This Presentation is useful to make PPT on the topic "Servlet and Servlet Life Cycle" in Advanced Java. This Presentation is also useful to study this topic.

1. Name: Dhrumil I. Panchal
Sem: 6th Semester
Subject: Advanced Java
Branch: Computer Engineering (B.E.)
Year: 2019-20

2. Servlet and Servlet Life Cycle

3.  Servlet
 Life Cycle of Servlet

4.  Servlet is java class which extends the functionality of
web server by dynamically generating web pages.
 Servlet technology is used to create Dynamic web
application.

5.  In the life cycle of servlet there are three important
methods. These methods are
1. init()
2. service()
3. destroy()

7.  The client enters the URL in the web browser and makes
a request. The browser then generates the HTTP request
and sends it to the Web server.
 Web server maps this request to the corresponding
servlet.

8.  The server basically invokes the init() method of servlet. This
method is called only when the servlet is loaded in the
memory for the first time.
 The class loader is responsible to load the servlet class.
 The servlet class is loaded when the first request for the
servlet is received by the web container.
 The web container creates the instance of a servlet after
loading the servlet class. The servlet instance is created only
once in the servlet life cycle.
 The web container calls the init method only once after
creating the servlet instance. The init() method is used to
initialize the servlet.

9. public void init(ServletConfig config)throws
ServletException
{
//Servlet Initialization…
}
 A servlet configuration object used by a servlet container
to pass information to a servlet during initialization.

10.  The service() method is the main method to perform the
actual task.
 The servlet container (i.e. web server) calls the service()
method to handle requests coming from the client( browsers)
and to write the response back to the client.
 Each time the server receives a request for a servlet, the
server spawns a new thread and calls service.
public void service(ServletRequest request,
ServletResponse response) throws ServletException,
IOException
{
//Servlet Task
}

11.  Finally server unloads the servlet from the memory using
the destroy() method.
 The destroy() method is called only once at the end of the
life cycle of a servlet.
 This method gives your servlet a chance to close
1. database connections,
2. halt background threads,
3. write cookie lists or hit counts to disk, and
4. perform other such cleanup activities.

12.  After the destroy() method is called, the servlet object is
marked for garbage collection.
public void destroy()
{
// Finalization code...
}

13. import java.io.*;
import javax.servlet.*;
public class MyServlet1 extends GenericServlet
{
public void init() throws ServletException
{
//Initailization Code
}
public void service(ServletRequest request, ServletResponse response)
throws ServletException,IOException
{
//Servlet code
}

14. public void destroy()
{
//Finalization Code
}
}

15.  Inspiration from Prof. Jayna Shah
 Notes of AJAVA
 Textbook of AJAVA
 Images from Google Images
 Some my own Knowledge

16. class Thankyou
{
public static void main(String args[])
{
System.out.println(“Thank You”);
}
}