PortletSession - JBOSS Portal 2.2 API 英文版文档

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javax.portlet
Interface PortletSession

All Known Implementing Classes:: PortletSessionImpl

public interface PortletSession

The PortletSession interface provides a way to identify a user across more than one request and to store transient information about that user.

A PortletSession is created per user client per portlet application.

A portlet can bind an object attribute into a PortletSession by name. The PortletSession interface defines two scopes for storing objects:

APPLICATION_SCOPE
PORTLET_SCOPE

All objects stored in the session using the APPLICATION_SCOPE must be available to all the portlets, servlets and JSPs that belongs to the same portlet application and that handles a request identified as being a part of the same session. Objects stored in the session using the PORTLET_SCOPE must be available to the portlet during requests for the same portlet window that the objects where stored from. Attributes stored in the PORTLET_SCOPE are not protected from other web components of the portlet application. They are just conveniently namespaced.

The portlet session is based on the HttpSession. Therefore all HttpSession listeners do apply to the portlet session and attributes set in the portlet session are visible in the HttpSession and vice versa.

Field Summary

static int APPLICATION_SCOPE
          This constant defines an application wide scope for the session attribute.

static int PORTLET_SCOPE
          This constant defines the scope of the session attribute to be private to the portlet and its included resources.

Method Summary

java.lang.Object getAttribute(java.lang.String name)
          Returns the object bound with the specified name in this session under the PORTLET_SCOPE, or null if no object is bound under the name in that scope.

java.lang.Object getAttribute(java.lang.String name, int scope)
          Returns the object bound with the specified name in this session, or null if no object is bound under the name in the given scope.

java.util.Enumeration getAttributeNames()
          Returns an Enumeration of String objects containing the names of all the objects bound to this session under the PORTLET_SCOPE, or an empty Enumeration if no attributes are available.

java.util.Enumeration getAttributeNames(int scope)
          Returns an Enumeration of String objects containing the names of all the objects bound to this session in the given scope, or an empty Enumeration if no attributes are available in the given scope.

long getCreationTime()
          Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.

java.lang.String getId()
          Returns a string containing the unique identifier assigned to this session.

long getLastAccessedTime()
          Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT.

int getMaxInactiveInterval()
          Returns the maximum time interval, in seconds, for which the portlet container keeps this session open between client accesses.

PortletContext getPortletContext()
          Returns the portlet application context associated with this session.

void invalidate()
          Invalidates this session (all scopes) and unbinds any objects bound to it.

boolean isNew()
          Returns true if the client does not yet know about the session or if the client chooses not to join the session.

void removeAttribute(java.lang.String name)
          Removes the object bound with the specified name under the PORTLET_SCOPE from this session.

void removeAttribute(java.lang.String name, int scope)
          Removes the object bound with the specified name and the given scope from this session.

void setAttribute(java.lang.String name, java.lang.Object value)
          Binds an object to this session under the PORTLET_SCOPE, using the name specified.

void setAttribute(java.lang.String name, java.lang.Object value, int scope)
          Binds an object to this session in the given scope, using the name specified.

void setMaxInactiveInterval(int interval)
          Specifies the time, in seconds, between client requests, before the portlet container invalidates this session.

Field Detail

APPLICATION_SCOPE

public static final int APPLICATION_SCOPE

This constant defines an application wide scope for the session attribute. APPLICATION_SCOPE session attributes enable Portlets within one portlet application to share data.

Portlets may need to prefix attributes set in this scope with some ID, to avoid overwriting each other's attributes in the case where two portlets of the same portlet definition are created.

Value: 0x01

See Also:: Constant Field Values

PORTLET_SCOPE

public static final int PORTLET_SCOPE

This constant defines the scope of the session attribute to be private to the portlet and its included resources.

Value: 0x02

See Also:: Constant Field Values

Method Detail

getAttribute

public java.lang.Object getAttribute(java.lang.String name)
                              throws java.lang.IllegalStateException,
                                     java.lang.IllegalArgumentException

Returns the object bound with the specified name in this session under the PORTLET_SCOPE, or null if no object is bound under the name in that scope.

Parameters:: name - a string specifying the name of the object
Returns:: the object with the specified name for the PORTLET_SCOPE.
Throws:: java.lang.IllegalStateException - if this method is called on an invalidated session.; java.lang.IllegalArgumentException - if name is null.

getAttribute

public java.lang.Object getAttribute(java.lang.String name,
                                     int scope)
                              throws java.lang.IllegalStateException,
                                     java.lang.IllegalArgumentException

Returns the object bound with the specified name in this session, or null if no object is bound under the name in the given scope.

