alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Tomcat example source code file (HttpSession.java)

This example Tomcat source code file (HttpSession.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

enumeration, httpsession, httpsession, httpsessioncontext, object, object, servlet, servletcontext, servletcontext, string, string, util

The Tomcat HttpSession.java source code

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.servlet.http;

import java.util.Enumeration;
import javax.servlet.ServletContext;

/**
 *
 * Provides a way to identify a user across more than one page
 * request or visit to a Web site and to store information about that user.
 *
 * <p>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.
 *
 * <p>This interface allows servlets to 
 * <ul>
 * <li>View and manipulate information about a session, such as
 *     the session identifier, creation time, and last accessed time
 * <li>Bind objects to sessions, allowing user information to persist 
 *     across multiple user connections
 * </ul>
 *
 * <p>When an application stores an object in or removes an object from a
 * session, the session checks whether the object implements
 * {@link 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.
 *
 * <p> When container migrates a session between VMs in a distributed container
 * setting, all session attributes implementing the {@link HttpSessionActivationListener}
 * interface are notified.
 * 
 * <p>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,
 * <code>isNew returns true.  If the client chooses 
 * not to join
 * the session, <code>getSession will return a different session
 * on each request, and <code>isNew will always return
 * <code>true.
 *
 * <p>Session information is scoped only to the current web application
 * (<code>ServletContext), so information stored in one context
 * will not be directly visible in another.
 *
 * @author	Various
 * @version	$Version$
 *
 *
 * @see 	HttpSessionBindingListener
 * @see 	HttpSessionContext
 *
 */

public interface HttpSession {




    /**
     *
     * Returns the time when this session was created, measured
     * in milliseconds since midnight January 1, 1970 GMT.
     *
     * @return				a <code>long specifying
     * 					when this session was created,
     *					expressed in 
     *					milliseconds since 1/1/1970 GMT
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */

    public long getCreationTime();
    
    
    
    
    /**
     *
     * Returns a string containing the unique identifier assigned 
     * to this session. The identifier is assigned 
     * by the servlet container and is implementation dependent.
     * 
     * @return				a string specifying the identifier
     *					assigned to this session
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */

    public String getId();
    
    
    

    /**
     *
     * 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. 
     *
     * <p>Actions that your application takes, such as getting or setting
     * a value associated with the session, do not affect the access
     * time.
     *
     * @return				a <code>long
     *					representing the last time 
     *					the client sent a request associated
     *					with this session, expressed in 
     *					milliseconds since 1/1/1970 GMT
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */

    public long getLastAccessedTime();
    
    
    /**
    * Returns the ServletContext to which this session belongs.
    *    
    * @return The ServletContext object for the web application
    * @since 2.3
    */

    public ServletContext getServletContext();


    /**
     *
     * Specifies the time, in seconds, between client requests before the 
     * servlet container will invalidate this session.  A negative time
     * indicates the session should never timeout.
     *
     * @param interval		An integer specifying the number
     * 				of seconds 
     *
     */
    
    public void setMaxInactiveInterval(int interval);




   /**
    * Returns the maximum time interval, in seconds, that 
    * the servlet container will keep this session open between 
    * client accesses. After this interval, the servlet container
    * will invalidate the session.  The maximum time interval can be set
    * with the <code>setMaxInactiveInterval method.
    * A negative time indicates the session should never timeout.
    *  
    *
    * @return		an integer specifying the number of
    *			seconds this session remains open
    *			between client requests
    *
    * @see		#setMaxInactiveInterval
    *
    *
    */

    public int getMaxInactiveInterval();
    
    


   /**
    *
    * @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.
    *
    */

    public HttpSessionContext getSessionContext();
    
    
    
    
    /**
     *
     * Returns the object bound with the specified name in this session, or
     * <code>null if no object is bound under the name.
     *
     * @param name		a string specifying the name of the object
     *
     * @return			the object with the specified name
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */
  
    public Object getAttribute(String name);
    
    
    
    
    /**
     *
     * @deprecated 	As of Version 2.2, this method is
     * 			replaced by {@link #getAttribute}.
     *
     * @param name		a string specifying the name of the object
     *
     * @return			the object with the specified name
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */
  
    public Object getValue(String name);
    
    
    

    /**
     *
     * Returns an <code>Enumeration of String objects
     * containing the names of all the objects bound to this session. 
     *
     * @return			an <code>Enumeration of 
     *				<code>String objects specifying the
     *				names of all the objects bound to
     *				this session
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */
    
    public Enumeration getAttributeNames();
    
    
    

    /**
     *
     * @deprecated 	As of Version 2.2, this method is
     * 			replaced by {@link #getAttributeNames}
     *
     * @return				an array of <code>String
     *					objects specifying the
     *					names of all the objects bound to
     *					this session
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */
    
    public String[] getValueNames();
    
    
    

    /**
     * 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,
     * the container calls 
     * <code>HttpSessionBindingListener.valueBound. The container then   
     * notifies any <code>HttpSessionAttributeListeners in the web 
     * application.
     
     * <p>If an object was already bound to this session of this name
     * that implements <code>HttpSessionBindingListener, its 
     * <code>HttpSessionBindingListener.valueUnbound method is called.
     *
     * <p>If the value passed in is null, this has the same effect as calling 
     * <code>removeAttribute().
     *
     *
     * @param name			the name to which the object is bound;
     *					cannot be null
     *
     * @param value			the object to be bound
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */
 
    public void setAttribute(String name, Object value);
    



    
    /**
     *
     * @deprecated 	As of Version 2.2, this method is
     * 			replaced by {@link #setAttribute}
     *
     * @param name			the name to which the object is bound;
     *					cannot be null
     *
     * @param value			the object to be bound; cannot be null
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     *
     */
 
    public void putValue(String name, Object value);





    /**
     *
     * 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,
     * the container calls 
     * <code>HttpSessionBindingListener.valueUnbound. The container
     * then notifies any <code>HttpSessionAttributeListeners in the web 
     * application.
     * 
     * 
     *
     * @param name				the name of the object to
     *						remove from this session
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     */

    public void removeAttribute(String name);





    /**
     *
     * @deprecated 	As of Version 2.2, this method is
     * 			replaced by {@link #removeAttribute}
     *
     * @param name				the name of the object to
     *						remove from this session
     *
     * @exception IllegalStateException	if this method is called on an
     *					invalidated session
     */

    public void removeValue(String name);




    /**
     *
     * Invalidates this session then unbinds any objects bound
     * to it. 
     *
     * @exception IllegalStateException	if this method is called on an
     *					already invalidated session
     *
     */

    public void invalidate();
    
    
    
    
    /**
     *
     * Returns <code>true 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.
     *
     * @return 				<code>true if the 
     *					server has created a session, 
     *					but the client has not yet joined
     *
     * @exception IllegalStateException	if this method is called on an
     *					already invalidated session
     *
     */

    public boolean isNew();



}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat HttpSession.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.