Android中基于XMPP协议实现IM聊天程序与多人聊天室

简单的IM聊天程序
由于项目需要做一个基于XMPP协议的Android通讯软件。故开始研究XMPP。
XMPP协议采用的是客户端-服务器架构，所有从一个客户端发到另一个客户端的消息和数据都必须经过XMPP服务器转发，而且支持服务器间DNS的路由，也就是说可以构建服务器集群，使不同的

服务器下的客户端也可以通信，XMPP的前身是一个开源组织制定的网络通信协议——Jabber，XMPP的核心是在网络上分片段发送XML流的协议，这个协议是XMPP的即时通讯指令的传递手段。
      为了防止服务器间发送的数据被篡改或偷听，XMPP服务器通信引入了TLS机制，使用TLS机制能实现数据的加密，从而保证了在数据传输过程种数据的安全。
      一个XMPP实体的地址称为Jabber Identifier或JID，作用类似于IP地址。一个合法的JID包括节点名,域名资源名，其格式为：jid=[node'@']domain['/'resource]

XMPP协议的命名空间：

• jabber:iq:private   -- 私有数据存储，用于本地用户私人设置信息，比如用户备注等。
• jabber:iq:conference  -- 一般会议，用于多个用户之间的信息共享
• jabber:x:encrypted -- 加密的消息，用于发送加密消息
• jabber:x:expire  -- 消息终止
• jabber:iq:time  -- 客户端时间
• jabber:iq:auth  -- 简单用户认证，一般用于服务器之间或者服务器和客户端之间的认证
• jabber:x:roster  -- 内部花名册
• jabber:x:signed  -- 标记的在线状态
• jabber:iq:search -- 用户数据库查询，用于向服务器发送查询请求
• jabber:iq:register -- 注册请求，用于用户注册相关信息
• jabber:x:iq:roster -- 花名册管理
• jabber:x:conference -- 会议邀请，用于向参加会议用户发送开会通知
• jabber:x:event  -- 消息事件
• vcard-temp  -- 临时的vCard,用于设置用户的头像以及昵称等

在网上找了下，有开源的项目BEEM，开源的用于android的xmpp框架asmack，asmack是smack的android版本。现在开始学习smack

。Xmpp就是神马东西，就不废话了。首先在网上下一个Openfire和Spack，不知道这两个是什么东西，就直接google吧。安装openfire需要mysql的支持，当然，oracle，sqlserver肯定是可以的。还是先上图吧：

Openfire + Spark + MyXMPPP

import java.io.InputStreamReader;
import java.util.Collection; 

import org.jivesoftware.smack.Chat;
import org.jivesoftware.smack.ChatManager;
import org.jivesoftware.smack.ChatManagerListener;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.MessageListener;
import org.jivesoftware.smack.PrivacyListManager;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.RosterGroup;
import org.jivesoftware.smack.RosterListener;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Presence; 

public class TestSmack {
  public static void main(String[] args) {XMPPConnection.DEBUG_ENABLED = true;
    //我的电脑IP:10.16.25.90
    final ConnectionConfiguration connectionConfig = new ConnectionConfiguration("10.16.25.91", 5222, "");
    connectionConfig.setSASLAuthenticationEnabled(false);
        try { 

          XMPPConnection connection = new XMPPConnection(connectionConfig);
          connection.connect();//连接
          connection.login("test", "test");//登陆
          System.out.println(connection.getUser());
          ChatManager chatmanager = connection.getChatManager(); 

          //新建一个会话
          Chat newChat = chatmanager.createChat("test3@pc2010102716", new MessageListener() {
            public void processMessage(Chat chat, Message message) {
              System.out.println("Received from 【" + message.getFrom() + "】 message: " + message.getBody());
            }
          }); 

          // 监听被动接收消息，或广播消息监听器
          chatmanager.addChatListener(new ChatManagerListener() {
            @Override
            public void chatCreated(Chat chat, boolean createdLocally) {
              chat.addMessageListener(new MessageListener() {
                @Override
                public void processMessage(Chat chat, Message message) {
                  System.out.println("Received from 【" + message.getFrom() + "】 message: " + message.getBody());
                } 

