What is the difference between a Java Servlet and a JSP (Java Server Page)?

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A Java Servlet and a JSP (Java Server Page) both serve the purpose of handling dynamic web content in Java-based web applications, but they have key differences in how they work and where they are used:

Purpose & Usage

Servlet: A Java class that handles HTTP requests and responses. It is used primarily for processing logic, such as handling form submissions, interacting with databases, and managing sessions.

JSP: A web page with embedded Java code, used mainly for presenting dynamic content. It is better suited for generating HTML and UI-related tasks.

Code Structure

Servlet: Requires writing Java code for both logic and content generation, making it less readable when dealing with complex HTML.

JSP: Allows embedding Java inside HTML using special tags (<% %>), making it more convenient for UI-focused development.

Compilation & Execution

Servlet: Manually compiled into a .class file and deployed.

JSP: Automatically compiled into a servlet by the server upon first request.

Separation of Concerns

Servlet: Encourages logic-heavy code, making it harder to separate business logic from presentation.

JSP: Promotes separation by allowing UI designers to work on HTML while backend developers handle the logic (especially when using JSP with JavaBeans or custom tags).

Performance

Servlet: Generally faster because it is pure Java and avoids the overhead of JSP compilation.

JSP: Slightly slower on first execution due to compilation but performs similarly afterward.

When to Use What?

Use Servlets when dealing with backend processing, business logic, or handling API requests.

Use JSPs when generating web pages with dynamic content, but preferably with JSP EL (Expression Language) and JSTL (Java Standard Tag Library) to reduce embedded Java code.

In modern Java web development, JSPs are often replaced by frameworks like Thymeleaf or JSF, while Servlets still play a role in backend logic within frameworks like Spring.

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