Java :
Java is a well-known programming language that is widely used by programmers all over the world. Thousands of web apps have been developed and are still being built in Java.
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Java web application.
- Web Server and client
- Understanding URL
- Why do we need Servlet and JSP?
- HTML and HTTP
- Web Application Directory Structure
- Initial web Application with Servlet and JSP
- Deployment Descriptor
- Web container
Web Server and client
A web server is a software that processes client requests and returns the result to the consumer. A web server is a physical machine that listens to a specific port for consumer requests.
A web client is a software system that assists in a transaction with the server. Some of the most widely used internet clients are Firefox, Safari, and so on. When we request something from the server, the web customer is responsible for transmitting an invitation to the server, parsing the server response, and providing it to the user.
HTML and HTTP
Because the web server and web client are two distinct software applications, they must communicate using a common language. HTML, which stands for the hypertext markup language, is the common language between server and client.
HTTP is the communication protocol used between the web server and the consumer. HTTP is based on TCP/IP transmission protocol.
Understanding URL
URL is an abbreviation for Universal Resource Locator, and it is used to locate a server and its resources. Every resource on the internet has its own unique address.
Why do we need Servlet and JSP?
Web servers are useful for static HTML pages, but they cannot create dynamic content or a method to save knowledge in databases. For dynamic content, there are numerous programming languages available, including Ruby, Java Servlets, PHP, Python, JSP, and Ruby on Rails.
JSP and Java Servlet are unit server aspect technologies that enable internet servers to be more capable by supporting dynamic response and knowledge persistence.
Web container
Tomcat is a web container that, when a request is sent from a client to an internet server, and then passes the request to internet instrumentation, which searches for the appropriate resource to handle the request (servlet or JSP) from the resource to create the response and send it to the internet server. The response is then sent back to the user via the internet server.
Web Application Directory System
The internet Archive (WAR) format is used to package Java Applications, and it has a well-defined structure. You can export a WAR file from a dynamic internet project and unfasten it to inspect the hierarchy.
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Deployment Descriptor
The web.xml file is the net application’s initialization descriptor, and it provides the mapping for servlets welcome pages, security parameters, and session timeout settings, among other things.
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