3 question about cookie and session please.

Question

1. I know that session automatic use in JSP by default and save session id in cookie. I have code that show all cookie on my computer
<%
     Cookie [ ] listcookie = request.getCookies();
     Cookie mycookie = null;
     for(int i=0; i<listcookie.length; i++)
          mycookie = listcookie;
          out.println("<tr><td> " + mycookie.getName() + "</td>");
          out.println("<td> " + mycookie.getValue() + "</td></tr>");
%>
When I first run this code it now show cookie. But when I click refresh it show session cookie. Why it not show session cookie at first time?
2. I use tomcat on window. Is session on server is save as file. Which directory it save?
3. I use method getCreationTime() to check first create session time and method session.getLastAccessedTime() to check last access session time. I have to file
showsession1.jsp
first time create is <%=session.getCreationTime()%>  <br>
last time access is <%=session.getLastAccessedTime()%> <br>
<a href="showsession2.jsp"> showsession2.jsp</a>showsession2.jsp
first time create is <%=session.getCreationTime()%>  <br>
last time access is <%=session.getLastAccessedTime()%> <br>When I open browser and run showsession1.jsp first time create and last time access is equal when I click link to showsession2.jsp it also equal. Why it still equal because it is second time that I access JSP file? It change when I refresh file showsession2.jsp

Answer 1

1. When I first run this code it now show cookie. But
when I click refresh it show session cookie. Why it
not show session cookie at first time?
When you first request the JSP, the session cookie does not exist on your PC and so your browser cannot supply it which means that the JSP cannot display it. The session cookie is created when the JSP returns the response to the first request. The browser can then send the cookie on subsequent requests.
2. I use tomcat on window. Is session on server is
save as file. Which directory it save?How the server saves the session info is server dependent and it's unlikely you will be able to view it.
3. I use method getCreationTime() to check first
create session time and method
session.getLastAccessedTime() to check last access
session time. I have to file
showsession1.jsp
When I open browser and run showsession1.jsp first
time create and last time access is equal when I click
link to showsession2.jsp it also equal. Why it still
equal because it is second time that I access JSP
file? It change when I refresh file showsession2.jspProbably showsession2.jsp was already in the browser cache and so there was no request to the server until you refreshed