP, obsolete imports. Documentation added.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 13 Nov 2012 16:52:01 +0100
parents 687b7a6f09aa
children 8af500d62098
rev   line source
4423
687b7a6f09aa Move GGInAFilter and NoCacheFilter to an own package
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1 package de.intevation.flys.client.server.filter;
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2
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3 import java.io.IOException;
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4 import java.util.Date;
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5
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6 import javax.servlet.Filter;
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7 import javax.servlet.FilterChain;
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8 import javax.servlet.FilterConfig;
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9 import javax.servlet.ServletException;
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10 import javax.servlet.ServletRequest;
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11 import javax.servlet.ServletResponse;
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12
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13 import javax.servlet.http.HttpServletRequest;
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14 import javax.servlet.http.HttpServletResponse;
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15
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16 import org.apache.log4j.Logger;
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17
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18 /** ServletFilter to avoid caching for GWTs *.nocache.* files. */
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19 public class NoCacheFilter implements Filter {
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20
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21 private static final long DAY = 86400000L;
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22
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23 private static final String NO_CACHE = ".nocache.";
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24
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25 private static Logger log = Logger.getLogger(NoCacheFilter.class);
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26
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27 /**
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28 * Initialize.
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29 */
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30 @Override
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31 public void init(FilterConfig config)
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32 throws ServletException
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33 {
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34 }
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35
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36
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37 /**
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38 * Called when filter in chain invoked.
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39 * @param req request to servlet
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40 * @param resp response of servlet
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41 * @param chain the filter chain
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42 */
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43 @Override
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44 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
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45 throws IOException, ServletException
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46 {
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47 HttpServletRequest httpreq = (HttpServletRequest)req;
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48 String uri = httpreq.getRequestURI();
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49
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50 if (uri.contains(NO_CACHE)) {
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51 log.debug("Set no-cache for " + uri);
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52
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53 Date now = new Date();
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54 HttpServletResponse httpresp = (HttpServletResponse)resp;
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55 httpresp.setDateHeader("Date", now.getTime());
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56 httpresp.setDateHeader("Expires", now.getTime() - DAY);
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57 httpresp.setHeader("Pragma", "no-cache");
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58 httpresp.setHeader("Cache-control",
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59 "no-cache, no-store, must-revalidate");
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60 }
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61
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62 chain.doFilter(req, resp);
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63 }
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64
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65
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66 /**
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67 * Do nothing at destruction.
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68 */
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69 @Override
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70 public void destroy() {
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org