Xmpp获取离线消息

PPConnection.DEBUG_ENABLED = false;
    AccountManager accountManager;
    final ConnectionConfiguration connectionConfig = new ConnectionConfiguration(
        "192.168.1.78", Integer.parseInt("5222"), "csdn.shimiso.com");
 
    // 允许自动连接
    connectionConfig.setReconnectionAllowed(true);
    connectionConfig.setSendPresence(false);//不要告诉服务器自己的状态
    Connection connection = new XMPPConnection(connectionConfig);
    try {
      connection.connect();// 开启连接
      accountManager = connection.getAccountManager();// 获取账户管理类
    } catch (XMPPException e) {
      throw new IllegalStateException(e);
    } 
    connection.login("shimiso", "123","SmackTest"); 
    OfflineMessageManager offlineManager = new OfflineMessageManager(
        connection);
    try {
      Iterator<org.jivesoftware.smack.packet.Message> it = offlineManager
          .getMessages();
 
      System.out.println(offlineManager.supportsFlexibleRetrieval());
      System.out.println("离线消息数量: " + offlineManager.getMessageCount());
 
      Map<String, ArrayList<Message>> offlineMsgs = new HashMap<String, ArrayList<Message>>();
 
      while (it.hasNext()) {
        org.jivesoftware.smack.packet.Message message = it.next();
        System.out
            .println("收到离线消息, Received from 【" + message.getFrom()
                + "】 message: " + message.getBody());
        String fromUser = message.getFrom().split("/")[0];
 
        if (offlineMsgs.containsKey(fromUser)) {
          offlineMsgs.get(fromUser).add(message);
        } else {
          ArrayList<Message> temp = new ArrayList<Message>();
          temp.add(message);
          offlineMsgs.put(fromUser, temp);
        }
      }
 
      // 在这里进行处理离线消息集合......
      Set<String> keys = offlineMsgs.keySet();
      Iterator<String> offIt = keys.iterator();
      while (offIt.hasNext()) {
        String key = offIt.next();
        ArrayList<Message> ms = offlineMsgs.get(key);
 
        for (int i = 0; i < ms.size(); i++) {
          System.out.println("-->" + ms.get(i));
        }
      }
 
      offlineManager.deleteMessages();
    } catch (Exception e) {
      e.printStackTrace();
    }
    offlineManager.deleteMessages();//删除所有离线消息
    Presence presence = new Presence(Presence.Type.available);
                nnection.sendPacket(presence);//上线了
                nnection.disconnect();//关闭连接