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    1   /*
    2    * $Id: LogoffAction.java 471754 2006-11-06 14:55:09Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21
    22
    23  package org.apache.struts.webapp.example2;
    24
    25
    26  import javax.servlet.http.HttpServletRequest;
    27  import javax.servlet.http.HttpServletResponse;
    28  import javax.servlet.http.HttpSession;
    29  import org.apache.commons.logging.Log;
    30  import org.apache.commons.logging.LogFactory;
    31  import org.apache.struts.action.Action;
    32  import org.apache.struts.action.ActionForm;
    33  import org.apache.struts.action.ActionForward;
    34  import org.apache.struts.action.ActionMapping;
    35
    36
    37  /**
    38   * Implementation of <strong>Action</strong> that processes a
    39   * user logoff.
    40   *
    41   * @author Craig R. McClanahan
    42   * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
    43   */
    44
    45  public final class LogoffAction extends Action {
    46
    47
    48      // ----------------------------------------------------- Instance Variables
    49
    50
    51      /**
    52       * The <code>Log</code> instance for this application.
    53       */
    54      private Log log =
    55          LogFactory.getLog("org.apache.struts.webapp.Example");
    56
    57
    58      // --------------------------------------------------------- Public Methods
    59
    60
    61      /**
    62       * Process the specified HTTP request, and create the corresponding HTTP
    63       * response (or forward to another web component that will create it).
    64       * Return an <code>ActionForward</code> instance describing where and how
    65       * control should be forwarded, or <code>null</code> if the response has
    66       * already been completed.
    67       *
    68       * @param mapping The ActionMapping used to select this instance
    69       * @param form The optional ActionForm bean for this request (if any)
    70       * @param request The HTTP request we are processing
    71       * @param response The HTTP response we are creating
    72       *
    73       * @exception Exception if business logic throws an exception
    74       */
    75      public ActionForward execute(ActionMapping mapping,
    76                   ActionForm form,
    77                   HttpServletRequest request,
    78                   HttpServletResponse response)
    79      throws Exception {
    80
    81      // Extract attributes we will need
    82      HttpSession session = request.getSession();
    83      User user = (User) session.getAttribute(Constants.USER_KEY);
    84
    85      // Process this user logoff
    86      if (user != null) {
    87              if (log.isDebugEnabled()) {
    88                  log.debug("LogoffAction: User '" + user.getUsername() +
    89                            "' logged off in session " + session.getId());
    90              }
    91      } else {
    92              if (log.isDebugEnabled()) {
    93                  log.debug("LogoffActon: User logged off in session " +
    94                            session.getId());
    95              }
    96      }
    97      session.removeAttribute(Constants.SUBSCRIPTION_KEY);
    98      session.removeAttribute(Constants.USER_KEY);
    99      session.invalidate();
    100
    101     // Forward control to the specified success URI
    102     return (mapping.findForward("success"));
    103
    104     }
    105
    106
    107 }