10. WEB APPLICATION DEVELOPMENT Part-1 By LN RAO | 04-NOV-24 | Ashok IT

Summary

LN Rao introduces Java-based web application development as the next step after learning core Java. While core Java examples often use standalone applications to teach the language and object-oriented programming, Java is widely used in industry for web and distributed applications.

The course focuses on web application development, including MVC architecture. Later topics include JDBC connection pooling and calling stored procedures with CallableStatement.

Website Basics and Architecture

A website is a collection of web pages associated with an organization and a unique domain name. To make its pages available to users, the website must be hosted on a web server.

Websites use a client-server architecture:

• A web client, usually a browser, requests web resources.
• A web server receives requests and supplies resources. The computer running the server software is called the server machine.
• The client and server communicate using HTTP (Hypertext Transfer Protocol). The client sends an HTTP request, and the server returns an HTTP response.

“Browser,” “web client,” and “HTTP client” refer to the client side; “web server” and “HTTP server” refer to the server side. Web resources include not only pages but also images, audio, and video.

A domain name is easier for people to use than an IP address. DNS resolves the domain name to an IP address so the browser can reach the relevant machine.

Static Websites and Web Applications

The lecture distinguishes static websites from dynamic websites, which are also called web applications.

Static Websites

A static website provides general information that is the same for all visitors. It does not process user input to return a user-specific response. Following links to navigate between pages does not, by itself, count as interaction.

Static websites typically consist of pre-created HTML pages stored on a web server. A basic static website does not require a database or server-side programming; HTML and CSS can be sufficient.

Dynamic Websites and Web Applications

A dynamic website provides information and interactive, user-specific services. It takes input and returns a response based on that input. Examples include logging in, checking account balances, viewing marks, and retrieving fee details.

Dynamic websites require server-side programming to process requests and commonly use a database. For example, a server-side program can handle submitted login credentials, check them against stored data, and return an appropriate result.

The lecture describes dynamic website development as a typical role for full-stack developers, including Java professionals.

Similarities Between Static and Dynamic Websites

Both types of websites:

• Provide information to users online.
• Need a web server to host and serve their resources.
• Use HTTP communication and a browser to display pages.
• Have domain names.
• Use HTML and CSS to build web pages.

Student Questions and Clarifications

In the closing Q&A, the instructor explains that information on a static site is generally entered in advance and stored in HTML files on the web server. Visitors can view the information and follow links, but they do not submit data to receive a personalized response. Login functionality, by contrast, is dynamic because it involves processing user input.

Speakers and Sources

• LN Rao — instructor and primary speaker.
• Unidentified students — ask questions during the closing Q&A. No student names are clearly established in the subtitles.