              });
            }
          });
          //发送消息
          newChat.sendMessage("我是菜鸟"); 

          //获取花名册
          Roster roster = connection.getRoster();
          Collection<RosterEntry> entries = roster.getEntries();
          for(RosterEntry entry : entries) {
            System.out.print(entry.getName() + " - " + entry.getUser() + " - " + entry.getType() + " - " + entry.getGroups().size());
            Presence presence = roster.getPresence(entry.getUser());
            System.out.println(" - " + presence.getStatus() +" - "+ presence.getFrom());
          } 

          //添加花名册监听器，监听好友状态的改变。
          roster.addRosterListener(new RosterListener() { 

            @Override
            public void entriesAdded(Collection<String> addresses) {
              System.out.println("entriesAdded");
            } 

            @Override
            public void entriesUpdated(Collection<String> addresses) {
              System.out.println("entriesUpdated");
            } 

            @Override
            public void entriesDeleted(Collection<String> addresses) {
              System.out.println("entriesDeleted");
            } 

            @Override
            public void presenceChanged(Presence presence) {
              System.out.println("presenceChanged - >" + presence.getStatus());
            } 

          }); 

          //创建组
//         /RosterGroup group = roster.createGroup("大学");
//         for(RosterEntry entry : entries) {
//           group.addEntry(entry);
//         }
          for(RosterGroup g : roster.getGroups()) {
            for(RosterEntry entry : g.getEntries()) {
              System.out.println("Group " +g.getName() +" >> " + entry.getName() + " - " + entry.getUser() + " - " + entry.getType() + " - " + entry.getGroups().size());
            }
          } 

          //发送消息
          BufferedReader cmdIn = new BufferedReader(new InputStreamReader(System.in));
          while(true) {
           try {
             String cmd = cmdIn.readLine();
             if("!q".equalsIgnoreCase(cmd)) {
               break;
             }
             newChat.sendMessage(cmd);
           }catch(Exception ex) {
           }
          }
          connection.disconnect();
          System.exit(0);
        } catch (Exception e) {
          e.printStackTrace();
        }
  }
}

以上代码如果在一般的Java Project上运行需要加入smack.jar 和klmx2.jar,如果是Android Project，基本代码不需改变只需将其放入onCreate(...)方法下即可，需要加入asmack.jar包.

1、ConnectionConfiguration
 作为用于与XMPP服务建立连接的配置。它能配置；连接是否使用TLS，SASL加密。
 包含内嵌类：ConnectionConfiguration.SecurityMode

2、XMPPConnection.
 XMPPConnection这个类用来连接XMPP服务.
 可以使用connect()方法建立与服务器的连接。disconnect()方法断开与服务器的连接.
 在创建连接前可以使用XMPPConnection.DEBUG_ENABLED = true; 使开发过程中可以弹出一个GUI窗口，用于显示我们的连接与发送Packet的信息。

3、ChatManager
 用于监控当前所有chat。可以使用createChat(String userJID, MessageListener listener)创建一个聊天。
 
4、Chat
 Chat用于监控两个用户间的一系列message。使用addMessageListener(MessageListener listener)当有任何消息到达时将会触发listener的processMessage(Chat chat, Message message)
方法.
 我们可以使用sendMessage()发送消息,这个方法有两个重载方法，一种类类型的参数时String类型，另一种则是传入Message对象(后面介绍)。
 那么有这样一种情况，当别人主动跟我们建立连接发送消息，或者系统发送消息时我们怎么才能接收消息呢？
    我现在是这样操作的：

 chatmanager.addChatListener(new ChatManagerListener() {
 @Override
 public void chatCreated(Chat chat, boolean createdLocally) {
  chat.addMessageListener(new MessageListener() {
  @Override
  public void processMessage(Chat chat, Message message) {
   System.out.println("Received message: " + message.getBody());
  }

  });
 }
 });

5、Message

• Message用于表示一个消息包(可以用调试工具看到发送包和接收包的具体内容)。它有以下多种类型。
• Message.Type.NORMAL -- （默认）文本消息（比如邮件）
• Message.Type.CHAT -- 典型的短消息，如QQ聊天的一行一行显示的消息
• Message.Type.GROUP_CHAT -- 群聊消息
• Message.Type.HEADLINE -- 滚动显示的消息
• Message.TYPE.ERROR -- 错误的消息
• Message有两个内部类：
• Message.Body -- 表示消息体
• Message.Type -- 表示消息类型

