This document discusses HTTP servlets and how they work. It defines an HTTP servlet as a special type of servlet that handles HTTP requests and responses, usually in the form of HTML pages. It notes that HTTP servlets extend the HttpServlet class and provide HTTP-specific methods like doGet and doPost. The document also explains that servlets run on servers, which are computer programs that accept requests from clients and provide services. It describes how HTTP servlet requests are handled and the constructor and common methods of the HttpServlet class.

1. NADAR SARASWATHI COLLEGE OF ARTS AND SCIENCE
Name : P.Gayathri
Class : I M.Sc(CS)
Topic : HTTP Servlet,Server

2. HTTP Servlet
 A servlet is a Java class that runs in a Java-enabled
server. An HTTP servlet is a special type of servlet that
handles an HTTP request and provides an HTTP
response, usually in the form of an HTML page.
 The HttpServlet class extends the GenericServlet class
and implements Serializable interface. It provides http
specific methods such as doGet, doPost, doHead, doTrace
etc.

3. There are two main servlet types, generic and
HTTP:
 Generic servlets: Extend javax. servlet.
GenericServlet. Are protocol independent.
 HTTP servlets: Extend javax. servlet. HttpServlet.
Have built-in HTTP protocol support and are more
useful in a Sun Java System Web Server
environment.

4. Use of HTTP servlet request
Interface HttpServletRequest. Extends the ServletRequest interface
to provide request information for HTTP servlets. The servlet
container creates an HttpServletRequest object and passes it as an
argument to the servlet's service methods ( doGet , doPost , etc).
String identifier for Basic authentication.

5. Constructor of HttpServlet Class :
 HttpServlet()
This is an abstract class so, the constructor does nothing.

6. Methods of HTTP Servlet:
 doGet, if the servlet supports HTTP GET requests
 doPost, for HTTP POST requests
 doPut, for HTTP PUT requests
 doDelete, for HTTP DELETE requests
 init and destroy, to manage resources that are held for the life of the servlet
 getServletInfo, which the servlet uses to provide information about itself

7. How Http Servlet works ?

8. Server:
 Server is a device or a computer program that accepts
and responds to the request made by other program,
known as client. It is used to manage the network
resources and for running the program or software that
provides services.

9. Server Class:
 ServerSocket Class is used for providing system-
independent implementation of the server-side of a
client/server Socket Connection. The constructor for
ServerSocket throws an exception if it can't listen on the
specified port (for example, the port is already being used). It
is widely used so the applications of java.

11. Types of servers:
There are two types of servers:
 Web Server.
 Application Server

13. The block diagram representation of Application Server is shown below:

14. THANK YOU