网博培训servletjavaxfilter接口定义了过滤器生命

回234过滤器是向Web应用程序的请求和响应处理添5过滤器将处理过的过滤器将处理过的用户的请求发送至Web资源用户用户发送资资源将响应发送至过 789Filterpublicvoidinit(FilterConfigfilterConfig)throwsServletExceptionpublicvoiddoFilter(ServletRequestServletResponseresp,FilterChainchain)throwsjava.io.IOException,ServletExceptionpublicvoidFilterConfigpublicStringpublicServletContextpublicStringgetInitParameter(String

publicjava.util.EnumerationFilterChainpublicvoiddoFilter(ServletRequestreq,ServletResponseresp)throwsIOException,ServletException <filter-name>MyFilter</filter-<url-pattern>/servletname/*</url- publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,FilterChainfilterChain){HttpServletRequestfilterChain.doFilter(requestresponse);}ServletContextListener：用于监听WEB应用启动contextDestroyed(ServletContextEventcontextInitialized(ServletContextEventattributeAdded(ServletContextAttributeEventattributeRemoved(ServletContextAttributeEventattributeReplaced(ServletContextAttributeEventHttpSessionListener：监听HttpSession的操作，sessionCreated(HttpSessionEventsessionDestroyed(HttpSessionEventHttpSessionAttributeListener attributeRemoved((HttpSessionBindingEventattributeReplaced((HttpSessionBindingEventvoidvalueBound(HttpSessionBindingEventvoidvalueUnbound(HttpSessionBindingEventsessionDidActivate(HttpSessionEventsessionWillPassivate(HttpSessionEventrequestInitialized(ServletRequestEventrequestDestroyed(ServletRequestEventattributeAdded(ServletRequestAttributeEventattributeRemoved(ServletRequestAttributeEventattributeReplaced(ServletRequestAttributeEventpublicclassOnlinesListenerimplementspublicvoidsessionCreated(HttpSessionEvent{Integercnt=(Integer)hse.getSe