6、Roster
 表示存储了很多RosterEntry的一个花名册.为了易于管理，花名册的项被分贝到了各个group中.
 当建立与XMPP服务的连接后可以使用connection.getRoster()获取Roster对象。
 别的用户可以使用一个订阅请求(相当于QQ加好友)尝试订阅目的用户。可以使用枚举类型Roster.SubscriptionMode的值处理这些请求：
 accept_all: 接收所有订阅请求
 reject_all：拒绝所有订阅请求
 manual：  手工处理订阅请求
 
 创建组：RosterGroup group = roster.createGroup("大学");
 向组中添加RosterEntry对象: group.addEntry(entry);
 
7、RosterEntry
 表示Roster（花名册）中的每条记录.它包含了用户的JID，用户名，或用户分配的昵称.
 
8、RosterGroup
 表示RosterEntry的组。可以使用addEntry(RosterEntry entry)添加。contains(String user) 判断某用户是否在组中.当然removeEntry(RosterEntry entry)就是从组中移除了。getEntries()

获取所有RosterEntry.
 
9、Presence
 表示XMPP状态的packet。每个presence packet都有一个状态。用枚举类型Presence.Type的值表示：
 available -- （默认）用户空闲状态
 unavailable -- 用户没空看消息
 subscribe -- 请求订阅别人，即请求加对方为好友
 subscribed -- 统一被别人订阅，也就是确认被对方加为好友
 unsubscribe -- 他取消订阅别人，请求删除某好友
 unsubscribed -- 拒绝被别人订阅，即拒绝对放的添加请求
 error -- 当前状态packet有错误
 内嵌两个枚举类型:Presence.Mode和Presence.Type.
 可以使用setStatus自定义用户当前的状态（像QQ一样的)

MultiUserChat聊天室

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;  

import org.jivesoftware.smack.Chat;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.MessageListener;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.provider.ProviderManager;
import org.jivesoftware.smackx.Form;
import org.jivesoftware.smackx.FormField;
import org.jivesoftware.smackx.ServiceDiscoveryManager;
import org.jivesoftware.smackx.muc.DefaultParticipantStatusListener;
import org.jivesoftware.smackx.muc.DefaultUserStatusListener;
import org.jivesoftware.smackx.muc.DiscussionHistory;
import org.jivesoftware.smackx.muc.HostedRoom;
import org.jivesoftware.smackx.muc.InvitationListener;
import org.jivesoftware.smackx.muc.InvitationRejectionListener;
import org.jivesoftware.smackx.muc.MultiUserChat;
import org.jivesoftware.smackx.muc.RoomInfo;
import org.jivesoftware.smackx.muc.SubjectUpdatedListener;
import org.jivesoftware.smackx.packet.ChatStateExtension;
import org.jivesoftware.smackx.packet.DiscoverInfo;
import org.jivesoftware.smackx.packet.DiscoverItems;
import org.jivesoftware.smackx.packet.OfflineMessageInfo;
import org.jivesoftware.smackx.packet.OfflineMessageRequest;
import org.jivesoftware.smackx.provider.AdHocCommandDataProvider;
import org.jivesoftware.smackx.provider.BytestreamsProvider;
import org.jivesoftware.smackx.provider.DataFormProvider;
import org.jivesoftware.smackx.provider.DiscoverInfoProvider;
import org.jivesoftware.smackx.provider.DiscoverItemsProvider;
import org.jivesoftware.smackx.provider.IBBProviders;
import org.jivesoftware.smackx.provider.MUCAdminProvider;
import org.jivesoftware.smackx.provider.MUCOwnerProvider;
import org.jivesoftware.smackx.provider.MUCUserProvider;
import org.jivesoftware.smackx.provider.StreamInitiationProvider;
import org.jivesoftware.smackx.provider.VCardProvider;
import org.jivesoftware.smackx.provider.XHTMLExtensionProvider;  

