如何在Session侦听器或Servlet中的JSF中设置Backing Bean中的值？

Question

在SessionListener我想设置@ManagedBean一些值，其中包含我想在JSF中显示的Session scope 。

Answer 1

You'd need to create the managed bean instance yourself.

Bean bean = new Bean();
bean.setSomething(something);
event.getSession().setAttribute("bean", bean); // "bean" is managed bean name.

JSF will just reuse it if it already exist in the session scope (you see, the JSF "session scope" is under the covers represented by attributes of HttpSession ). Note that this way any @PostConstruct won't be invoked and any dependencies which needs to be injected by @ManagedProperty , @EJB , etc, won't be injected at all. You'd need to do it yourself as well.

Designtechnically, much better is to perform the job just in the constructor or @PostConstruct method of the backing bean class itself.

@ManagedBean
@SessionScoped
public class Bean {

    @PostConstruct
    public void init() {
        // Here.
    }

}