How to use design Pattern in place of switch case

I have enum class

public enum TaskName {
     LOGIN,REGISTER,MESSAGE
}

I use this enum with switch-case

public class TaskController {


    private UserDao userDaoJpaImpl;
    private FriendDao friendDaoJpaImpl;
    private GroupDao groupDaoJpaImpl;
    private MessageDao messageDaoJpaImpl;

    public TaskController() {
        EntityManagerFactory emfactory = Persistence.createEntityManagerFactory("Eclipselink_JPA");
        userDaoJpaImpl = new UserDaoJpaImpl(emfactory);
        friendDaoJpaImpl = new FriendDaoJpaImpl(emfactory);
        groupDaoJpaImpl = new GroupDaoJpaImpl(emfactory);
        messageDaoJpaImpl = new MessageDaoJpaImpl(emfactory);
    }

    public void doIt(String taskName)
    {
      switch (taskName) {
        case LOGIN:
            userDaoJpaImpl.create(/*Something*/);
            //Implementation
        break;
        case REGISTER:
            //Implementation
        break;
        case MESSAGE:
             messageDaoJpaImpl.create(/*Something*/);
            //Implementation
        break;
        }
    }
}

I create object of TaskController as static TaskController controller=new TaskController()

so that object created only once

Now I am planning to use Command Pattern in place of switch-case

but i am stuck how to use my UserDaoJpaImpl,FriendDaoJpaImpl,GroupDaoJpaImpl,MessageDaoJpaImpl inside Command classess

Edit

Command Class

public interface Command {

    void setSession(Session session); //Session is websocket connection session not HttpSession

    void setConnectedUser(Map<String, UserDTO> connectedUser);

    void setData(String data);        


    JSONObject execute();

}

I want to move whole logic from TaskController.doIt() to Other command class which will implement Command Interface.

I am using Websocket. I don't want to use spring for this problem

Thanks in advance