在最近一个新的项目里面要用openfire很多的自带功能，比如：加好友，加聊天室，发消息，发送文件，获取组消息，更新状态等。虽然用c++开发，但是先用java实现一下。smack可以说把openfire有设计的那些交互协议都封装的很完整，在消息服务器，其实很好实现各种功能，说到底就是协议的定义，openfire自己定义了这几种协议来实现这些功能，smack把这些协议封装成对应的对象去处理，让开发者更容易上手。

1.发消息：

public boolean sendMessage(String toJid,String content){		Message message = new Message();		message.setFrom(connectManager.getJid());		message.setTo(toJid);		message.setBody(content);		message.setType(Message.Type.chat);		message.setSubject(MSG_SUBJECT);//消息主题		BaseInfo baseInfo = new BaseInfo();		baseInfo.setRecvName("接收人");		baseInfo.setSendName("发送人");		message.addExtension(baseInfo);//消息包的扩展		return connectManager.sendPacket(message);	}

import org.jivesoftware.smack.packet.PacketExtension;public class BaseInfo implements PacketExtension{    private String sendName;    private String recvName;    	public String getRecvName() {		return recvName;	}	public void setRecvName(String recvName) {		this.recvName = recvName;	}	public String getSendName() {		return sendName;	}	public void setSendName(String sendName) {		this.sendName = sendName;	}	public String getElementName() {		 return "base_info";	}	public String getNamespace() {        return "uc:staff_name";	}	//重写xml方法	public String toXML() {		StringBuilder buf = new StringBuilder();        buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace()).append(            "\">");        if (getSendName() != null) {            buf.append("
    
     ").append(getSendName()).append("
    ");        }        if (getRecvName() != null) {            buf.append("
    
     ").append(getRecvName()).append("
    ");        }        buf.append("
    ");        return buf.toString();	}}

2.修改状态

/**	 * 修改状态	 * @param state	 * @return	 */	public boolean sendPresence(String state){		return sendPresence(state, null);	}		/**	 * 针对某人修改状态	 * @param state	 * @param toJid	 * @return	 */	public boolean sendPresence(String state,String toJid){		Presence.Type type = Presence.Type.available;		Presence.Mode mode =null;		String status =null;		if("1".equals(state)){			mode = Presence.Mode.chat;			status = "空闲";		}else if("2".equals(state)){			mode = Presence.Mode.xa;			status="离开一段时间";		}else if("3".equals(state)){			mode = Presence.Mode.away;			status="离开";		}else if("4".equals(state)){			mode = Presence.Mode.dnd;			status="正忙";		}else if("5".equals(state)){			type = Presence.Type.unavailable;			status = "隐身";		}else{			return false;		}		Presence presence = new Presence(type);		presence.setTo(toJid);		presence.setMode(mode);		presence.setStatus(status);		return connectManager.sendPacket(presence);	}

3.对Roster中好友组的操作

/**      * 返回所有组信息      * @return List(RosterGroup)      */      public List
    
      getGroups() {          List
     
       groupsList = new ArrayList
      
       ();          Collection
       
         rosterGroup = roster.getGroups();          Iterator
        
          i = rosterGroup.iterator();          while (i.hasNext()){          	RosterGroup group = i.next();            groupsList.add(group);            log.debug("获取组信息：name:"+group.getName());      }        return groupsList;      }        /**      * 返回相应(groupName)组里的所有用户     *       * @return List(RosterEntry)      */      public List
         
           getEntriesByGroup(String groupName) { List
          
            EntriesList = new ArrayList
           
            (); RosterGroup rosterGroup = roster.getGroup(groupName); if(rosterGroup !=null){ Collection
            
              rosterEntry = rosterGroup.getEntries(); Iterator
             
               i = rosterEntry.iterator(); while (i.hasNext()){ RosterEntry entry = i.next(); EntriesList.add(entry); log.debug("获取好友信息：name:"+entry.getName()+",status:"+entry.getStatus()+",group:"+entry.getGroups()+",type:"+entry.getType()+",user:"+entry.getUser()); } } return EntriesList; } /** * 返回所有用户信息 * * @return List(RosterEntry) */ public List
              
                getAllEntries() { List
               
                 EntriesList = new ArrayList
                
                 (); Collection
                 
                   rosterEntry = roster.getEntries(); Iterator
                  
                    i = rosterEntry.iterator(); while (i.hasNext()){ RosterEntry entry = i.next(); EntriesList.add(entry); log.debug("获取好友信息：name:"+entry.getName()+",status:"+entry.getStatus()+",group:"+entry.getGroups()+",type:"+entry.getType()+",user:"+entry.getUser()); } return EntriesList; }
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     
    

/**      * 添加一个好友无分组      */      public boolean addUser(String userName,String name)      {          try {              roster.createEntry(userName, name, null);              return true;          } catch (Exception e) {          	log.error("添加一个好友无分组异常",e);            return false;          }      }      /**      * 添加一个好友到分组      * @param roster      * @param userName      * @param name      * @return      */      public boolean addUser(String userName,String name,String groupName)      {          try {              roster.createEntry(userName, name,new String[]{groupName});              return true;          } catch (Exception e) {          	log.error("添加一个好友到分组异常",e);            return false;          }      }            /**      * 删除一个好友      * @param roster      * @param userName      * @return      */      public boolean removeUser(String userName){          try {              RosterEntry entry = roster.getEntry(userName);              roster.removeEntry(entry);          	log.debug("删除一个好友:"+entry.getName());            return true;          } catch (Exception e) {          	log.error("删除一个好友异常",e);            return false;          }                }