在会话作用域的JSF中请求作用域的属性

Question

The application that I'm working on uses a huge legacy bean that is session scoped. The problem is I can't refactor the code and I need some attributes to be request scoped. Is there any way to achieve that?

Answer 1

You could have a @RequestScoped bean, inject the legacy session scoped bean by using @ManagedProperty and use @PostConstruct to retrieve the attributes you need.

For example:

@ManagedBean(name = "legacyBean")
@SessionScoped
public class LegacyBean implements Serializable {
    private Object attr1;
    private Object attr2;

    // Getters and setters
}

@ManagedBean(name = "requestScopedBean")
@RequestScoped
public class RequestScopedBean {
    private Object requestAttr1;

    @ManagedProperty(value = "#{legacyBean}")
    private LegacyBean legacyBean;

    @PostConstruct
    private void init() {
        this.requestAttr1 = legacyBean.getAttr1();
    }

    public Object getRequestAttr1() {
        return this.requestAttr1 ;
    }
}