JSF中是否有类似ServletContextListener的东西? | F中是否有类似ServletContextListener的东西

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问题描述

我想听听JSF应用程序是通过普通Servlet Web应用程序中的ServletContextListener启动还是停止的.我该如何实现?

I would like to listen if a JSF application is started or stopped like as possible with a ServletContextListener in a plain Servlet web application. How can I achieve this?

推荐答案

您可以使用 @ApplicationScoped @ManagedBean 会被初始化，并使用 @PostConstruct 和 @PreDestroy .

You can use an @ApplicationScoped @ManagedBean which is eagerly initialized and annotate the desired startup/shutdown hook methods with @PostConstruct and @PreDestroy respectively.

所以:

@ManagedBean(eager=true)
@ApplicationScoped
public class App {

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

    @PreDestroy
    public void destroy() {
        // ...
    }

}

请注意，这不并不意味着您不能在JSF Web应用程序中使用ServletContextListener. JSF建立在Servlet API之上，因此，您可以继续使用它.使用新的Servlet 3.0 @WebListener 批注，也可以配置它而无需web.xml:

Please note that this does not mean that you can't use a ServletContextListener in a JSF webapp. JSF is built on top of the Servlet API which thus means that you could just continue using it. With the new Servlet 3.0 @WebListener annotation, it's also possible to configure it without need for web.xml:

@WebListener
public class Config implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent event) {
        // ...
    }

    @Override
    public void contextDestroyed(ServletContextEvent event) {
        // ...
    }

}

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