httpsession.html

java API学习JAVA的人必备之品

<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - a string specifying the name of the object
<DT><B>Returns:</B><DD>the object with the specified name
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="getAttributeNames()"><!-- --></A><H3>
getAttributeNames</H3>
<PRE>
public java.util.Enumeration <B>getAttributeNames</B>()</PRE>
<DL>
<DD>Returns an <code>Enumeration</code> of <code>String</code> objects
 containing the names of all the objects bound to this session.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>an <code>Enumeration</code> of 
				<code>String</code> objects specifying the
				names of all the objects bound to
				this session
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="getValueNames()"><!-- --></A><H3>
getValueNames</H3>
<PRE>
public java.lang.String[] <B>getValueNames</B>()</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>As of Version 2.2, this method is
 			replaced by <A HREF="../../../javax/servlet/http/HttpSession.html#getAttributeNames()"><CODE>getAttributeNames()</CODE></A></I>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>an array of <code>String</code>
					objects specifying the
					names of all the objects bound to
					this session
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="setAttribute(java.lang.String, java.lang.Object)"><!-- --></A><H3>
setAttribute</H3>
<PRE>
public void <B>setAttribute</B>(java.lang.String&nbsp;name,
                         java.lang.Object&nbsp;value)</PRE>
<DL>
<DD>Binds an object to this session, using the name specified.
 If an object of the same name is already bound to the session,
 the object is replaced.

 <p>After this method executes, and if the new object
 implements <code>HttpSessionBindingListener</code>,
 the container calls 
 <code>HttpSessionBindingListener.valueBound</code>. The container then   
 notifies any <code>HttpSessionAttributeListener</code>s in the web 
 application.

 <p>If an object was already bound to this session of this name
 that implements <code>HttpSessionBindingListener</code>, its 
 <code>HttpSessionBindingListener.valueUnbound</code> method is called.

 <p>If the value passed in is null, this has the same effect as calling 
 <code>removeAttribute()<code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name to which the object is bound;
					cannot be null<DD><CODE>value</CODE> - the object to be bound
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="putValue(java.lang.String, java.lang.Object)"><!-- --></A><H3>
putValue</H3>
<PRE>
public void <B>putValue</B>(java.lang.String&nbsp;name,
                     java.lang.Object&nbsp;value)</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>As of Version 2.2, this method is
 			replaced by <A HREF="../../../javax/servlet/http/HttpSession.html#setAttribute(java.lang.String, java.lang.Object)"><CODE>setAttribute(java.lang.String, java.lang.Object)</CODE></A></I>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name to which the object is bound;
					cannot be null<DD><CODE>value</CODE> - the object to be bound; cannot be null
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="removeAttribute(java.lang.String)"><!-- --></A><H3>
removeAttribute</H3>
<PRE>
public void <B>removeAttribute</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD>Removes the object bound with the specified name from
 this session. If the session does not have an object
 bound with the specified name, this method does nothing.

 <p>After this method executes, and if the object
 implements <code>HttpSessionBindingListener</code>,
 the container calls 
 <code>HttpSessionBindingListener.valueUnbound</code>. The container
 then notifies any <code>HttpSessionAttributeListener</code>s in the web 
 application.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of the object to
						remove from this session
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="removeValue(java.lang.String)"><!-- --></A><H3>
removeValue</H3>
<PRE>
public void <B>removeValue</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>As of Version 2.2, this method is
 			replaced by <A HREF="../../../javax/servlet/http/HttpSession.html#removeAttribute(java.lang.String)"><CODE>removeAttribute(java.lang.String)</CODE></A></I>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of the object to
						remove from this session
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="invalidate()"><!-- --></A><H3>
invalidate</H3>
<PRE>
public void <B>invalidate</B>()</PRE>
<DL>
<DD>Invalidates this session then unbinds any objects bound
 to it.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					already invalidated session</DL>
</DD>
</DL>
<HR>

<A NAME="isNew()"><!-- --></A><H3>
isNew</H3>
<PRE>
public boolean <B>isNew</B>()</PRE>
<DL>
<DD>Returns <code>true</code> if the client does not yet know about the
 session or if the client chooses not to join the session.  For 
 example, if the server used only cookie-based sessions, and
 the client had disabled the use of cookies, then a session would
 be new on each request.
<P>
<DD><DL>

<DT><B>Returns:</B><DD><code>true</code> if the 
					server has created a session, 
					but the client has not yet joined
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called on an
					already invalidated session</DL>
</DD>
</DL>
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