1. Introduction
In Java, Servlets and JavaServer Pages (JSP) are two technologies used for creating web applications. A Servlet is a Java class that handles HTTP requests and generates responses. JSP is a technology that allows you to write dynamic content in HTML pages with Java code embedded into it, which is easier to write compared to a Servlet.
2. Key Points
1. Servlets are Java programs that run on a server and are used for handling request-response handling.
2. JSPs are text-based documents that execute as servlets but allow a more natural way to create static and dynamic content.
3. Servlets are best for processing data and controlling the business logic.
4. JSPs are best suited for creating the view and presenting the front end.
3. Differences
| Servlet | JSP |
|---|---|
| A Servlet is a Java class that handles HTTP requests and generates responses. | JSP is a technology that allows you to write dynamic content in HTML pages with Java code embedded into it. |
| Servlets are best for processing data and controlling business logic. | JSPs are best suited for creating the view and presenting the front end. |
| Harder to maintain when used for presenting HTML content. | Better separation of business logic from presentation. |
4. Example
// Example of a Servlet
@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println("<h1>Hello, World!</h1>");
out.println("</body></html>");
}
}
// Example of a JSP
// hello.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h1>Hello, World from JSP!</h1>
</body>
</html>
Output:
// Output from HelloServlet Hello, World! // Output from hello.jsp Hello, World from JSP!
Explanation:
1. HelloServlet is a Java class extending HttpServlet that overrides the doGet method to produce an HTML page with a message.
2. hello.jsp is a JSP file that contains HTML and could contain Java code snippets for dynamic content generation.
5. When to use?
- Use Servlets when you have complex Java code that interacts with a database and performs some processing, and you need complete control over the content generation.
- Use JSP when you want to separate the presentation from the business logic and have web designers work on the application without the need to understand Java code.
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