Java J2EE Tutorials in Urdu/Hindi Develop and Deploy Servlet

In this tutorial we will learn about to develop Servlet in Intellij idea and deploy on JBoss Server .

#Introduction

Servlet technology is primarily designed for use with the HTTP protocol of the Web.Servlets are Java programs that run on a Web server. Java servlets can be used to process
client requests or produce dynamic Web pages. For example, you can write servlets togenerate dynamic Web pages to process client registration form and store registration data
into a database.

#Servlets Packages

Servlet is Java EE server driven technology to create web applications in java.
The javax.servlet and javax.servlet.http packages provide interfaces and classes for
writing our own servlets.
All servlets must implement the javax.servlet.Servlet interface, which defines servlet
lifecycle methods. When implementing a generic service.

#Servlet Mapping

Servlet mapping specifies the web container of which java servlet should be invoked for a url given by client. It maps url patterns to servlets. When there is a request from a client,servlet container decides to which application it should forward to. Then context path of url is matched for mapping servlets.
Servlets should be registered with servlet container. For that, you should add entries in web deployment descriptor web.xml. It is located in WEB-INF directory of the web
application.


servlet-mapping has two child tags, url-pattern and servlet-name. url-pattern specifies the type of urls for which, the servlet given in servlet-name should be called. Be aware that, the container will use case-sensitive for string comparisons for servlet matching.

#HttpServlet class

HttpServlet is an abstract class that extends GenericServlet and provides base for creating HTTP based web applications. There are methods defined to be overridden by subclasses
for different HTTP methods.

 doGet, for HTTP GET requests
 doPost, for HTTP POST requests
 doPut, for HTTP PUT requests
 doDelete, for HTTP DELETE requests


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