会话范围内的JSF bean中的请求范围内的属性 [英] request scoped property in session scoped JSF bean

问题描述

我想让一个会话范围内的JSF bean具有一个请求(页面)范围内的属性.可能吗?

I would like to have a session scoped JSF bean with one property that is request (page) scoped. Is it possible at all?

推荐答案

否，这是不可能的.只能在创建bean的过程中进行托管属性注入.但是，在创建会话范围的bean时，不一定存在请求，并且注入的请求范围的bean在会话的剩余部分中的后续请求中将无效.

No, that's not possible. Managed property injection only happens during creation of the bean. However, when a session scoped bean is been created there is not necessarily a request present and the injected request scoped bean would be invalid in subsequent requests in the remnant of the session.

反之亦然.例如

@ManagedBean
@SessionScoped
public class UserManager {

    private User current;

    // ...
}

和

@ManagedBean
@RequestScoped
public class Login {

    private String username;
    private String password;

    @ManagedProperty(value="#{userManager}")
    private UserManager userManager;

    @EJB
    private UserService userService;

    public String submit() {
        User user = userService.find(username, password);

        if (user != null) {
            userManager.setCurrent(user);
            return "home?faces-redirect=true";
        } else {
            addErrorMessage("Unknown login, please try again");
            return null;
        }
    }

    // ...
}

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