Example: SessionSample.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionSample extends HttpServlet {
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Step 1: Get the Session object
boolean create = true;
HttpSession session = request.getSession(create);
// Step 2: Get the session data value
Integer ival = (Integer) session.getValue ("sessiontest.counter");
if (ival == null) {
ival = new Integer (1);
}
else {
ival = new Integer(ival.intValue () + 1);
}
session.putValue ("sessiontest.counter", ival);
// Step 3: Output the page
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Session Tracking Test</title></head>");
out.println("<body>");
out.println("<h1>Session Tracking Test</h1>");
out.println("You have hit this page " + ival + " times" + "<br>");
out.println("Your " + request.getHeader("Cookie"));
out.println("</body></html>");
}
}