Get session from request
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class Counter extends HttpServlet {
static final String COUNTER_KEY = "Counter.count";
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
IOException {
HttpSession session = req.getSession(true);
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
int count = 1;
Integer i = (Integer) session.getAttribute(COUNTER_KEY);
if (i != null) {
count = i.intValue() + 1;
}
session.setAttribute(COUNTER_KEY, new Integer(count));
out.println("<html>");
out.println("<head>");
out.println("<title>Session Counter</title>");
out.println("</head>");
out.println("<body>");
out.println("Your session ID is <b>" + session.getId());
out.println("</b> and you have hit this page <b>" + count
+ "</b> time(s) during this browser session");
out.println("<form method=GET action=\"" + req.getRequestURI() + "\">");
out.println("<input type=submit " + "value=\"Hit page again\">");
out.println("</form>");
out.println("</body>");
out.println("</html>");
out.flush();
}
}
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