The Session Object in JSP
By: Sathya Narayana in JSP Tutorials on 2010-10-24
Session object in JSP provides a way to maintain state information across multiple requests made by the same client. It is an instance of the
HttpSession class and can be obtained using the
Session object provides a number of methods to manage session information. Some of the commonly used methods are:
setAttribute(String name, Object value): Sets the value of an attribute with the specified name in the session.
getAttribute(String name): Returns the value of the attribute with the specified name in the session.
removeAttribute(String name): Removes the attribute with the specified name from the session.
invalidate(): Invalidates the session, removing all attributes and ending the session.
Here's an example of how to use the
Session object in a JSP:
<%@ page import="javax.servlet.http.HttpSession" %> <% // Get the session object HttpSession session = request.getSession(); // Set an attribute in the session session.setAttribute("username", "john"); // Get an attribute from the session String username = (String) session.getAttribute("username"); // Remove an attribute from the session session.removeAttribute("username"); // Invalidate the session session.invalidate(); %>
In this example, we first obtain the
Session object using the
request.getSession() method. We then set an attribute named "username" in the session using the
setAttribute() method, and retrieve its value using the
getAttribute() method. We also remove the attribute using the
removeAttribute() method and invalidate the session using the
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