How to invoke a method on a managed bean when pressing backbutton or F5?

Question

当按下backbutton或F5时，如何在托管bean上调用方法？

Answer 1

If the bean is request scoped and the page is served with response headers which instructs the browser to not cache the page, then you can do that job in the bean's constructor or @PostConstruct method.

Eg

public class Bean {

    public Bean() {
        // Here, in the constructor.
    }

    @PostConstruct
    public void init() {
        // Or here, in the postconstructor.
    }

}

The @PostConstruct method is particularly useful if you're injecting dependencies by @ManagedProperty , @EJB or @Inject , etc and want to do the initialization job based on those dependencies.