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APPENDIXES
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JSP: The Complete Reference
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Methods
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getAttribute
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public Object getAttribute(String name)
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Returns the object with the specified name if it exists in the session, or null if it does not
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getAttributeNames
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public Enumeration getAttributeNames()
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Returns an Enumeration of the names of all the objects bound to this session
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getCreationTime
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public long getCreationTime()
Returns the time the session was created in milliseconds from January 1, 1970
getId
public String getId()
Returns the session identifier
getLastAccessedTime
public long getLastAccessedTime()
Returns the time the session was last accessed in milliseconds from January 1, 1970
getMaxInactiveInterval
public int getMaxInactiveInterval()
Returns the maximum number of seconds this session can remain active between requests If the time interval is exceeded, the servlet engine is permitted to terminate it
Appendix A:
Servlet API Version 23
Some servlet engines erroneously treat this value as milliseconds or minutes You should verify this method s operation if you depend on it being correct
[deprecated] getSessionContext
public HttpSessionContext getSessionContext()
No longer supported
[deprecated] getValue
public Object getValue(String name)
No longer supported Use getAttribute(String name) instead
[deprecated] getValueNames
public String getValueNames()
No longer supported Use getAttributeNames() instead
invalidate
public void invalidate()
Closes the session, calling valueUnbound() for any HttpSessionBindingListener objects bound to the session
isNew
public boolean isNew()
Returns true if a session has been created but the client has not yet issued a request with that session ID
APPENDIXES
[deprecated] putValue
public void putValue(String name, Object value)
No longer supported Use setAttribute(String name, Object value) instead
JSP: The Complete Reference
removeAttribute
public void removeAttribute(String name)
Removes a reference to an object in the session with the specified name If the object implements the HttpSessionBindingListener interface, the servlet engine calls its valueUnbound() method Ignored if the specified value does not exist in the session
[deprecated] removeValue
public void removeValue(String name)
No longer supported Use removeAttribute(String name) instead
setAttribute
public void setAttribute(String name, Object value)
Stores a reference to an object in the session under the specified name If the object implements the HttpSessionBindingListener interface, the servlet engine calls its valueBound() method
setMaxInactiveInterval
public void setMaxInactiveInterval(int interval)
Specifies the maximum number of seconds this session can remain active between requests If the time interval is exceeded, the servlet engine is permitted to terminate it Some servlet engines erroneously treat this value as milliseconds or minutes You should verify this method s operation if you depend on it being correct
HttpSessionActivationListener
Full Name: javaxservlethttpHttpSessionActivationListener Type: Interface
Objects can register to receive notification of session activation and passivation events by implementing this interface
Appendix A:
Servlet API Version 23
Methods
sessionDidActivate
public void sessionDidActivate(HttpSessionEvent se)
Will be called when the session has just been activated
sessionWillPassivate
public void sessionWillPassivate(HttpSessionEvent se)
Will be called when the session is about to be passivated
HttpSessionAttributesListener
Full Name: Type: Superinterface: javaxservlethttpHttpSessionAttributesListener Interface javautilEventListener
Objects can register to receive notification of attribute add/remove events by implementing this interface
Methods
attributeAdded
public void attributeAdded(HttpSessionBindingEvent se)
Will be called when an attribute has been added to a session
attributeRemoved
public void attributeRemoved(HttpSessionBindingEvent se) APPENDIXES
Will be called when an attribute has been removed from a session
JSP: The Complete Reference
attributeReplaced
public void attributeReplaced(HttpSessionBindingEvent se)
Will be called when an attribute has been replaced in a session
HttpSessionBindingEvent
Full Name: Type: Extends: javaxservlethttpHttpSessionBindingEvent Class javaxservlethttpHttpSessionEvent
An event object that is passed as a parameter to the valueBound() and valueUnbound() methods of an HttpSessionBindingListener Using methods in the event object, the HttpSessionBindingListener can get the name by which it was bound and a reference to the HttpSession itself
Constructors
HttpSessionBindingEvent
public HttpSessionBindingEvent (HttpSession session, String name)
Creates a new HttpSessionBindingEvent object for the specified session The name parameter indicates the name by which the listening object was bound to the session
HttpSessionBindingEvent
public HttpSessionBindingEvent (HttpSession session, String name, Object value)
Creates a new HttpSessionBindingEvent object for the specified session The name parameter indicates the name by which the listening object was bound to the session, and the value parameter contains its value
Methods
getName
public String getName()
Appendix A:
Servlet API Version 23
Returns the name by which the object is known to the session
getSession
public HttpSession getSession()
Returns the session to which the listener object was bound or unbound
getValue
public Object getValue()
Returns the value of the attribute being added, changed, or deleted
HttpSessionBindingListener
Full Name: Type: javaxservlethttpHttpSessionBindingListener Interface
Superinterface: javautilEventListener Objects that implement this interface are notified when they are bound to or unbound from an HttpSession The object must provide valueBound() and valueUnbound() methods, each of which have a HttpSessionBindingEvent parameter that allows the object to determine its name and the session to which it belongs
Methods
valueBound
public void valueBound(HttpSessionBindingEvent event)
Called when an object is bound to a session
APPENDIXES
valueUnbound
public void valueUnbound(HttpSessionBindingEvent event)
Called when an object is unbound from a session
JSP: The Complete Reference
HttpSessionContext
Full Name: javaxservlethttpHttpSessionContext Type: Interface
Formerly used to allow direct interservlet communication, this class is now deprecated
Methods
[deprecated] getIds
public Enumeration getIds()
No longer supported
[deprecated] getSession
public HttpSession getSession(String sessionId)
No longer supported
HttpSessionEvent
Full Name: javaxservlethttpHttpSessionEvent Type: Extends: Class javautilEventObject
Represents an event notification for changes to sessions in a web application
Constructors
HttpSessionEvent
public HttpSessionEvent(HttpSession source)
Creates a new session event from the specified source
Appendix A:
Servlet API Version 23
Methods
getSession
public HttpSession getSession()
Returns a reference to the session that changed
HttpSessionListener
Full Name: javaxservlethttpHttpSessionListener Type: Interface
Classes that implement HttpSessionListener receive notification when sessions are created or invalidated
Methods
sessionCreated
public void sessionCreated(HttpSessionEvent se)
Called when a new session is created
sessionDestroyed
public void sessionDestroyed(HttpSessionEvent se)
Called when a session is invalidated
HttpUtils
Full Name: Type: javaxservlethttpHttpUtils
APPENDIXES
Class
A utility class providing methods useful in HTTP servlets
JSP: The Complete Reference
Constructors
HttpUtils
public HttpUtils()
Creates a new HttpUtils object
Methods
getRequestURL
public static StringBuffer getRequestURL (HttpServletRequest req)
Returns the entire URL used for the specified request Includes the protocol, server name, port number (if other than the default), and file name Does not include the query string
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