public class TestSmack2 {
  public static void main(String[] args) {XMPPConnection.DEBUG_ENABLED = true;
    final ConnectionConfiguration connectionConfig = new ConnectionConfiguration("PC2010102716", 5222, "");
    connectionConfig.setSASLAuthenticationEnabled(false);
    ProviderManager pm = ProviderManager.getInstance();
    configure(pm);
    try {
      XMPPConnection connection = new XMPPConnection(connectionConfig);
      connection.connect();//连接
      initFeatures(connection);
      connection.login("test", "test");//登陆
      //聊天室
      //MultiUserChat multiUserChat = new MultiUserChat(connection, new InvitationListener() {});
       //查找服务
      System.out.println(connection.getServiceName());
      List<String> col = getConferenceServices(connection.getServiceName(), connection);
      for (Object aCol : col) {
        String service = (String) aCol;
         //查询服务器上的聊天室
        Collection<HostedRoom> rooms = MultiUserChat.getHostedRooms(connection, service);
        for(HostedRoom room : rooms) {
          //查看Room消息
          System.out.println(room.getName() + " - " +room.getJid());
          RoomInfo roomInfo = MultiUserChat.getRoomInfo(connection, room.getJid());
          if(roomInfo != null) {
            System.out.println(roomInfo.getOccupantsCount() + " : " + roomInfo.getSubject());
          }
         }
      }  

      /*---创建默认配置的聊天室 ---
      先看看官方的文档：
      Creates a new multi user chat with the specified connection and room name. Note: no
         * information is sent to or received from the server until you attempt to
         * {@link #join(String) join} the chat room. On some server implementations,
         * the room will not be created until the first person joins it
         * 最重要一句:直到用户调用join方法的时候聊天室才会被创建
         */
      MultiUserChat muc = new MultiUserChat(connection, "instant@conference.pc2010102716");
       muc.create("user1");
      muc.sendConfigurationForm(new Form(Form.TYPE_SUBMIT));  

      //----创建手动配置聊天室----
      muc = new MultiUserChat(connection, "reserved4@conference.pc2010102716");  

      //销毁聊天室
      //muc.destroy("Test", null);
      muc.create("user2");
      //获取聊天室的配置表单
      Form form = muc.getConfigurationForm();
      //根据原始表单创建一个要提交的新表单
      Form submitForm = form.createAnswerForm();
      //向提交的表单添加默认答复
      for(Iterator<FormField> fields = form.getFields(); fields.hasNext();) {
        FormField field = (FormField) fields.next();
        if(!FormField.TYPE_HIDDEN.equals(field.getType()) && field.getVariable() != null) {
          submitForm.setDefaultAnswer(field.getVariable());
        }
      }
      //重新设置聊天室名称
      submitForm.setAnswer("muc#roomconfig_roomname", "Reserved4 Room");
      //设置聊天室的新拥有者
      List<String> owners = new ArrayList<String>();
      owners.add("test@pc2010102716");
      submitForm.setAnswer("muc#roomconfig_roomowners", owners);
      //设置密码
      submitForm.setAnswer("muc#roomconfig_passwordprotectedroom", true);
      submitForm.setAnswer("muc#roomconfig_roomsecret", "reserved");
      //设置描述
      submitForm.setAnswer("muc#roomconfig_roomdesc", "新创建的reserved聊天室");
      //设置聊天室是持久聊天室，即将要被保存下来
      //submitForm.setAnswer("muc#roomconfig_persistentroom", true);
      //发送已完成的表单到服务器配置聊天室
      muc.sendConfigurationForm(submitForm);  

      //加入聊天室(使用昵称喝醉的毛毛虫 ,使用密码ddd)
      muc = new MultiUserChat(connection, "ddd@conference.pc2010102716");
      muc.join("喝醉的毛毛虫", "ddd");  

      //监听消息
      muc.addMessageListener(new PacketListener() {
        @Override
        public void processPacket(Packet packet) {
          Message message = (Message) packet;
          System.out.println(message.getFrom() + " : " + message.getBody());;
        }
      });  

      //muc = new MultiUserChat(connection, "ddd@conference.pc2010102716");
      //muc.join("喝醉的毛毛虫", "ddd");  

