import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public final class SessionAuthServlet extends HttpServlet
{
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
sendPage(req, res, req.getSession(false));
}
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
if(req.getParameter("login") != null)
{
HttpSession session = req.getSession(true);
String name = req.getParameter("name");
if(name == null || name.length()==0) name = "Anonymous";
session.putValue("name", name);
sendPage(req, res, session);
}
else
{
HttpSession session = req.getSession(false);
if(session != null) session.invalidate();
sendPage(req, res, null);
}
}
private void sendPage(HttpServletRequest req, HttpServletResponse res,
HttpSession session)
throws ServletException, IOException
{
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter o = res.getWriter();
o.print("SessionAuthServlet");
if(session == null)
o.print("");
else
o.print("Hi " + session.getValue("name") +
"