Listing 4 -

Counting Up

Listing 4. The second class in our page counter application is PageCounterServlet. Every time PageCounterServlet is requested, it increments the value of pageCounter.

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

public class PageCounterServlet 
   extends HttpServlet {

   public void doGet(HttpServletRequest request, 
   HttpServletResponse response) throws 
   ServletException, IOException {
      response.setContentType("text/html");
      PrintWriter out = response.getWriter();
      out.println("<HTML>");
      out.println("<HEAD>");
      out.println("<TITLE>Page Counter</TITLE>");
      out.println("</HEAD>");
      out.println("<BODY>");
      ServletContext servletContext = 
         getServletContext();
      int pageCounter = Integer.parseInt((
         String) servletContext.getAttribute(
         "pageCounter"));
      pageCounter++;
      out.println("You are visitor number " + 
         pageCounter);
      servletContext.setAttribute("pageCounter", 
         Integer.toString(pageCounter));

      out.println("</BODY>");
      out.println("</HTML>");
   }
}