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What is jsp?

  • JSP, which stands for JavaServer Pages, is a technology used for building dynamic web applications in Java. It allows developers to create web pages that can generate dynamic content and interact with databases, making it a fundamental component of web development in Java.

key aspects of JSP

  • Dynamic Web Pages: JSP enables the creation of dynamic web pages by embedding Java code directly within HTML or XML markup.
  • Servlet-Based: Under the hood, JSP pages are compiled into Java servlets by the web container (e.g., Apache Tomcat).
  • HTML Integration: JSP pages can contain standard HTML code, making it easy to create user interfaces and web forms.
  • Scriptlet Tags: JSP provides special tags, such as <% %>, for embedding Java code (scriptlets) directly into the page.

Advantages of JSP

  • JSP offers an efficient and more straightforward approach to coding dynamic web pages.
  • JSP provides a wide variety of pre-built tags and custom tags, which can be used to add functionality to web pages
  • JSP allows developers to separate the presentation of the web page from the logic and processing, making it easier to maintain the web application.
  • Web Container (or application server like tomcat) handles changes when changes are done in the JSP code and does not need recompilation.
JSP Servlet
Extension to Servlet Not an extension to servlet
Easy to Maintain Bit complicated
No need to recompile or redeploy The code needs to be recompiled
Less code than a servlet More code compared to JSP
These notes cover the fundamental concepts and considerations related to JavaServer Pages (JSP). JSP remains a valuable technology for web development, particularly in scenarios where server-side rendering and dynamic content generation are essential.

Life Cycle of JSP

The JSP pages follow these phases:
  • Translation of JSP Page
  • Compilation of JSP Page
  • Classloading (the classloader loads class file)
  • Instantiation (Object of the Generated Servlet is created)
  • Initialization ( the container invokes jspInit())
  • Request processing ( the container invokes _jspService())
  • Destroy ( the container invokes jspDestroy())
As depicted in the above diagram, a JSP page is translated into Servlet by the help of JSP translator. And then, JSP translator is a part of the web server which is responsible for translating the JSP page into Servlet.