Java Servlets
Understand how Java Servlets handle HTTP requests, manage sessions, and power dynamic web applications.
Servlet Basics
What is a Servlet?
A server-side Java program that handles client requests and generates dynamic responses.
Servlet API
Uses javax.servlet and javax.servlet.http packages to build web applications.
HTTP Methods
doGet(), doPost(), doPut(), and doDelete() methods handle client requests.
Servlet Lifecycle
init()
Called once when the servlet is first loaded.
service()
Handles incoming requests and dispatches to doGet() or doPost().
destroy()
Called once before the servlet is removed from memory.
Advanced Concepts
Session Management
Using HttpSession, Cookies, and URL rewriting to maintain user state.
RequestDispatcher
Forward or include resources within a web application.
Servlet Configuration
Using web.xml or annotations (@WebServlet) for mapping URLs.