| What is different between web server and application server? |
| What is MIME Type? |
| What is a web application and what is its directory structure? |
| What is a servlet? |
| What are the advantages of Servlet over CGI? |
| What are common tasks performed by Servlet Container? |
| What is ServletConfig object? |
| What is ServletContext object? |
| What is Request Dispatcher? |
| What is the use of servlet wrapper classes? |
| What is SingleThreadModel interface? |
| What is the inter-servlet communication? |
| What is servlet attributes and their scope? |
| What are the phases of servlet life cycle? |
| What are life cycle methods of a servlet? |
| What is URL Encoding? |
| What are different methods of session management in servlets? |
| What is URL Rewriting? |
| What is the effective way to make sure all the servlets are accessible only when user has a valid session? |
| What is a deployment descriptor? |
| What are important features of Servlet 3? |
| What are different ways for servlet authentication? |
| Write a servlet to upload file on server. |
| Why HttpServlet class is declared abstract? |
| why we should override only no-agrs init() method. |
| Why do we have servlet filters? |
| Why do we have servlet listeners? |
| Which HTTP method is non-idempotent? |
| How can we create deadlock situation in servlet? |
| How do we call one servlet from another servlet? |
| How can we invoke another servlet in a different application? |
| How does Cookies work in Servlets? |
| How to notify an object in session when session is invalidated or timed-out? |
| How to handle exceptions thrown by application with another servlet? |
| How to make sure a servlet is loaded at the application startup? |
| How to get the actual path of servlet in server? |
| How to get the server information in a servlet? |
| How do we go with database connection and log4j integration in servlet? |
| How to get the IP address of client in servlet? |
| How can we achieve transport layer security for our web application? |
| Difference - GET and POST method? |
| Difference - ServletConfig and ServletContext? |
| Difference - PrintWriter and ServletOutputStream? |
| Difference - GenericServlet and HttpServlet? |
| Difference - ServletResponse sendRedirect() and RequestDispatcher forward() method? |
| Difference - encodeRedirectUrl and encodeURL? |
| Are Servlets Thread Safe? How to achieve thread safety in servlets? |
| Can we get PrintWriter and ServletOutputStream both in a servlet? |
| Do we need to override service() method? |
| Is it good idea to create servlet constructor? |
- It is a technology which is used to create a web application.
- It is an API that provides many interfaces and classes including documentation.
- It is an interface that must be implemented for creating any Servlet.
- It is a class that extends the capabilities of the servers and responds to the incoming requests. It can respond to any requests.
- It is a web component that is deployed on the server to create a dynamic web page.
- A war (web archive) File : It contains files of a web project. It may have servlet, xml, jsp, image, html, css, js etc. files.
- Servlet class is loaded.
- Servlet instance is created.
- init method is invoked.
- service method is invoked.
- destroy method is invoked.
- The welcome-file-list element of web-app, is used to define a list of welcome files.
- Its sub element is welcome-file that is used to define the welcome file.
- A welcome file is the file that is invoked automatically by the server, if you don't specify any file name.
- Servlet - ServletRequest, ServletResponse
- SingleThreadModel
- Filter - FilterConfig, FilterChain
- ServletRequestListener
- ServletRequestAttributeListener
- ServletContextListener
- ServletContextAttributeListener
- GenericServlet
- ServletInputStream
- It provides stream to read binary data such as image etc. from the request object.
- It is an abstract class.
- getInputStream()- ServletRequest interface returns the instance of ServletInputStream class.
- ServletOutputStream
- It provides a stream to write binary data into the response. It is an abstract class.
- The getOutputStream() method of ServletResponse interface returns the instance of ServletOutputStream class.
- ServletRequestWrapper & ServletResponseWrapper
- ServletRequestEvent & ServletContextEvent
- ServletRequestAttributeEvent & ServletContextAttributeEvent
- ServletException
- UnavailableException
- HttpServletRequest & HttpServletResponse
- HttpSessionListener
- HttpSessionAttributeListener
- HttpSessionBindingListener
- HttpSessionActivationListener
- HttpSessionContext (deprecated now)
- HttpServlet
- Cookie - Cookie remains active as long as the user’s browser is running, as soon as the browser is closed, the cookie and associated session info is destroyed
- HttpServletRequestWrapper & HttpServletResponseWrapper
- HttpSessionEvent
- HttpSessionBindingEvent
- HttpUtils (deprecated now)
- Web application
- Implicit objects
- JSP directives
- Server - Web, Application
- MIME Type
- The Hypertext Transfer Protocol (HTTP) - Requests, Responses
- HTTP method - Get, Post, Put, Head, Delete, Options
- HTTPServletRequest & HTTPServletResponse
- Servlet - Lifecycle, Servlet container
- GenericServlet & HttpServlet
- Deployment descriptor
- War File
- welcome-file-list
- Load on startup
- ServletConfig object& ServletContext object
- Event and Listener
- Servlet Collaboration - RequestDispacher, sendRedirect
- Filter - Authentication Filter, FilterConfig
- Request Dispatcher - Send Redirect vs. Forward
- URL Encoding & URL Rewriting
- Inter servlet communication
- Cookies & Session - Create, Read, Update, Delete
- SingleThreadModel interface
- Servlet attributes - Scope
- encodeRedirectUrl and encodeURL
- Servlet wrapper classes
- PrintWriter and ServletOutputStream
- Localization
- Servlet Invoker
- Servlet lazy loading
- Servlet Chaining
- Servlet mapping
- PageAutoRefresh
LifeCycle
web.xml - Welcome-file-list
Interfaces in javax.servlet package
Classes in javax.servlet package
Interfaces in javax.servlet.http package
Classes in javax.servlet.http package
Points to remember
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