TA貢獻1784條經驗 獲得超2個贊
ServletContextListener@WebListenerpublic class Config implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
// Do stuff during webapp's startup.
}
public void contextDestroyed(ServletContextEvent event) {
// Do stuff during webapp's shutdown.
}}@WebListener/WEB-INF/web.xml
<listener> <listener-class>com.example.Config</listener-class></listener>
ServletContext#setAttribute()#getAttribute().
public void contextInitialized(ServletContextEvent event) {
event.getServletContext().setAttribute("config", this);
// ...
} protected void doGet(HttpServletRequest request, HttpServletResponse response) {
Config config = (Config) getServletContext().getAttribute("config");
// ...
}${config}
@ObservesApplicationScoped.classimport javax.enterprise.context.ApplicationScoped;@ApplicationScopedpublic class Config {
public void init(@Observes @Initialized(ApplicationScoped.class) ServletContext context) {
// Do stuff during webapp's startup.
}
public void destroy(@Observes @Destroyed(ApplicationScoped.class) ServletContext context) {
// Do stuff during webapp's shutdown.
}}@Inject@Named#{config}
@ManagedBean(eager=true)import javax.faces.bean.ManagedBeanimport javax.faces.bean.ApplicationScoped;@ManagedBean(eager=true)@ApplicationScopedpublic class Config {
@PostConstruct
public void init() {
// Do stuff during webapp's startup.
}
@PreDestroy
public void destroy() {
// Do stuff during webapp's shutdown.
}}#{config}
@Startup@Singleton@Startup@Singletonpublic class Config {
@PostConstruct
public void init() {
// Do stuff during webapp's startup.
}
@PreDestroy
public void destroy() {
// Do stuff during webapp's shutdown.
}}@EJB@Singleton
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