Parameters:: name - a string specifying the name of the object; scope - session scope of this attribute
Returns:: the object with the specified name
Throws:: java.lang.IllegalStateException - if this method is called on an invalidated session; java.lang.IllegalArgumentException - if name is null.

getAttributeNames

public java.util.Enumeration getAttributeNames()
                                        throws java.lang.IllegalStateException

Returns an Enumeration of String objects containing the names of all the objects bound to this session under the PORTLET_SCOPE, or an empty Enumeration if no attributes are available.

Returns:: an Enumeration of String objects specifying the names of all the objects bound to this session, or an empty Enumeration if no attributes are available.
Throws:: java.lang.IllegalStateException - if this method is called on an invalidated session

getAttributeNames

public java.util.Enumeration getAttributeNames(int scope)
                                        throws java.lang.IllegalStateException

Returns an Enumeration of String objects containing the names of all the objects bound to this session in the given scope, or an empty Enumeration if no attributes are available in the given scope.

Parameters:: scope - session scope of the attribute names
Returns:: an Enumeration of String objects specifying the names of all the objects bound to this session, or an empty Enumeration if no attributes are available in the given scope.
Throws:: java.lang.IllegalStateException - if this method is called on an invalidated session

getCreationTime

public long getCreationTime()
                     throws java.lang.IllegalStateException

Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.

Returns:: a long specifying when this session was created, expressed in milliseconds since 1/1/1970 GMT
Throws:: java.lang.IllegalStateException - if this method is called on an invalidated session

getId

public java.lang.String getId()

Returns a string containing the unique identifier assigned to this session.

Returns:: a string specifying the identifier assigned to this session

getLastAccessedTime

public long getLastAccessedTime()

Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT.

Actions that your portlet takes, such as getting or setting a value associated with the session, do not affect the access time.

Returns:: a long representing the last time the client sent a request associated with this session, expressed in milliseconds since 1/1/1970 GMT

getMaxInactiveInterval

public int getMaxInactiveInterval()

Returns the maximum time interval, in seconds, for which the portlet container keeps this session open between client accesses. After this interval, the portlet container invalidates the session. The maximum time interval can be set with the setMaxInactiveInterval method. A negative time indicates the session should never timeout.

Returns:: an integer specifying the number of seconds this session remains open between client requests
See Also:: setMaxInactiveInterval(int)

getPortletContext

public PortletContext getPortletContext()

Returns the portlet application context associated with this session.

Returns:: the portlet application context

invalidate

public void invalidate()
                throws java.lang.IllegalStateException

Invalidates this session (all scopes) and unbinds any objects bound to it.

Invalidating the portlet session will result in invalidating the underlying HttpSession

Throws:: java.lang.IllegalStateException - if this method is called on a session which has already been invalidated

isNew

public boolean isNew()
              throws java.lang.IllegalStateException

Returns true if the client does not yet know about the session or if the client chooses not to join the session.

Returns:: true if the server has created a session, but the client has not joined yet.
Throws:: java.lang.IllegalStateException - if this method is called on a session which has already been invalidated

removeAttribute

public void removeAttribute(java.lang.String name)
                     throws java.lang.IllegalStateException,
                            java.lang.IllegalArgumentException

Removes the object bound with the specified name under the PORTLET_SCOPE from this session. If the session does not have an object bound with the specified name, this method does nothing.

Parameters:: name - the name of the object to be removed from this session in the PORTLET_SCOPE.
Throws:: java.lang.IllegalStateException - if this method is called on a session which has been invalidated; java.lang.IllegalArgumentException - if name is null.

removeAttribute

public void removeAttribute(java.lang.String name,
                            int scope)
                     throws java.lang.IllegalStateException,
                            java.lang.IllegalArgumentException

Removes the object bound with the specified name and the given scope from this session. If the session does not have an object bound with the specified name, this method does nothing.

Parameters:: name - the name of the object to be removed from this session; scope - session scope of this attribute
Throws:: java.lang.IllegalStateException - if this method is called on a session which has been invalidated; java.lang.IllegalArgumentException - if name is null.

setAttribute

public void setAttribute(java.lang.String name,
                         java.lang.Object value)
                  throws java.lang.IllegalStateException,
                         java.lang.IllegalArgumentException

Binds an object to this session under the PORTLET_SCOPE, using the name specified. If an object of the same name in this scope is already bound to the session, that object is replaced.

