Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/filter/NoCacheFilter.java @ 4528:cbd0fafcb26b
Documentation.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 15 Nov 2012 14:23:03 +0100 |
parents | cc6323401643 |
children | 8af500d62098 |
rev | line source |
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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 : |