如何初始化Java FacesServlet [英] How can I initialize a Java FacesServlet

问题描述

我需要在FacesServlet启动时运行一些代码，但是当FacesServlet被声明为final时，我无法扩展它并覆盖init（）方法。

I need to run some code when the FacesServlet starts, but as FacesServlet is declared final I can not extend it and overwrite the init() method.

特别是，我希望在开发和测试期间，在hibernate删除并创建数据模型后，将一些数据写入数据库。

In particular, I want to write some data to the database during development and testing, after hibernate has dropped and created the datamodel.

有没有办法配置Faces来运行某些方法，例如在faces-config.xml中？
或者最好创建一个执行初始化的单例bean吗？

Is there a way to configure Faces to run some method, e.g. in faces-config.xml? Or is it best to create a singleton bean that does the initialization?

推荐答案

使用急切地初始化 应用程序范围 托管bean 。

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

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

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

}

（类和方法名称实际上无关紧要，你可以免费使用选择，所有关于注释）

这是有保证的在启动 FacesServlet 后构建，因此 FacesContext 将随时可用必要。这与其他答案所建议的 ServletContextListener 相反。

This is guaranteed to be constructed after the startup of the FacesServlet, so the FacesContext will be available whenever necessary. This in contrary to the ServletContextListener as suggested by the other answer.

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