After this method has been executed, and if the new object implements HttpSessionBindingListener, the container calls HttpSessionBindingListener.valueBound. The container then notifies any HttpSessionAttributeListeners in the web application.

If an object was already bound to this session that implements HttpSessionBindingListener, its HttpSessionBindingListener.valueUnbound method is called.

If the value is null, this has the same effect as calling removeAttribute().

Parameters:: name - the name to which the object is bound under the PORTLET_SCOPE; this cannot be null.; value - the object to be bound
Throws:: java.lang.IllegalStateException - if this method is called on a session which has been invalidated; java.lang.IllegalArgumentException - if name is null.

setAttribute

public void setAttribute(java.lang.String name,
                         java.lang.Object value,
                         int scope)
                  throws java.lang.IllegalStateException,
                         java.lang.IllegalArgumentException

Binds an object to this session in the given scope, using the name specified. If an object of the same name in this scope is already bound to the session, that object is replaced.

If an object was already bound to this session that implements HttpSessionBindingListener, its HttpSessionBindingListener.valueUnbound method is called.

If the value is null, this has the same effect as calling removeAttribute().

Parameters:: name - the name to which the object is bound; this cannot be null.; value - the object to be bound; scope - session scope of this attribute
Throws:: java.lang.IllegalStateException - if this method is called on a session which has been invalidated; java.lang.IllegalArgumentException - if name is null.

setMaxInactiveInterval

public void setMaxInactiveInterval(int interval)

Specifies the time, in seconds, between client requests, before the portlet container invalidates this session. A negative time indicates the session should never timeout.

Parameters:: interval - An integer specifying the number of seconds

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Field Summary
`static int`	`APPLICATION_SCOPE` This constant defines an application wide scope for the session attribute.
`static int`	`PORTLET_SCOPE` This constant defines the scope of the session attribute to be private to the portlet and its included resources.

Method Summary
`java.lang.Object`	`getAttribute(java.lang.String name)` Returns the object bound with the specified name in this session under the `PORTLET_SCOPE`, or `null` if no object is bound under the name in that scope.
`java.lang.Object`	`getAttribute(java.lang.String name, int scope)` Returns the object bound with the specified name in this session, or `null` if no object is bound under the name in the given scope.
`java.util.Enumeration`	`getAttributeNames()` Returns an `Enumeration` of String objects containing the names of all the objects bound to this session under the `PORTLET_SCOPE`, or an empty `Enumeration` if no attributes are available.
`java.util.Enumeration`	`getAttributeNames(int scope)` Returns an `Enumeration` of String objects containing the names of all the objects bound to this session in the given scope, or an empty `Enumeration` if no attributes are available in the given scope.
`long`	`getCreationTime()` Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.
`java.lang.String`	`getId()` Returns a string containing the unique identifier assigned to this session.
`long`	`getLastAccessedTime()` Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT.
`int`	`getMaxInactiveInterval()` Returns the maximum time interval, in seconds, for which the portlet container keeps this session open between client accesses.
`PortletContext`	`getPortletContext()` Returns the portlet application context associated with this session.
`void`	`invalidate()` Invalidates this session (all scopes) and unbinds any objects bound to it.
`boolean`	`isNew()` Returns true if the client does not yet know about the session or if the client chooses not to join the session.
`void`	`removeAttribute(java.lang.String name)` Removes the object bound with the specified name under the `PORTLET_SCOPE` from this session.
`void`	`removeAttribute(java.lang.String name, int scope)` Removes the object bound with the specified name and the given scope from this session.
`void`	`setAttribute(java.lang.String name, java.lang.Object value)` Binds an object to this session under the `PORTLET_SCOPE`, using the name specified.
`void`	`setAttribute(java.lang.String name, java.lang.Object value, int scope)` Binds an object to this session in the given scope, using the name specified.
`void`	`setMaxInactiveInterval(int interval)` Specifies the time, in seconds, between client requests, before the portlet container invalidates this session.

PortletSession - JBOSS Portal 2.2 API 英文版文档

javax.portlet Interface PortletSession

APPLICATION_SCOPE

PORTLET_SCOPE

getAttribute

getAttribute

getAttributeNames

getAttributeNames

getCreationTime

getId

getLastAccessedTime

getMaxInactiveInterval

getPortletContext

invalidate

isNew

removeAttribute

removeAttribute

setAttribute

setAttribute

setMaxInactiveInterval

javax.portlet
Interface PortletSession