Servlet is a Java web technology used to build dynamic web applications. It runs on a web container (like Tomcat) and handles client requests (browser/Postman) using the HTTP protocol. Servlets are mainly used for request processing, form handling, session management, and server-side business logic in Java web apps.
Key Features of Servlet
- Server-side Request Handling: Processes HTTP requests like GET, POST, PUT, DELETE.
- Platform Independent: Works on any OS with a supported servlet container.
- Fast and Scalable: Multithreaded by default, better than CGI.
- Session Management: Supports cookies, URL rewriting, and HttpSession.
- MVC Support: Works perfectly with JSP and frameworks like Spring MVC.
Servlet Basics
Covers the foundation of Servlet, including its introduction, architecture, lifecycle, and servlet container basics.
- Introduction
- Servlet Architecture
- Servlet Container (Tomcat)
- Request Flow (Client -> Server -> Servlet -> DB)
- Servlet Lifecycle
- ServletConfig and ServletContext
- doGet() and doPost()
- Servlet vs JSP
- Servlet vs CGI
Servlet Setup and First Program
Explains how to create and run a servlet project using Eclipse/IntelliJ, and configure it using web.xml or annotations.
- Create Servlet Project in Eclipse
- Configure Apache Tomcat
- First Servlet Program Example
- web.xml Configuration
- @WebServlet Annotation
- Deploy and Run on Server
Servlet Request and Response Handling
Covers how servlet receives client data and sends responses back to browser.
- HttpServletRequest
- HttpServletResponse
- GET vs POST Request
- Reading Form Data using getParameter()
- Servlet - Client HTTP Request
- Servlet - Response
- Servlet - Fetching Result
- Redirect vs Forward
Servlet Session Management
Introduces session handling concepts and methods used in real web applications.
- Introduction
- Session Tracking
- Session and Cookies in Servlet
- URL Rewriting
- Hidden Form Fields
- HttpSession
- Login Logout using Session
- Difference between Cookie and Session
Servlet Filters
Explains how filters work in real applications for validation, logging, and security.
Servlet Listeners & Exception Handling
Covers event-driven programming using listeners and proper exception handling techniques to build robust and error-resilient servlet applications.
Advanced Concepts
Covers database integration and advanced real-world features used in production-level servlet applications.
- JDBC Connection in Servlet
- Crud Operation
- File Upload using Servlet
- Download File using Servlet
- Pagination in Servlet
Servlet Interview Questions
Covers commonly asked interview questions on servlets to help in quick revision and interview preparation.