ANTAL Margit. Sapientia - EMTE, Pannon Forrás,,Egységes erdélyi felnőttképzés a

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1 Sapientia - EMTE, Pannon Forrás,,Egységes erdélyi felnőttképzés a Kárpát-medencei hálózatban 2010

2 Eseménykezelők Szűrők

3 Eseménykezelő típusok javax.servlet.servletrequestlistener javax.servlet.servletrequestattributelistener javax.servlet.http.httpsessionlistener javax.servlet.http.httpsessionattributelistener javax.servlet.http.httpsessionactivationlistener javax.servlet.servletcontextlistener javax.servlet.servletcontextattributelistener

4 A webalkalmazás figyelője Az alkalmazás betöltése: void contextinitialized(servletcontextevent sce) Az alkalmazás megsemmisítése void contextdestroyed(servletcontextevent sce)

5 Distedu alkalmazás módosítása 1 Az alkalmazás betöltésekor olvassa be a tanfolyamok.txt tartalmát. (eddig a ListCourses init metódusa végezte) 2 Az alkalmazás megsemmisítésekor frissítse a tanfolyamok.txt tartalmát.

6 Munkamentek számlálása public class SessionCounterListener implements HttpSessionListener{ private static int sessioncounter = 0; public void sessioncreated(httpsessionevent arg0){ sessioncounter++; public void sessiondestroyed(httpsessionevent arg0){ sessioncounter--; public static int getsessionnumber(){ return sessioncounter;

7 Figyelő konfigurálása <listener> <description> HttpSessionListener </description> <listener-class> listeners.sessioncounterlistener </listener-class> </listener>

8 Szálbiztos figyelő public class SessionCounterListener implements HttpSessionListener{ private static int sessioncounter = 0; public void sessioncreated(httpsessionevent arg0){ synchronized( this ){ sessioncounter++; public void sessiondestroyed(httpsessionevent arg0){ synchronized( this ){ sessioncounter--;

9 Szűrővel végezhető tevékenységek jogosultságellenőrzés szervletek hatékonyságának mérése és naplózása a válasz tömörítése lokalizáció

10 Kérésfeldolgozás szűrővel

11 Kérésfeldolgozás szűrővel

12 Kérés paramétereinek naplózása public void dofilter( ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { Logger log = Logger.getLogger("Request parameters:"); Enumeration parameters = request.getparameternames(); while( parameters.hasmoreelements()){ String p = (String)parameters.nextElement(); log.info(p+": "); String[] ps = request.getparametervalues(p); for( int i=0; i<ps.length; ++i ) log.info("\t"+ps[i]); chain.dofilter( request,response);

13 Szűrő konfigurálása <filter> <filter-name>logfilter</filter-name> <filter-class>logrequestparametersfilter</filter-class> </filter> <filter-mapping> <filter-name>logfilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

14 Szűrők leképzése Szervlet-leképzés <filter-mapping> <filter-name>perffilter</filter-name> <servlet-name>frontcontroller</servlet-name> </filter-mapping> URL-leképzés <filter-mapping> <filter-name>perffilter</filter-name> <url-pattern>/*.do</url-pattern> </filter-mapping>

15 PerformanceFilter szűrő public void dofilter(servletrequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { long begin = System.currentTimeMillis(); chain.dofilter(request, response); long end = System.currentTimeMillis(); filterconfig.getservletcontext().log( "Ellapsed time: "+(end-begin)+" ms");

16 A PerformanceFilter szűrő konfigurálása <filter> <filter-name>performancefilter</filter-name> <filter-class> filters.performancefilter </filter-class> </filter> <filter-mapping> <filter-name>performancefilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

17 Szűrő konfigurálás - feladat <servlet-mapping> <servlet-name>frontcontroller</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <filter-mapping> <filter-name>perffilter</filter-name> <servlet-name>frontcontroller</servlet-name> </filter-mapping> <filter-mapping> <filter-name>auditfilter</filter-name> <url-pattern>*.do</url-patern> </filter-mapping> <filter-mapping> <filter-name>transfilter</filter-name> <url-pattern>*.do</url-patern> </filter-mapping>

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