leaveroomaction.java

该源码是使用ajax技术实现的一个聊天室功能。如果想对程序进行修改

/*
 * Copyright 2005 Frank W. Zammetti
 *
 * Licensed 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 org.apache.struts.apps.ajaxchat.action;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.apps.ajaxchat.dao.AjaxChatDAO;
import org.apache.struts.apps.ajaxchat.dto.UserDTO;


/**
 * This is a Struts Action that is called when the user clicks the Leave Room
 * button while chatting in a room.
 *
 * @author <a href="mailto:[e-mail]">Frank W. Zammetti</a>.
 */
public class LeaveRoomAction extends Action {


  /**
   * Log instance.
   */
  private static Log log = LogFactory.getLog(LeaveRoomAction.class);


  /**
   * Execute.
   *
   * @param  mapping   ActionMapping.
   * @param  inForm    ActionForm.
   * @param  request   HttpServletRequest.
   * @param  response  HttpServletResponse.
   * @return           ActionForward.
   * @throws Exception If anything goes wrong.
   */
  public ActionForward execute(ActionMapping mapping, ActionForm inForm,
    HttpServletRequest request, HttpServletResponse response) throws Exception {

    log.debug("execute()...");

    HttpSession session = request.getSession();
    synchronized (session) {

      // Remove the user from the room they were in.
      UserDTO     user     = (UserDTO)session.getAttribute("user");
      String      roomName = (String)session.getAttribute("roomName");
      AjaxChatDAO dao      = AjaxChatDAO.getInstance();
      dao.removeUserFromRoom(roomName, user);

      // Return to the lobby.
      return mapping.findForward("gotoLobby");

    }

  } // End execute().


} // End class.