this is about full stack backend servlets Today we all are aware of the need to create dynamic web pages i.e. the ones that can change the site contents according to the time or can generate the content according to the request received by the client. If you like coding in Java, then you will be happy to know that using Java there also exists a way to generate dynamic web pages and that way is Java Servlet. But before we move forward with our topic let’s first understand the need for server-side extensions.Servlet is a technology which is used to create a web application. Servlet is an API that provides many interfaces and classes including documentation. Servlet is an interface that must be implemented for creating any Servlet. Servlet is a class that extends the capabilities of the servers and responds Servlet is a technology which is used to create a web application. Servlet is an API that provides many interfaces and classes including documentation. Servlet is an interface that must be implemented for creating any Servlet. Servlet is a class that extends the capabilities of the servers and respondsn Servlets are the Java programs that run on the Java-enabled web server or application server. They are used to handle the request obtained from the webserver, process the request, produce the response, then send a response back to the webserver. In Java, to create web applications we use Servlets. To create Java Servlets, we need to use Servlet API which contains all the necessary interfaces and classes. Servlet API has 2 packages namely, javax.servlet javax.servlet.http

2. 3/23/2024 2
Jakarta Servlet
Methods
Servlet
Classes
Servlet
Interface
Servlets API

3. S E R V L E T

4. Servlet API
Servlet API contains a number of classes and interfaces that describe the contracts between a
servlet class and the runtime environment provided for an instance by a conforming servlet
container.
Servlet API provides the following two packages that contain its classes and interfaces:
javax.servlet.*; Classes and interfaces defines the contracts between a Servlet class and the
runtime environment provided for an instance of such a class by a conforming
Servlet container.
javax.servlet.http.*; Classes and interfaces defines the contracts between a Servlet class running under
the HTTP protocol and the runtime environment provided for an instance of such a
class by a conforming Servlet container.

5. Servlet Serialization
Servlet Config
Generic Servlet
Http Servlet
User Defined Servlet
INTERFACES
BUILD IN CLASSES

7. Generic Servlet Abstract Class
 GenericServlet implements Servlet interface
 It defines Servlet generic and independent of protocols
 It doesn’t give implementation for service method of Servlet interface
 If your Servlet Generic class, then it should implement service method

8. Generic Servlet Abstract Class
Method

9. Generic Servlet Abstract Class
Method

10. Http Servlet Abstract Class
Method

11. init
service
destroy
getServletInfo
getServletConfig
Init method is called by Servlet container to indicate to a Servlet
that it is being placed into service.
Declaration:
void init(ServletConfig config)

12. init
service
destroy
getServletInfo
getServletConfig
Service method is called by the Servlet container to allow the
Servlet to respond to a request.
Declaration:
public void service(HttpServletRequest req, HttpServletResponse
res) throws ServletException, java.io.IOException

13. init
service
destroy
getServletInfo
getServletConfig
Destroy method indicates that the Servlet is being taken out of
service
Declaration:
public void destroy()

14. init
service
destroy
getServletInfo
getServletConfig
getServletInfo method returns information about the Servlet
Declaration:
public String getServletInfo()

15. init
service
destroy
getServletInfo
getServletConfig
Returns a ServletConfig object that contains initialization and
start-up parameters for this Servlet
Declaration:
public ServletConfig getServletConfig()

16. Thank You