Creating a servlet to record hits on a web page

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Reference - https://www.tutorialspoint.com/servlets/servlets-hits-counter.htm

The servlet

import java.io.*;
import java.sql.Date;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
public class PageHitCounter extends HttpServlet {
 
   private int hitCount; 
 
   public void init() { 
      // Reset hit counter.
      hitCount = 0;
   } 
 
   public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
 
      // Set response content type
      response.setContentType("text/html");
 
      // This method executes whenever the servlet is hit 
      // increment hitCount 
      hitCount++; 
      PrintWriter out = response.getWriter();
      String title = "Total Number of Hits";
      String docType = "<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
 
      out.println(docType +
         "<html>\n" +
            "<head><title>" + title + "</title></head>\n" +
            "<body bgcolor = \"#f0f0f0\">\n" +
               "<h1 align = \"center\">" + title + "</h1>\n" +
               "<h2 align = \"center\">" + hitCount + "</h2>\n" +
            "</body>
         </html>"
      );
   }
 
   public void destroy() { 
      // This is optional step but if you like you
      // can write hitCount value in your database.
   } 
}

The web.xml 

<servlet>
   <servlet-name>PageHitCounter</servlet-name>
   <servlet-class>PageHitCounter</servlet-class>
</servlet>
 
<servlet-mapping>
   <servlet-name>PageHitCounter</servlet-name>
   <url-pattern>/PageHitCounter</url-pattern>
</servlet-mapping>
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