How can you track attribute changes in the HttpSession object?
- Use HttpSessionAttributeListener
- Use HttpSessionBindingListener
- Use HttpSessionEvent
- Use HttpSessionListener
You can track attribute changes in the HttpSession object by implementing the HttpSessionBindingListener interface, which provides methods to be notified when attributes are added, removed, or replaced.
What is the use of HttpSessionBindingListener in the context of servlets?
- To listen for changes in the session attributes
- To listen for changes in the session creation
- To listen for changes in the session destruction
- To listen for changes in the session timeout
The HttpSessionBindingListener is used to listen for changes in the session attributes and is notified when an attribute is added, removed, or replaced in the HttpSession object.
For which purpose is the ServletRequestListener used in servlets?
- To listen for request attribute changes
- To monitor session attribute changes
- To track changes in ServletContext attributes
- To track session creation and destruction
The ServletRequestListener is used in servlets to listen for changes in request attributes.
What is the primary interface for handling HTTP requests in Java servlets?
- HttpResponse
- HttpServlet
- ServletInterface
- ServletRequest
The primary interface for handling HTTP requests in Java servlets is ServletRequest.
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.
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.
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.
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.
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.
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.
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.
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.