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JSP Session Parameter rewrite
In the section you will study about the session parameter in jsp.
JSP session provides methods like getCreationtime(), getLastAccessedTime(),
getId(), invalidate(), getMaxInactiveInterval(), setMaxInactiveInterval(),
removeAttribute(String name) and setAttribute(String, object) which
will provide the session information.
The getCreationTime() method of session object returns the
session created time in milliseconds. The getLastAccessedTime()
method returns the latest time of the client request in milliseconds. The getId() method
returns current session identifier. The invalidate() method discards the session. The getMaxInactiveInterval() method
returns
the maximum amount of time the session can be inactive before
it is deleted. The setMaxInactiveInterval() method is used to set the time
out for each session. removeAttribute() method is used to remove the
attribute and value from the session. The setAttribute() method is used to
set the attribute and the value to the session. Here is an example which
illustrates you how to show session parameters in jsp.
Here is the code of sessionParameter.jsp
<%@ page import="java.util.*" %>
<%
Date lastVisit = (Date)session.getAttribute("lastVisit");
Date thisVisit = new Date();
%>
<html>
<head>
<title>JSP Session Parameter Rewrite</title>
</head>
<body>
Last visit: <%= lastVisit %><br>
This visit: <%= thisVisit %><br>
Session ID: <%= session.getId() %><br>
Session max interval: <%= session.getMaxInactiveInterval() %><br>
<h2>Use Session parameter</h2>
<%
Enumeration enumeration = session.getAttributeNames();
while (enumeration.hasMoreElements()) {
String visit = (String) enumeration.nextElement();
out.println(""+visit+"="+
session.getAttribute(visit)+"<br>");
}
session.setAttribute("lastVisit",thisVisit);
session.setMaxInactiveInterval(600);
%>
</body>
</html> |
In the above example, we have passed the variable 'visit' of string type in the
getAttribute() method and we are passing the parameters 'lastVisit' and 'thisVisit'
with setAttribute("lastVisit",thisVisit) method. The
session.setMaxInactiveInterval(600) method set the session's interval, after
which session gets deleted if it remains inactive in between.
Output will be displayed as:
After refreshing the browser, the output will be:
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