import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* Hello World! servlet with visit counter and updater
*/
public class VisitCountUpdate extends HttpServlet
{
// Number of times the servlet has been executed since
// the program (web server) started
private int visits=0;
/**
* Respond to any HTTP GET request with an
* HTML Hello World! page with visit counter.
*/
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// Set the HTTP content type in response header
response.setContentType("text/html; charset=\"UTF-8\"");
// Turn caching off so that browser will re-visit us
// when a POST occurs (works around IE6 problem)
response.setHeader("Cache-Control", "no-cache");
// Obtain a PrintWriter object for creating the body
// of the response
PrintWriter servletOut = response.getWriter();
// Compute the number of visits to the URL for this servlet
visits++;
// Create the body of the response, including visit count
servletOut.println(
" \n" +
" \n" +
" \n" +
" \n" +
" VisitCountUpdate.java \n" +
" \n" +
" \n" +
" \n" +
" \n" +
" \n" +
" \n" +
" Hello World! \n" +
"
\n" +
" \n" +
" This page has been viewed \n" +
" " + visits + " \n" +
" times since the most recent server restart. \n" +
"
\n" +
" \n" +
" ");
servletOut.close();
}
/**
* Respond to any HTTP POST request with an
* XML document containing the current visit count.
*/
public void doPost (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// Set the HTTP content type in response header
response.setContentType("application/xml; charset=\"UTF-8\"");
// Obtain a PrintWriter object for creating the body
// of the response
PrintWriter servletOut = response.getWriter();
// Output the count
servletOut.println(
" \n" +
"" + visits + "");
servletOut.close();
}
}