Java Servlets :

A programs that run on a Web and Application server is callled Java servelts which is act as a middle layer between a request coming from a Web browser or other HTTP client and Database. we can directly collect input from users through web page forms by using servlet 

- Common Gateway Interface (CGI). 

- Performance is significantly better. 

- Servlets execute within Web server space. 

- Its security test is good and its having independent platform. 

import java.io.*; 
import javax.servlet.*;
import javax.servlet.http.*;

// Extend HttpServlet class
public class HelloWorld extends HttpServlet {
   private String message;
   public void init() throws ServletException {
      // Do required initialization
      message = "Mindstick";
   }
   public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
      // Set response content type
      response.setContentType("text/html");
      // Actual logic goes here.
PrintWriter out = response.getWriter();
      out.println("<h1>" + message + "</h1>");
   }
public void destroy() {
      // do nothing.
   }
}