import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
/**
* The URLSessionServlet demonstrates how the servlet API
* makes it easy to use rewritten URLs for session
* management rather than cookies.
*
* @author Dustin R. Callaway
* @version 1.0, 08/08/98
*/
public class URLSessionServlet extends HttpServlet
{
/**
* init method is called when servlet is first loaded.
*/
public void init(ServletConfig config) throws ServletException
{
super.init(config); //pass ServletConfig to parent
}
/**
* service uses session object to track the number of times
* each user has requested this servlet.
*/
public void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException
{
//get current session or, if necessary, create a new one
HttpSession mySession = request.getSession(true);
//get hit count from session
Integer count = (Integer)mySession.getValue("hitCounter");
if (count == null) //hitCounter value not in session
{
count = new Integer(1); //start hit count at 1
}
else //session contains hitCounter
{
//increment hit counter
count = new Integer(count.intValue() + 1);
}
//store hit count in session
mySession.putValue("hitCounter", count);
//MIME type to return is HTML
response.setContentType("text/html");
//get a handle to the output stream
PrintWriter out = response.getWriter();
//generate HTML document to send to client
out.println("");
out.println("");
out.println("Sessions with URLs");
out.println("");
out.println("");
out.println("You have visited this page " + count +
" times.");
out.println("Click here to load page again.");
out.println("");
out.println("");
out.close(); //close output stream
}
/**
* getServletInfo returns a brief description of this servlet
*/
public String getServletInfo()
{
return "Manages session with rewritten URLs.";
}
}