HttpSessionBindingEvent (Java EE 5)

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javax.servlet.http Class HttpSessionBindingEvent

java.lang.Object
  java.util.EventObject
      javax.servlet.http.HttpSessionEvent
          javax.servlet.http.HttpSessionBindingEvent

All Implemented Interfaces:: Serializable

public class HttpSessionBindingEvent
extends HttpSessionEvent

Extends: java.util.EventObject > HttpSessionEvent

这种类型的事件将发送到绑定到会话或从会话中取消绑定时实现 HttpSessionBindingListener 的对象，或者发送到绑定、取消绑定或替换会话中的任何属性时已在部署描述符中配置好的 HttpSessionAttributeListener。

会话通过调用 HttpSession.setAttribute 绑定对象，通过调用 HttpSession.removeAttribute 取消绑定对象。

英文文档：

Events of this type are either sent to an object that implements HttpSessionBindingListener when it is bound or unbound from a session, or to a HttpSessionAttributeListener that has been configured in the deployment descriptor when any attribute is bound, unbound or replaced in a session.

The session binds the object by a call to HttpSession.setAttribute and unbinds the object by a call to HttpSession.removeAttribute.

Author:: Various
See Also:: HttpSession, HttpSessionBindingListener, HttpSessionAttributeListener, Serialized Form

Field Summary

Fields inherited from class java.util.EventObject
`source`

Constructor Summary
`HttpSessionBindingEvent(HttpSession session, String name)` Constructs an event that notifies an object that it has been bound to or unbound from a session.
`HttpSessionBindingEvent(HttpSession session, String name, Object value)` Constructs an event that notifies an object that it has been bound to or unbound from a session.

Method Summary
`String`	`getName()` Returns the name with which the attribute is bound to or unbound from the session.
`HttpSession`	`getSession()` Return the session that changed.
`Object`	`getValue()` Returns the value of the attribute that has been added, removed or replaced.

Methods inherited from class java.util.EventObject
`getSource, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

public HttpSessionBindingEvent(HttpSession session, String name)
构造一个事件，通知对象它已经被绑定到会话，或者已经从会话中取消了对它的绑定。要接收该事件，对象必须实现 `HttpSessionBindingListener`。

session 将对象绑定到或从中取消绑定的会话

name 用来绑定或取消绑定对象的名称

See also getName, getSession

英文文档：
HttpSessionBindingEvent

public HttpSessionBindingEvent(HttpSession session,
                               String name)

Constructs an event that notifies an object that it has been bound to or unbound from a session. To receive the event, the object must implement HttpSessionBindingListener.

Parameters:: session - the session to which the object is bound or unbound; name - the name with which the object is bound or unbound
See Also:: getName(), getSession()

public HttpSessionBindingEvent(HttpSession session, String name, Object value)
构造一个事件，通知对象它已经被绑定到会话，或者已经从会话中取消了对它的绑定。要接收该事件，对象必须实现 `HttpSessionBindingListener`。

session 将对象绑定到或从中取消绑定的会话

name 用来绑定或取消绑定对象的名称

See also getName, getSession

英文文档：
HttpSessionBindingEvent

public HttpSessionBindingEvent(HttpSession session,
                               String name,
                               Object value)

Constructs an event that notifies an object that it has been bound to or unbound from a session. To receive the event, the object must implement HttpSessionBindingListener.

Parameters:: session - the session to which the object is bound or unbound; name - the name with which the object is bound or unbound
See Also:: getName(), getSession()

Method Detail

public HttpSession getSession()
返回更改的会话。

英文文档：
getSession

public HttpSession getSession()

Return the session that changed.

Overrides:: getSession in class HttpSessionEvent

public String getName()
返回用来将属性绑定到会话或从会话中取消属性绑定的名称。

return 指定用来将对象绑定到会话或从会话中取消绑定对象的名称的字符串

英文文档：
getName

public String getName()

Returns the name with which the attribute is bound to or unbound from the session.

Returns:: a string specifying the name with which the object is bound to or unbound from the session

public Object getValue()
返回已添加、移除或替换的属性的值。如果添加（或绑定）了属性，则这是该属性的值。如果移除（或取消绑定）了属性，则这是被移除属性的值。如果替换了属性，则这是属性原来的值。

since 2.3

英文文档：
getValue

public Object getValue()

Returns the value of the attribute that has been added, removed or replaced. If the attribute was added (or bound), this is the value of the attribute. If the attribute was removed (or unbound), this is the value of the removed attribute. If the attribute was replaced, this is the old value of the attribute.