Web过滤器中访问会话范围的JSF托管Bean [英] Access session scoped JSF managed bean in web filter

问题描述

我有一个名为userSession的SessionScoped bean来跟踪用户(用户名，ifLogged等).我想过滤一些页面，因此我需要从我创建的webFilter中访问bean.我怎么做?我看起来甚至不可能导入该bean，使其具有潜在的可见性.

I have SessionScoped bean called userSession to keep track of the user ( username, ifLogged, etc). I want to filter some pages and therefore I need to access the bean from the webFilter I created. How do I do that? I looks like its even impossible to import the bean to be potenitally visible.

推荐答案

在幕后，JSF将会话范围的托管bean作为

Under the covers, JSF stores session scoped managed beans as an attribute of the HttpSession with the managed bean name as key.

因此，假设您拥有@ManagedBean @SessionScoped public class User {}，则只需在doFilter()方法内部执行此操作即可

So, provided that you've a @ManagedBean @SessionScoped public class User {}, just this should do inside the doFilter() method:

HttpSession session = ((HttpServletRequest) request).getSession(false);
User user = (session != null) ? (User) session.getAttribute("user") : null;

if (user != null && user.isLoggedIn()) {
    // Logged in.
}

或者，如果您实际上是在使用CDI而不是JSF来管理bean，那么直接在过滤器中直接使用@Inject.

Or, if you're actually using CDI instead of JSF to manage beans, then just use @Inject directly in the filter.

• 在任何与Servlet相关的类中按名称获取JSF托管Bean
• 防止访问受限页面而不登录Jsf2

• Get JSF managed bean by name in any Servlet related class
• Prevent accessing restricted page without login in Jsf2

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