Web Component - Servlet Overview

A Java program that runs on a web server, processing client requests and producing dynamic web pages; often used for handling HTTP requests.

A web application component that processes HTTP requests and generates dynamic content; a key part of server-side programming.

A sequence of steps a servlet goes through: loading, instantiation, initialization, processing requests, and termination.

To handle HTTP requests and create responses for dynamic web pages on servers.

Servlets are primarily designed to work with the HTTP protocol.

A file system that delivers web pages directly from files, without any processing.

Hypertext Transfer Protocol; the protocol used for communication between web browsers and web servers.

A request method for retrieving data from a specified resource. Data is sent in the URL.

A request method for submitting data to a resource. Data is sent in the request body.

A Java program that extends web server functionality by creating dynamic content for web pages.

A set of Java interfaces and classes that support servlets.

Servlet's initialization method, called by the web container once.

Servlet's method to process incoming requests and generate responses.

Extra information sent with a web request, often used to provide context or data for the server to process.

Used to retrieve the value of a single request parameter, returning a String value or null if the parameter doesn't exist.

Used to retrieve multiple values for a request parameter, returning an array of Strings or null if the parameter doesn't exist.

A way to configure servlets using annotations directly in the code, eliminating the need for a separate deployment descriptor (web.xml).

A configuration file used to deploy web applications on a web server, containing settings for servlets, filters, and other components.

A specification that introduced annotations for configuring servlets, simplifying deployment and reducing the need for web.xml configurations.

A popular web server that supports Servlet API 3.0 annotations, allowing for easier deployment of annotated servlets.

A configuration file containing settings for a web application, often used to declare servlets and map them to URLs.

The process of configuring a servlet within a web application to make it accessible to client requests.

An XML file (WEB-INF/web.xml) that defines the mapping between URL patterns and servlet classes.

Associating a specific URL pattern with a servlet class in the deployment descriptor.

The process of maintaining information about a specific user's interactions with a web application over a period of time.

HTTP connections are stateless, meaning each request is treated independently without knowledge of previous interactions.

A series of related interactions between a single client and a web server over a period of time.

A session tracking technique that stores data in hidden input fields of HTML forms, which are submitted back to the server with subsequent requests.

Small text files stored on the client's machine by the server, containing name-value pairs that can be used to track user sessions.

Session tracking technique where user data is appended to the URL as parameters, sent with every request.

A method used to retrieve values from HTTP requests, including hidden fields and URL parameters.

The duration for which a user's session data is retained on the server before being discarded.

The overall process of tracking and managing user sessions, including techniques like hidden values, cookies, URL rewriting, and session objects.

Storing user data directly within the HTML of a web page, making it accessible to the server. This method is considered insecure and impractical for large datasets.

Using small text files stored on the user's computer to store session data. This method is vulnerable to security risks and can be difficult to manage for large datasets.

The Java Servlet API class used for managing user sessions. It provides methods for storing, retrieving, and manipulating session data.

1. On the first request, the web server generates a unique session ID and sends it to the client. 2. The client sends back the session ID with each request. 3. The server uses the session ID to identify the client's session and associates it with the request.

A Servlet API method for obtaining data from a URL, which is used to access session data at the server side.

A Servlet API method that retrieves an existing user session or creates a new one if none exists.

The Java Servlet API provides a secure and robust method for session tracking, allowing for the storage and manipulation of large amounts of data on the server side.