What is ServletContextAware?
public interface ServletContextAware extends Aware. Interface to be implemented by any object that wishes to be notified of the ServletContext (typically determined by the WebApplicationContext ) that it runs in.
What is spring boot ServletContext?
It’s used to wire the configurations from Spring beans together and use them for the application. Use ApplicationContext if you want to retrieve the information of Spring beans. Use ServletContext if you want to get/set attribute those shared to all Servlet.
How do you get ServletContext reference inside servlet?
Example of getServletContext() method
- //We can get the ServletContext object from ServletConfig object.
- ServletContext application=getServletConfig().getServletContext();
- //Another convenient way to get the ServletContext object.
- ServletContext application=getServletContext();
What is web application context?
WebApplicationContext is used to create web applications. ApplicationContext is the parent of the WebApplicationContext interface. WebApplicationContext is the child of the ApplicationContext interface. In the case of ApplicationContext, we have to create and destroy the container objects manually.
What is context loader listener?
ContextLoaderListner is a Servlet listener that loads all the different configuration files (service layer configuration, persistence layer configuration etc) into single spring application context. This helps to split spring configurations across multiple XML files.
What is ApplicationContext Spring MVC?
ApplicationContext is an interface for providing configuration information to an application. There are multiple classes provided by springframework that implements this interface and helps us use configuration information in applications. ApplicationContext provides standard bean factory lifecycle capabilities.
Does Spring boot use dispatcher servlet?
A typical MVC database driven Spring MVC application requires a lot of configuration such as dispatcher servlet, a view resolver, Jackson, data source, transaction manager, among many others. Spring Boot auto-configures a Dispatcher Servlet if Spring MVC jar is on the classpath.
What are DispatcherServlet and ContextLoaderListener?
Basic. The task of the DispatcherServlet is to send request to the specific Spring MVC controller. ContextLoaderListener reads the Spring configuration file (with value given against contextConfigLocation in web.xml ), parses it and loads the singleton bean defined in that config file.
What is ServletConfig and ServletContext with example?
ServletConfig is an object containing some initial parameters or configuration information created by Servlet Container and passed to the servlet during initialization. ServletConfig is for a particular servlet, that means one should store servlet specific information in web. xml and retrieve them using this object.
Why ApplicationContext is used in Spring?
ApplicationContext is a corner stone of a Spring Boot application. It represents the Spring IoC container and is responsible for instantiating, configuring, and assembling the beans. The container gets its instructions on what objects to instantiate, configure, and assemble by reading configuration metadata.
What is the role of HttpServletRequest?
Interface HttpServletRequest. Extends the ServletRequest interface to provide request information for HTTP servlets. The servlet container creates an HttpServletRequest object and passes it as an argument to the servlet’s service methods ( doGet , doPost , etc). String identifier for Basic authentication.
What is the difference between bean factory and ApplicationContext?
While the BeanFactory provides basic functionality for managing and manipulating beans, often in a programmatic way, the ApplicationContext provides extra functionality like MessageSource, Access to resources, Event propagation to beans, Loading of multiple (hierarchical) contexts etc.
Why we use ApplicationContext xml in Spring?
Applicationcontext. xml – It is standard spring context file which contains all beans and the configuration that are common among all the servlets. It is optional file in case of web app. Spring uses ContextLoaderListener to load this file in case of web application.