Java Servlet Programing Laungage

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Java

Servlet

Servlet Basics

Java Servlet Tutorial

Servlet Introduction

Servlet Life Cycle

Non Life Cycle Method of Servlet Interface

How to run the Servlet program

Servlet Exception Handling

Implementation of GenericServlet

Difference between HttpGet() and HttpPost()

Difference between Attributes and Parameters

First Servlet Program

State Management

Servlet Cookies

HttpSession Object

Commonly used methods of HttpSession

Servlet sendRedirect

Example of sendRedirect

How a Servlet Works

Six steps to running your first Servlet

Play Video song using servlet

Manipulating multiple value parameters

Java Servlet Projects

Servlet Project 3

Java Servlet Examples

access servlet information

count number of time servlet access

display digital clock in servlet

access servlet cookie

getting information about session

Enumeration form values

Iterator form values

generate Fibonacci series

generate random numbers

generate random values

read data from file

write data into file

upload (save) file in hard disk

upload (save) multiple file in hard disk

store data into List

Java Servlet Interview materials

Servlet subjective question

Servlet Interview question

Servlet Objective question

Servlet FAQS

Java Servlet : Methods of ServletConfig interface

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getServletContext() is used to obtain the reference of sevletContext object.

Syntax

	public ServletContext getServletContext();

getInitParameter() is used to obtain the value of initialization parameter.

Syntax

	public String getInitParameter(String name);

getInitParameterNames() returns an enumeration for the name of initialization parameters stored in ServletConfig.

Syntax

	public Enumeration getInitParameterNames();

Similarities and Difference between servletContext and ServletConfig

Similarities

Both these interfaces are in same javax.servlet package
The vendors of Web Server (which support servlet technology) provide the implementation classes for theses two interfaces

Differences :

Only one ServletContext object will existed for one Web Application . One Servlet Configuration object existed per a Servlet in a Web Application.
A ServletContext object will be shared by all the Servlets which are present in Web Application . Every Servlet of a Web Application contain individually a Servlet Configuration object.
A ServletContext defines a set of methods that a Servlet uses to communicate with its Servlet Container . The ServletConfig is to pass configuration information to a Servlet . The Server passes an object that implements the ServletConfig interface to the Servlet's init() method
ServletContext object is used to access the Context parameters specified in web.xml file. A Servlet Config object is used to access the Initialization parameters specified for particular Servlet in a web.xml file.