      //加入聊天室(使用昵称喝醉的毛毛虫 ,使用密码ddd)并且获取聊天室里最后5条信息，
      //注：addMessageListener监听器必须在此join方法之前，否则无法监听到需要的5条消息
      muc = new MultiUserChat(connection, "ddd@conference.pc2010102716");
      DiscussionHistory history = new DiscussionHistory();
      history.setMaxStanzas(5);
      muc.join("喝醉的毛毛虫", "ddd", history, SmackConfiguration.getPacketReplyTimeout());  

      //监听拒绝加入聊天室的用户
      muc.addInvitationRejectionListener(new InvitationRejectionListener() {
        @Override
        public void invitationDeclined(String invitee, String reason) {
        System.out.println(invitee + " reject invitation, reason is " + reason);
        }
      });
      //邀请用户加入聊天室
      muc.invite("test3@pc2010102716", "大家来谈谈人生");
      //监听邀请加入聊天室请求
      MultiUserChat.addInvitationListener(connection, new InvitationListener() {
        @Override
        public void invitationReceived(XMPPConnection conn, String room, String inviter, String reason, String password, Message message) {
        //例：直接拒绝邀请
        MultiUserChat.decline(conn, room, inviter, "你丫很闲啊！");
        }
      });  

      //根据roomJID获取聊天室信息
      RoomInfo roomInfo = MultiUserChat.getRoomInfo(connection, "ddd@conference.pc2010102716");
       System.out.println(roomInfo.getRoom() + "-" + roomInfo.getSubject() + "-" + roomInfo.getOccupantsCount()); 

      //判断用户是否支持Multi-User聊天协议
      //注：需要加上资源标识符
      boolean supports = MultiUserChat.isServiceEnabled(connection, "test3@pc2010102716/spark");
       //获取某用户所加入的聊天室
      if(supports) {
        Iterator<String> joinedRooms = MultiUserChat.getJoinedRooms(connection, "test3@pc2010102716/spark");
        while(joinedRooms.hasNext()) {
          System.out.println("test3 has joined Room " + joinedRooms.next());
        }
      }  

      //与聊天室用户私聊
      Chat chat = muc.createPrivateChat("ddd@conference.pc2010102716/飞鸟", new MessageListener() {
         @Override
         public void processMessage(Chat chat, Message message) {
           System.out.println("Private Chat: Received message from " + message.getFrom() + "-" + message.getBody());
         }
      });
      chat.sendMessage("今天不用加班吧？");  

      //改变聊天室主题
      muc.addSubjectUpdatedListener(new SubjectUpdatedListener() {
        @Override
        public void subjectUpdated(String subject, String from) {
          System.out.println("Subject updated to " + subject +" by " + from);
        }
      });
      //muc.changeSubject("New Subject11");  

      /*一个成员可能有四种角色:
      1：主持者(Moderator) （权限最大的角色，管理其他成员在聊天室中的角色
      2：参与者(Participant
      3：游客 (Visitor) (不能向所有成员发送消息)
      4：无（没有角色）（NONE）
      */  

      /*聊天室用户可以有5种从属关系
       * 1、所有者 Owner
       * 2、管理员 Admin
       * 3、成员 Member
       * 4、被驱逐者 Outcast
       * 5、无（不存在从属关系) None
       */  

      //配置聊天室为Moderated聊天室
      form = muc.getConfigurationForm();
      Form answerForm = form.createAnswerForm();
      answerForm.setAnswer("muc#roomconfig_moderatedroom", "1");
      muc.sendConfigurationForm(answerForm);  

      //监听自己的状态变更和事件
      muc.addUserStatusListener(new DefaultUserStatusListener() {
        @Override
        public void voiceRevoked() {
          super.voiceRevoked();
          System.out.println("你被禁言了!");
        }  

        @Override
        public void voiceGranted() {
          super.voiceGranted();
          System.out.println("你被批准发言了!");
        }  

        @Override
        public void membershipGranted() {
          super.membershipGranted();
          System.out.println("你被赋予了Member权限");
        }  

        @Override
        public void membershipRevoked() {
          super.membershipRevoked();
          System.out.println("你被解除了Member权限");
        }  

        @Override
        public void adminGranted() {
          super.adminGranted();
          System.out.println("你被赋予了管理员权限");
        }  

