When a servlet context is initialized or destroyed, the ___________ interface is used.
- ServletContextAttributeEvent
- ServletContextAttributeListener
- ServletContextEvent
- ServletContextListener
The ServletContextListener interface is used when a servlet context is initialized or destroyed, providing methods for handling these lifecycle events.
When a new attribute is added to the session, which listener interfaces are invoked?
- HttpSessionActivationListener
- HttpSessionAttributeListener
- HttpSessionBindingListener
- HttpSessionEvent
The HttpSessionAttributeListener interface is invoked when a new attribute is added to the session. This allows you to perform actions when attributes are added, removed, or replaced in a session.
Identify the listener interface that would be used to log session creation and destruction.
- HttpSessionActivationListener
- HttpSessionBindingListener
- HttpSessionEvent
- HttpSessionListener
The HttpSessionListener interface is used to log session creation and destruction events. This allows you to perform actions when sessions are created or destroyed in a web application.
In a web application, you need to audit changes to session attributes. Which listener would you implement?
- HttpSessionAttributeListener
- HttpSessionBindingListener
- HttpSessionEvent
- HttpSessionListener
The HttpSessionAttributeListener interface is used to audit changes to session attributes. This allows you to perform actions when attributes are added, removed, or replaced in a session.
What is the purpose of the FilterConfig object in Servlet filters?
- To define filter order.
- To hold configuration parameters for a filter.
- To process HTTP requests.
- To store filter mappings.
The FilterConfig object is used to hold configuration parameters for a filter, allowing the filter to be customized without modifying the filter code itself.
How do you specify the URL patterns to which a filter should apply?
- By modifying the servlet code.
- In the filter's constructor.
- In the web server settings.
- Using the
URL patterns to which a filter should apply are specified using the element inside the element in the web.xml file. This defines the URLs that the filter will intercept.
How can a filter access initialization parameters set in the web.xml file?
- By using the FilterConfig object
- By using the HttpResponse object
- By using the HttpServletRequest object
- By using the ServletContext object
A filter can access initialization parameters set in the web.xml file by using the FilterConfig object. This object provides methods to retrieve initialization parameters.
What is the function of FilterMapping in a web application?
- To define the order of filter execution
- To map URL patterns to filter classes
- To map filter classes to servlets
- To specify filter initialization parameters
The function of FilterMapping is to map URL patterns to filter classes. This mapping determines which requests should be intercepted and processed by the associated filter.
The method attributeAdded belongs to the interface _________.
- HttpSessionAttributeListener
- HttpSessionListener
- ServletContextListener
- ServletRequestListener
The correct answer is HttpSessionAttributeListener. The attributeAdded method is part of this interface, which is used to receive notifications about the addition of attributes to a session.
How do filters interact with different types of servlets and JSP pages?
- Filters are applied only to static resources
- Filters can be applied to both servlets and JSP pages
- Filters can only be applied to servlets
- Filters cannot be applied to JSP pages
Filters can be applied to both servlets and JSP pages, providing a versatile mechanism for preprocessing and postprocessing of requests and responses in different types of web components.