📄 simplesession.jsp
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<!-- Copyright (c) 1999-2002 by BEA Systems, Inc. All Rights Reserved.-->
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<title>Simple Session</title>
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<h3>Simple Session</h3>
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<%@ page import="
import javax.naming.Context;
import javax.naming.InitialContext;
import weblogic.management.MBeanHome;
" %>
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<p>
This JSP shows simple principles of session management
by incrementing a counter each time a user accesses a page.
<p>
<%!
private int totalHits = 0;
String serverName;
String failoverMessage="";
private String getServerName() {
String toReturn = null;
try {
Context myCtx = new InitialContext();
MBeanHome mbeanHome = (MBeanHome)myCtx.lookup("weblogic.management.home.localhome");
toReturn=mbeanHome.getMBeanServer().getServerName();
if (toReturn == null) {
return "";
} else {
return toReturn;
}
}
catch (Exception e) {
return "";
}
}
%>
<%
session = request.getSession(true);
Integer ival = (Integer)session.getAttribute("simplesession.counter");
if (ival == null)
ival = new Integer(1);
else
ival = new Integer(ival.intValue() + 1);
session.setAttribute("simplesession.counter", ival);
%>
<%
serverName = getServerName();
String s = (String) session.getAttribute("simplesession.servername");
if (s != null)
if (s.equals(serverName)) {
failoverMessage = "";
} else {
failoverMessage = "(failing over from server" + s + ")";
}
session.setAttribute("simplesession.servername", serverName);
%>
<%
Integer cnt = (Integer)application.getAttribute("simplesession.hitcount");
if (cnt == null)
cnt = new Integer(1);
else
cnt = new Integer(cnt.intValue() + 1);
application.setAttribute("simplesession.hitcount", cnt);
%>
<table border=1 cellpadding=6>
<tr><td width=100% valign=top>
The server currently hosting this session is <B><%= serverName %><B><%= failoverMessage %>
</td>
</tr>
<tr><td width=50% valign=top>
<font face="Helvetica">
<h3>
You have hit this page <font color=red> <%= ival %></font> time<%= (ival.intValue() == 1) ? "" : "s" %>, <br>before the session times out.
</h3>
The value in <font color=red><b>red</b></font> is stored in the HTTP session (<font face="Courier New" size=-1>javax.servlet.http.HttpSession</font>), in an object named <font face="Courier New" size=-1>simplesession.counter</font>. This object has <i>session</i> scope and its integer value is re-set to <font color=red><b>1</b></font> when you reload the page after the session has timed out.
<p>
You can change the time interval after which a session times out. For more information, see the <a href= http://e-docs.bea.com/wls/docs70/webapp/sessions.html#session-timeout>Session Timeout</a> section under <a href= http://e-docs.bea.com/wls/docs70/webapp/sessions.html>Using Sessions And Session Persistence in Web Applications</a>.
</font></td>
<td width=50% valign=top><font face="Helvetica">
<h3>You have hit this page a total of <font color=green> <%= cnt %></font> time<%= (cnt.intValue() == 1) ? "" : "s" %>!
</h3>
The value in <font color=green><b>green</b></font> is stored in the
Servlet Context (<font face="Courier New" size=-1>javax.servlet.ServletContext)</font>, in an object named <font face="Courier New" size=-1>simplesession.hitcount</font>. This object
has <i>application</i> scope and its integer value is incremented each time you
reload the page.
</font>
</td>
</tr></table>
</td>
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<p class="copyright">Last updated: March 2002</p>
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