Difference between Servlet and JSP

In brief, it can be defined as Servlet are the java programs that run on a Web server and act as a middle layer between a request coming from HTTP client and databases or applications on the HTTP server.While JSP is simply a text document that contains two types of text: static text which is predefined and dynamic text which is rendered after server response is received.

The following are the important differences between ArrayList and HashSet.

Sr. No.	Key	Servlet	JSP
1	Implementation	Servlet is developed on Java language.	JSP is primarily written in HTML language although Java code could also be written on it but for it, JSTL or other language is required.
2	MVC	In contrast to MVC we can state servlet as a controller which receives the request process and send back the response.	On the other hand, JSP plays the role of view to render the response returned by the servlet.
3	Request type	Servlets can accept and process all type of protocol requests.	JSP on the other hand is compatible with HTTP request only.
4	Session Management	In Servlet by default session management is not enabled, the user has to enable it explicitly.	On the other hand in JSP session management is automatically enabled.
5	Performance	Servlet is faster than JSP.	JSP is slower than Servlet because first the translation of JSP to java code is taking place and then compiles.
6	Modification reflected	Modification in Servlet is a time-consuming task because it includes reloading, recompiling and restarting the server as we made any change in our code to get reflected.	On the other hands JSP modification is fast as just need to click the refresh button and code change would get reflected.

Example of Servlet

JavaTester.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class JavaTester extends HttpServlet {
   private String message;
   public void init() throws ServletException {
      // Do required initialization
      message = "Hello World";
   }
   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(message);
   }
}