        @Override
        public void adminRevoked() {
        super.adminRevoked();
        System.out.println("你被解除了管理员权限");
        }
      //......
      });
      //房主(Owner)批准test3发言权
      muc.grantVoice("test3@pc2010102716");  

      //监听他人状态变更
      muc.addParticipantStatusListener(new DefaultParticipantStatusListener() {  

        @Override
        public void voiceGranted(String participant) {
          super.voiceGranted(participant);
        System.out.println(participant + "被批准发言了!");
        }  

        @Override
        public void voiceRevoked(String participant) {
          super.voiceRevoked(participant);
          System.out.println(participant + "被禁言了!");
        }  

        @Override
        public void membershipRevoked(String participant) {
          super.membershipRevoked(participant);
        }  

        @Override
        public void adminGranted(String participant) {
          super.adminGranted(participant);
        }  

        @Override
        public void adminRevoked(String participant) {
          super.adminRevoked(participant);
        }  

      });  

      //房主(Owner)批准test3管理员特权
      muc.grantAdmin("test3@pc2010102716");  

      //发送消息
      BufferedReader cmdIn = new BufferedReader(new InputStreamReader(System.in));
      while(true) {
        try {
           String cmd = cmdIn.readLine();
           if("!q".equalsIgnoreCase(cmd)) {
             break;
           }
         }catch(Exception ex) {
         }
      }
      connection.disconnect();
      System.exit(0);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }  

  public static List<String> getConferenceServices(String server, XMPPConnection connection) throws Exception {
   List<String> answer = new ArrayList<String>();
      ServiceDiscoveryManager discoManager = ServiceDiscoveryManager.getInstanceFor(connection);
       DiscoverItems items = discoManager.discoverItems(server);
      for (Iterator<DiscoverItems.Item> it = items.getItems(); it.hasNext();) {
         DiscoverItems.Item item = (DiscoverItems.Item)it.next();
        if (item.getEntityID().startsWith("conference") || item.getEntityID().startsWith("private")) {
           answer.add(item.getEntityID());
        }
        else {
          try {
            DiscoverInfo info = discoManager.discoverInfo(item.getEntityID());
             if (info.containsFeature("http://jabber.org/protocol/muc")) {
               answer.add(item.getEntityID());
            }
          }
          catch (XMPPException e) {
          }
        }
      }
      return answer;
    }  

  private static void configure(ProviderManager pm) {
    // Service Discovery # Items
    pm.addIQProvider("query", "http://jabber.org/protocol/disco#items", new DiscoverItemsProvider());
     // Service Discovery # Info
    pm.addIQProvider("query", "http://jabber.org/protocol/disco#info", new DiscoverInfoProvider()); 

    // Service Discovery # Items
    pm.addIQProvider("query", "http://jabber.org/protocol/disco#items", new DiscoverItemsProvider());
     // Service Discovery # Info
    pm.addIQProvider("query", "http://jabber.org/protocol/disco#info", new DiscoverInfoProvider()); 

    //Offline Message Requests
    pm.addIQProvider("offline","http://jabber.org/protocol/offline", new OfflineMessageRequest.Provider());
        //Offline Message Indicator
        pm.addExtensionProvider("offline","http://jabber.org/protocol/offline", new OfflineMessageInfo.Provider());     

    //vCard
    pm.addIQProvider("vCard","vcard-temp", new VCardProvider());  

