Java-Netty拆分消息字节

我正试图用Netty 3从客户端向服务器发送消息

该信息包括：

400串 210个整数

消息平均字节数：3400

客户端正在成功发送消息，问题出在服务器上，服务器正在拆分字节

Client: sent 3400 bytes.    
Server: received 1024 bytes.
Server: received 2048 bytes.
Server: received 328 bytes.

编码：

public void sendFriendList(final Player player) {
    final int friendsSize = player.getFriendsIgnores().getFriends().size();
        final OutputStream stream = new OutputStream(12500);
        stream.writeSmart(83); //packet ID
        stream.writeShort(friendsSize); //number of friends
        stream.writeInt(player.getPlayerDefinition().index()); //player id
        for (int id : player.getFriendsIgnores().getFriends()) { //array of integers
            stream.writeInt(id);
            stream.writeString(PlayerLoader.getUsername(id));
            stream.writeString(PlayerLoader.getDisplayName(id));
            stream.writeInt(PlayerLoader.getWorld(id));
        }
        session.write(stream);
    }        

解码：

case 83:
        int friendsSize = stream.readUnsignedShort();
        int playerId = stream.readInt();
        player = World.get(playerId);

        if (player != null) {
            for (int i = 0; i < friendsSize; i++) {
            int id = stream.readInt();
            username = stream.readString();
            displayName = stream.readString();
            world = stream.readInt();
            player.getFriendsIgnores().addFriendDetails(id, username, displayName, world);
            }
        }
        break;    

案例83：
int-friendsize=stream.readUnsignedShort（）；
int playerId=stream.readInt（）；
player=World.get（playerId）；
如果（玩家！=null）{
for（int i=0；i

Tom的问题是什么？如何在一条消息中获取完整字节，而不是在三条消息中获取拆分字节？