![class Thankyou
{
public static void main(String args[])
{
System.out.println(“Thank You”);
}
}](https://image.slidesharecdn.com/ajava-201011091111/85/Servlet-and-Servlet-Life-Cycle-16-320.jpg)
Servlet and Servlet Life Cycle
- 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”); } }