    //FileTransfer
    pm.addIQProvider("si","http://jabber.org/protocol/si", new StreamInitiationProvider());
        pm.addIQProvider("query","http://jabber.org/protocol/bytestreams", new BytestreamsProvider());
        pm.addIQProvider("open","http://jabber.org/protocol/ibb", new IBBProviders.Open());
        pm.addIQProvider("close","http://jabber.org/protocol/ibb", new IBBProviders.Close());
        pm.addExtensionProvider("data","http://jabber.org/protocol/ibb", new IBBProviders.Data());
        //Data Forms
      pm.addExtensionProvider("x", "jabber:x:data", new DataFormProvider());
      //Html
      pm.addExtensionProvider("html", "http://jabber.org/protocol/xhtml-im", new XHTMLExtensionProvider());
      //Ad-Hoc Command
      pm.addIQProvider("command", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider());
    // Chat State
    ChatStateExtension.Provider chatState = new ChatStateExtension.Provider();
    pm.addExtensionProvider("active", "http://jabber.org/protocol/chatstates", chatState);
    pm.addExtensionProvider("composing", "http://jabber.org/protocol/chatstates",
      chatState);
    pm.addExtensionProvider("paused", "http://jabber.org/protocol/chatstates", chatState);
    pm.addExtensionProvider("inactive", "http://jabber.org/protocol/chatstates", chatState);
    pm.addExtensionProvider("gone", "http://jabber.org/protocol/chatstates", chatState);
    //MUC User,Admin,Owner
    pm.addExtensionProvider("x", "http://jabber.org/protocol/muc#user", new MUCUserProvider());
    pm.addIQProvider("query", "http://jabber.org/protocol/muc#admin", new MUCAdminProvider());
    pm.addIQProvider("query", "http://jabber.org/protocol/muc#owner", new MUCOwnerProvider());
  }  

  private static void initFeatures(XMPPConnection xmppConnection) {
    ServiceDiscoveryManager.setIdentityName("Android_IM");
    ServiceDiscoveryManager.setIdentityType("phone");
    ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(xmppConnection);
     if(sdm == null) {
    sdm = new ServiceDiscoveryManager(xmppConnection);
    }
    sdm.addFeature("http://jabber.org/protocol/disco#info");
    sdm.addFeature("http://jabber.org/protocol/caps");
    sdm.addFeature("urn:xmpp:avatar:metadata");
    sdm.addFeature("urn:xmpp:avatar:metadata+notify");
    sdm.addFeature("urn:xmpp:avatar:data");
    sdm.addFeature("http://jabber.org/protocol/nick");
    sdm.addFeature("http://jabber.org/protocol/nick+notify");
    sdm.addFeature("http://jabber.org/protocol/xhtml-im");
    sdm.addFeature("http://jabber.org/protocol/muc");
    sdm.addFeature("http://jabber.org/protocol/commands");
    sdm.addFeature("http://jabber.org/protocol/si/profile/file-transfer");
    sdm.addFeature("http://jabber.org/protocol/si");
    sdm.addFeature("http://jabber.org/protocol/bytestreams");
    sdm.addFeature("http://jabber.org/protocol/ibb");
    sdm.addFeature("http://jabber.org/protocol/feature-neg");
    sdm.addFeature("jabber:iq:privacy");
  }  

}

上面有两张Spark客户端的聊天室列表占有者一列不同的原因：当使用以下代码获取时不能获取occupantsCount和subject的值：

System.out.println(roomInfo.getOccupantsCount() + " : " + roomInfo.getSubject());

这是由于Openfire端有个bug（暂且这样说吧，我不知为什么Openfire这样做）.首先修改Smack的一个bug,修改RoomInfo类的RoomInfo(DiscoverInfo info) 方法:

Iterator<String> values = form.getField("muc#roominfo_subject").getValues();
if (values.hasNext()) {
  this.subject = values.next();
}
else {
  this.subject = "";
}

改为：

final FormField subjField = form.getField("muc#roominfo_subject");
this.subject = subjField == null ? "" : subjField.getValues().next();

修改Openfire的源码，org/jivesoftware/openfire/muc/spi/MultiUserChatServiceImpl类的public DataForm getExtendedInfo(String name, String node, JID senderJID) 方法：

      /*final FormField fieldOcc = dataForm.addField(); */
      fieldSubj.setVariable("muc#roominfo_occupants");
      fieldSubj.setLabel(LocaleUtils.getLocalizedString("muc.extended.info.occupants"));
      fieldSubj.addValue(Integer.toString(room.getOccupantsCount()));

改为：

final FormField fieldOccu= dataForm.addField()； 
fieldOccu.setVariable("muc#roominfo_occupants"); 
fieldOccu.setLabel(LocaleUtils.getLocalizedString("muc.extended.info.occupants")); 
fieldOccu.addValue(Integer.toString(room.getOccupantsCount()));

使用asmack开发基于Android的IM系统同理.