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, "[email protected]"); 
       muc.create("user1");  
      muc.sendConfigurationForm(new Form(Form.TYPE_SUBMIT));  
     
      //----创建手动配置聊天室----  
      muc = new MultiUserChat(connection, "[email protected]");  
     
      //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, "[email protected]");  
      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, "[email protected]");  
      //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, "[email protected]");  
      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, "[email protected]"); 
       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("[email protected]/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.