问题
What's the difference between:
public class GameController implements Serializable{
@ManagedProperty(value="#{Gamebean}")
private Game game;
and
public class GameController implements Serializable{
private Game game;
public GameController(){
game =(Game)FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("Gamebean");
}
and if there's no difference what method is better ? Cheers.
回答1:
The @ManagedProperty way will autocreate bean if it doesn't exist yet. The getSessionMap() way won't and may thus return null if bean isn't (auto)created beforehand.
The code which achieves the same with least effort and concern is better.
来源：https://stackoverflow.com/questions/34250255/difference-between-managedproperty-and-facescontext-getcurrentinstance-getext