What is ServletContextListener in Java?
ServletContextListener receives the notifications about changes to the servlet context and perform some action. ServletContextListener is used to perform important task at the time when context is initialized and destroyed.
How do you deploy a web application listener within a web application?
You write event listener classes that respond to these changes in state and you configure and deploy Application event and listener classes in a Web Application….To configure an event listener:
- Open the web.
- Add an event declaration using the element.
- Write and deploy the Listener class.
How do you deploy a servlet context listener within a web application?
In this example, we will show you how to create a custom listener class by implementing ServletContextListener , which run your code before the web application is started. 1.1 Create a class and implement the ServletContextListener interface. 1.2 Put it in the deployment descriptor.
Which method of ServletContextListener interface is used to perform startup activities for web application?
javax.servlet Interface ServletContextListener
Method Summary | |
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void | contextDestroyed(ServletContextEvent sce) Receives notification that the ServletContext is about to be shut down. |
void | contextInitialized(ServletContextEvent sce) Receives notification that the web application initialization process is starting. |
Which of the following are the methods defined in ServletContextListener interface *?
There are two methods declared in the ServletContextListener interface which must be implemented by the servlet programmer to perform some action such as creating database connection etc. public void contextInitialized(ServletContextEvent e): is invoked when application is deployed on the server.
Which method of ServletContextListener is invoked when an servlet application is initialized?
When a servlet context is created, the contextInitialized method of your listener class is invoked, which creates the database connection for the servlets in your application to use if this context is for your application.
What are the mechanism available in ServletContextListener interface?
It provides the notification for the initialization process of the web application. All ServletContextListeners are notified of context initialization before any filter or servlet in the web application is initialized.
What are the methods available in ServletContextListener interface Mcq?
Methods of ServletContextListener interface public void contextInitialized(ServletContextEvent e): is invoked when application is deployed on the server. public void contextDestroyed(ServletContextEvent e): is invoked when application is undeployed from the server.
What are the mechanism is available in ServletContextListener interface?
What are the mechanisms available in ServletContextListener interface Mcq?
Answer is “contextInitialized((),contextDestroyed()”
Which of the following code is used to get session in Servlet?
Discussion Forum
Que. | Which of the following code is used to get an attribute in a HTTP Session object in servlets? |
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b. | session.alterAttribute(String name) |
c. | session.updateAttribute(String name) |
d. | session.setAttribute(String name) |
Answer:session.getAttribute(String name) |
Which mechanisms are available in ServletContextListener interface?
What are the mechanisms available in ServletContextListener…
- contextInit(), contextService(), contextDestroyed()
- contextInitialized((),contextDestroyed()
- contextInitialized(), contextService(), contextDestroyed.
- None of the above.
Is servletcontextlistener a servlet or JSP?
Context listener is not a servlet or JSP, it’s a class that implements ServletContextListener interface and provides definition of contextDestroyed() and contextInitialized().
How to create servlet application in NetBeans IDE?
1 Open Netbeans IDE, Select File -> New Project 2 Select Java Web -> Web Application, then click on Next, 3 Give a name to your project and click on Next, 4 and then, Click Finish 5 The complete directory structure required for the Servlet Application will be created automatically by the IDE.
How to get the instance of servletcontext in Java?
There is only one method defined in the ServletContextEvent class: public ServletContext getServletContext (): returns the instance of ServletContext. There are two methods declared in the ServletContextListener interface which must be implemented by the servlet programmer to perform some action such as creating database connection etc.
How to declare a class as listener in servlet?
We can use @WebListener annotation to declare a class as Listener, however the class should implement one or more of the Listener interfaces. We can define listener in web.xml as: Let’s create a simple web application to see servlet listener in action.