JSP is a technology used for building dynamic web pages in Java, It allows developers to embed Java code with HTML pages, enabling the creation of content that is generated dynamically and can interact with Java objects and components.
Key concepts and features of JSP:-
Dynamic Content:
JSP pages create dynamic content by embedding Java code within HTML or XML-like tags.
The dynamic content is processed on the server before being sent to the client's web browser
Scripting Elements:
JSP pages allow various scripting elements, including declarations, scriptlets, and expressions, which allow the inclusion of Java code directly on the page.
Tag Libraries:
JSP provides custom tag libraries that encapsulate complex behavior and allow developers to use high-level tags to perform common tasks without writing extensive Java code.
Java Standard Tag Library and custom tag libraries developed by third parties are included.
Integration with Servlets:
JSP pages are ultimately translated into servlets by the Java web container during runtime.
JSPs can be seamlessly integrated with Java Servlets, allowing for a combination of servlets and JSP to build web applications.
Lifecycle:
JSP has a lifecycle similar to servlets, including initialization, request processing, and destruction phases.
The JSP container manages the lifecycle, and the developer can implement certain methods for initialization and cleanup.
Expression Language:
Java Server Pages support expression language, for accessing data stored in javabeans components.
JSP simple Hello World program
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Hello JSP</title>
</head>
<body>
<h1>Hello, World! This is a simple JSP program.</h1>
</body>
</html>
Comments