// From "Professional Java Server Programming", Patzer et al.,
// Edition J2EE, Ch 9, pg 406
// Import Servlet Libraries
import javax.servlet.*;
import javax.servlet.http.*;
// Import Java Libraries
import java.io.*;
import java.util.Enumeration;
public class AttributeServlet extends HttpServlet
{
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
// Get session object
HttpSession session = request.getSession ();
String name = request.getParameter ("attrib_name");
String value = request.getParameter ("attrib_value");
String remove = request.getParameter ("attrib_remove");
if (remove != null && remove.equals ("on"))
{
session.removeAttribute (name);
}
else
{
if (name != null && name.length() >0 &&
value != null && value.length() >0)
{
session.setAttribute (name, value);
}
}
response.setContentType ("text/html");
PrintWriter out = response.getWriter ();
out.println ("");
// no-cache lets the page reload by clicking on the reload link
out.println ("");
out.println ("");
out.println (" Session Lifecycle");
out.println ("");
out.println ("");
out.println ("");
out.println ("Session Attributes
");
out.println ("Enter name and value of an attribute");
// String url = response.encodeURL ("offutt/servlet/AttributeServlet");
String url = response.encodeURL ("AttributeServlet");
out.println ("");
out.println ("
");
out.println ("Attributes in this Session:");
Enumeration e = session.getAttributeNames();
while (e.hasMoreElements())
{
String att_name = (String) e.nextElement();
String att_value = (String) session.getAttribute (att_name);
out.print ("
Name: ");
out.println (att_name);
out.print ("
Value: ");
out.println (att_value);
} //end while
out.println ("");
out.println ("");
out.close();
} // End doGet
} //End SessionLifeCycle