Liferay与Openfire集成 四 简单的二次开发

离线用户与离线消息

        接下来就基于Chat-Portlet的源码做一些改动，实现一些小的功能，也算是对Liferay学习暂时告一段落。原先的Chat-Portlet只能查看在线用户，那如果想给离线的用户留言怎么办？增加功能：获取全部的好友列表（包括离线用户）。

 

1. 离线消息存储在数据库中。在查询数据库时，返回的是全部的用户。查询数据库的函数在findByModifiedDate@StatusFinderImpl。在查找数据库时，取消Chat_Status.online=1的限制，即要求用户的状态不必是在线状态，并将Chat_Status.online的值返回。

 

public List<Object[]> findByModifiedDate(long companyId, long userId,long modifiedDate, int start, int end) throws SystemException {Session session = null;         try {     session = openSession();     String sql = CustomSQLUtil.get(FIND_BY_MODIFIED_DATE);     sql = " SELECT User_.userId AS userId, User_.screenName AS screenName, User_.firstName AS firstName, User_.middleName AS middleName, User_.lastName AS lastName, User_.portraitId AS portraitId, Chat_Status.awake AS awake,Chat_Status.online_ AS online FROM Chat_Status INNER JOIN User_ ON (User_.userId = Chat_Status.userId) WHERE (User_.companyId = ?) AND (User_.userId != ?) AND (Chat_Status.modifiedDate > ?) ORDER BY Chat_Status.awake ASC, User_.firstName ASC, User_.middleName ASC, User_.lastName ASC";     SQLQuery q = session.createSQLQuery(sql);     q.addScalar("userId", Type.LONG);     q.addScalar("screenName", Type.STRING);     q.addScalar("firstName", Type.STRING);     q.addScalar("middleName", Type.STRING);     q.addScalar("lastName", Type.STRING);     q.addScalar("portraitId", Type.LONG);     q.addScalar("awake", Type.BOOLEAN);     //返回状态标志     q.addScalar("online", Type.BOOLEAN);     QueryPos qPos = QueryPos.getInstance(q);     qPos.add(companyId);     qPos.add(userId);     qPos.add(modifiedDate);     return (List<Object[]>) QueryUtil.list(q, getDialect(), start, end);} catch (Exception e) {     throw new SystemException(e);} finally {     closeSession(session);}}

2.因为用户登录时，在Openfire服务器上也同时登录了，所以要根据Openfire上登录用户的Presence来判断其状态，返回的用户列表按顺序(是否唤醒、名字字典顺序)排序，其中在线的用户在前，离线的用户在后，处理排序的函数在getStatuses@JabberImpl中。

 

public List<Object[]> getStatuses(long companyId, long userId, List<Object[]> buddies) {try {Connection connection = getConnection(userId);if (connection == null) {if (_log.isWarnEnabled()) {_log.warn("User " + userId + " is not connected to Jabber");}return buddies;}List<Object[]> jabberBuddies = new ArrayList<Object[]>();//jabberBuddies.addAll(buddies);Roster roster = connection.getRoster();Collection<RosterEntry> rosterEntries = roster.getEntries();if (PortletPropsValues.JABBER_IMPORT_USER_ENABLED) {for (Object[] buddy : buddies) {String screenName = (String)buddy[1];String firstName = (String)buddy[2];String middleName = (String)buddy[3];String lastName = (String)buddy[4];String fullName = ContactConstants.getFullName(firstName, middleName, lastName);String jabberId = getFullJabberId(screenName);if (!roster.contains(jabberId)) {roster.createEntry(jabberId, fullName, null);}}}List<Object[]> jabberOffline = new ArrayList<Object[]>();BuddyComparator buddyComparator = new BuddyComparator(true);for (RosterEntry rosterEntry : rosterEntries) {Presence presence = roster.getPresence(rosterEntry.getUser());User user = UserLocalServiceUtil.getUserByScreenName(companyId, getScreenName(rosterEntry.getUser()));Object[] jabberBuddy = new Object[8];jabberBuddy[0] = user.getUserId();jabberBuddy[1] = user.getScreenName();jabberBuddy[2] = user.getFirstName();jabberBuddy[3] = user.getMiddleName();jabberBuddy[4] = user.getLastName();jabberBuddy[5] = user.getPortraitId();jabberBuddy[6] = true;jabberBuddy[7] = true;if (!presence.isAvailable()) {jabberBuddy[6] = false;jabberBuddy[7] = false;jabberOffline.add(jabberBuddy);continue;}if (Collections.binarySearch(jabberBuddies, jabberBuddy, buddyComparator) < 0) {jabberBuddies.add(jabberBuddy);}}Collections.sort(jabberBuddies, buddyComparator);Collections.sort(jabberOffline,buddyComparator);for(int i = 0;i < jabberOffline.size();i++){jabberBuddies.add(jabberOffline.get(i));}return jabberBuddies;}catch (Exception e) {_log.error("Unable to get Jabber buddies", e);return buddies;}}

3.返回的数据格式是JSON格式的，需要增加新的<key,value>对，key为online，value为是否在线的Boolean值，处理的函数在getBuddies@ChatPollerProcessor。

 

4. main.js处理页面前端的显示，回调函数_onPollerUpdate中调用_updateBuddies更新好友列表。收到应答后，对于返回的用户列表的每个用户，判断其online属性，如果是在线用户，则在用户名右端添加“[在线]”字样，否则，在用户名右端添加“[离线]”字样。

 

for (var i = 0; i < numBuddies; i++) {var buddy = buddyList[i];if(buddy.online==true){instance._onlineBuddiesCount = instance._onlineBuddiesCount+1;        }var currentBuddy = currentBuddies[buddy.userId];var currentChat = currentChats[buddy.userId];buddy.isTyping = false;if (currentChat && (!currentBuddy || currentBuddy.statusMessage != buddy.statusMessage)) {currentChat.updateStatus(buddy.statusMessage);}currentBuddies[buddy.userId] = buddy;var userImagePath = Liferay.Chat.Util.getUserImagePath(buddy.portraitId);var stat;        if(buddy.online==true)        {stat = buddy.fullName + " [在线]";                buffer.push('<li class="user active" userId="' + buddy.userId + '">' +        '<img alt="" src="' + userImagePath + '" />' +        '<div class="name">' + stat + '</div>' +        '<div class="buddy-services">');        }        else        {stat = buddy.fullName + " [离线]";                buffer.push('<li class="user active" userId="' + buddy.userId + '">' +        '<img style ="filter:Alpha(opacity=10,finishOpacity=0,style=0);" alt="" src="' + userImagePath + '" />' +        '<div class="name">' + stat + '</div>' +        '<div class="buddy-services">');        }var serviceNames = instance._buddyServices;for (var serviceName in serviceNames) {buffer.push('<div class="' + serviceName + '"></div>');}buffer.push('</div>' +'</li>');}

 

只是接触Liferay的一点点皮毛，所以如果有说的不对的地方，欢迎批评指正。:)