Session 1 - Java web programming

This session was conducted by JK. First he talked about why they started ySchool project and what they going to do with this course.From this course I hope that we can get the ability to develop an open source project.

What I learned

What is web programming?

Web programming is about interaction between the computers via browser.JSP and Servlets are Java’s web technologies.

Web Server – The webserver contains the all web data. When a client requests a web object it gives the correct object to the client.

Eg: - Apache Server         

ISS

Servlet Container – It is also a webserver. It is most specific to dynamic data.When we write java related applications the apache server doesn’t accept them.  Therefore we need a servlet.  Servlet can process JSP.

Application Server - Application server also a server which exposes business logic to client applications through various protocols.

Process - when a client request a simple web page

• The client request a simple hello.jsp file to the server

• The server contains the jsp container. Which is used for process JSP pages

• The container knows which servlet controller is appropriate to process this page and send to it.

• Then the servlet page is generated.

• The page is send back to the container as a servlet class file with a response message.

• The container execute it and send the response to the client.

MVC - Model View Controller
MVC is a way of splitting an application in to three parts: a model, a view and a controller.
Nowadays we have to satisfy multiple type of end users. There fore we need a Model View Controller to support different type of users.
In web applications 
JSP pages are the views and the servlets are as controllers.