Interface HttpSession


Package javax.servlet.http

public interface HttpSession

The servlet container uses this interface to create a session between an HTTP client and an HTTP server. The session persists for a specified time period, across more than one connection or page request from the user.
A session usually corresponds to one user, who may visit a site many times. The server can maintain a session in many ways such as using cookies or rewriting URLs.


This interface allows servlets to

• View and manipulate information about a session, such as the session identifier, creation time, and last accessed time
• Bind objects to sessions, allowing user information to persist across multiple user connections

When an application stores an object in or removes an object from a session, the session checks whether the object implements HttpSessionBindingListener. If it does, the servlet notifies the object that it has been bound to or unbound from the session.

Notifications are sent after the binding methods complete. For session that are invalidated or expire, notifications are sent after the session has been invalidated or expired.

A servlet should be able to handle cases in which the client does not choose to join a session, such as when cookies are intentionally turned off. Until the client joins the session, isNew returns true.
If the client chooses not to join the session, getSession will return a different session on each request, and isNew will always return true.

Session information is scoped only to the current web application (ServletContext), so information stored in one context will not be directly visible in another.




Interface HttpSession Method

Method Summary
java.lang.ObjectgetAttribute(java.lang.String name)
Returns the object bound with the specified name in this session, or null if no object is bound under the name.
java.util.EnumerationgetAttributeNames()
Returns an Enumeration of String objects containing the names of all the objects bound to this session.
longgetCreationTime()
Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.
java.lang.StringgetId()
Returns a string containing the unique identifier assigned to this session.
longgetLastAccessedTime()
Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT, and marked by the time the container received the request.
intgetMaxInactiveInterval()
Returns the maximum time interval, in seconds, that the servlet container will keep this session open between client accesses.
ServletContextgetServletContext()
Returns the ServletContext to which this session belongs.
HttpSessionContextgetSessionContext()
Deprecated. As of Version 2.1, this method is deprecated and has no replacement. It will be removed in a future version of the Java Servlet API.
java.lang.ObjectgetValue(java.lang.String name)
Deprecated. As of Version 2.2, this method is replaced by getAttribute(java.lang.String).
java.lang.String[]getValueNames()
Deprecated. As of Version 2.2, this method is replaced by getAttributeNames()


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