What is a DispatcherServlet in Spring?
Table of Contents
- 1 What is a DispatcherServlet in Spring?
- 2 What is the use of dispatcher?
- 3 What is the purpose of DispatcherServlet properties?
- 4 What is the purpose of RequestMapping?
- 5 Why do we use annotation?
- 6 What are the annotations used in Spring MVC?
- 7 What is the use of DispatcherServlet in spring mvc framework?
- 8 What is handleradapter in Spring MVC?
What is a DispatcherServlet in Spring?
In the case of Spring MVC, DispatcherServlet is the front controller. The DispatcherServlet’s job is to send the request on to a Spring MVC controller. A controller is a Spring component that processes the request.
What is the use of dispatcher?
The dispatcher is the module that gives a process control over the CPU after it has been selected by the short-term scheduler. This function involves the following: Switching context. Switching to user mode.
Where do you define DispatcherServlet in Spring boot?
Right in the configuration class which is annotated by @Configuration you could define your dispatcherServlet and pass init-parameter to it. Another way would be to create a paramter map and then set parameter for registration bean. This stream shows how to do it.
What are the annotations used in Spring?
Some of the important Spring MVC annotations are:
- @Controller.
- @RequestMapping.
- @PathVariable.
- @RequestParam.
- @ModelAttribute.
- @RequestBody and @ResponseBody.
- @RequestHeader and @ResponseHeader.
What is the purpose of DispatcherServlet properties?
DispatcherServlet acts as front controller for Spring based web applications. It provides a mechanism for request processing where actual work is performed by configurable, delegate components. It is inherited from javax. servlet.
What is the purpose of RequestMapping?
RequestMapping annotation is used to map web requests onto specific handler classes and/or handler methods. @RequestMapping can be applied to the controller class as well as methods.
Why do we need multiple dispatcher servlet in Spring?
A web application can define any number of DispatcherServlets. Each servlet will operate in its own namespace, loading its own application context with mappings, handlers, etc. Only the root application context as loaded by ContextLoaderListener, if any, will be shared.
Which statements are true about DispatcherServlet?
Which statements are true about DispatcherServlet? DispatcherServlet is an expression of the “Front Controller” design pattern . The DispatcherServlet is the actual Servlet . DispatcherServlet is declared in the web.
Why do we use annotation?
Why Annotate? By annotating a text, you will ensure that you understand what is happening in a text after you’ve read it. As you annotate, you should note the author’s main points, shifts in the message or perspective of the text, key areas of focus, and your own thoughts as you read.
What are the annotations used in Spring MVC?
Spring Annotations: Contents:
| Annotation | Package Detail/Import statement |
|---|---|
| Spring MVC Annotations | |
| @Controller | import org.springframework.stereotype.Controller; |
| @RequestMapping | import org.springframework.web.bind.annotation.RequestMapping; |
| @PathVariable | import org.springframework.web.bind.annotation.PathVariable; |
What is a DispatcherServlet Mcq?
Explanation: A Spring MVC controller—often referred to as a Dispatcher Servlet—implements one of Sun’s core Java EE design patterns called front controller. 2. Class used to give a class behavior of a Dispatcher Servlet.
What is RequestMapping in Spring MVC?
@RequestMapping is one of the most widely used Spring MVC annotation. annotation. RequestMapping annotation is used to map web requests onto specific handler classes and/or handler methods. @RequestMapping can be applied to the controller class as well as methods.
What is the use of DispatcherServlet in spring mvc framework?
Spring – MVC Framework The DispatcherServlet. The Spring Web model-view-controller (MVC) framework is designed around a DispatcherServlet that handles all the HTTP requests and responses. Required Configuration. You need to map requests that you want the DispatcherServlet to handle, by using a URL mapping in the web.xml file. Defining a Controller.
What is handleradapter in Spring MVC?
4.1. SimpleControllerHandlerAdapter. This is the default handler adapter registered by Spring MVC.
What is a controller in Spring MVC?
A front controller is defined as “a controller which handles all requests for a Web Application.” DispatcherServlet (actually a servlet) is the front controller in Spring MVC that intercepts every request and then dispatches/forwards requests to an appropriate controller.