Notes

Introduction to JSP

What is JSP?

• JSP (JavaServer Pages) = Presentation logic* + Business logic
• Servlet = Business logic* + Presentation logic
• JSP is converted into servlet during execution
• JSP is considered outdated in modern web development

JSP Syntax Elements

1. Directive <%@ ... %>

Instructs JSP engine to process the JSP file.

Types of Directives:

• @page - Controls servlet creation/translation
• @include - Includes JSP/HTML into another JSP
• @taglib - Uses custom/third-party tags in JSP

2. Declaration <%! ... %>

• Declares fields and methods in generated servlet
• Code goes outside the service() method
• Used for instance variables and helper methods

3. Scriptlet <% ... %>

• Contains Java statements executed for each request