?? listusersinroomaction.java
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/*
* 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 java.io.PrintWriter;
import java.util.Date;
import java.util.Iterator;
import java.util.Vector;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.lang.StringEscapeUtils;
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 via AJAX request to retrieve the list
* of users in the room the user is currently in.
*
* @author <a href="mailto:frank.zammetti@pfpc.com">Frank W. Zammetti</a>.
*/
public class ListUsersInRoomAction extends Action {
/**
* Log instance.
*/
private static Log log = LogFactory.getLog(ListUsersInRoomAction.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) {
// Record this as the last AJAX request for the user.
UserDTO user = (UserDTO)session.getAttribute("user");
user.setLastAJAXRequest(new Date());
session.setAttribute("user", user);
// We'll need the name of the room to get a list for.
String roomName = (String)request.getSession().getAttribute("roomName");
log.debug("Getting user list for roomName = " + roomName);
// Get user list and create a CSV list from it.
AjaxChatDAO dao = AjaxChatDAO.getInstance();
Vector userList = dao.getUserList(roomName);
log.debug("userList = " + userList);
StringBuffer xmlOut = new StringBuffer(1024);
xmlOut.append("<users>");
for (Iterator it = userList.iterator(); it.hasNext();) {
UserDTO user1 = (UserDTO)it.next();
xmlOut.append("<user name=\"" +
StringEscapeUtils.escapeXml(user1.getUsername()) + "\"/>");
}
xmlOut.append("</users>");
// Write out XML to response.
log.debug(xmlOut);
response.setContentType("text/xml");
PrintWriter out = response.getWriter();
out.println(xmlOut.toString());
out.flush();
// Response fully formed, nowhere to forward to.
return null;
}
} // End execute().
} // End class.
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