Java Google Guice web应用程序中的HttpSessionListener

我需要执行一个操作，当Guice Servlet会话过期时，该操作将访问中的项。（为什么？检查要销毁的会话的打开的websocket连接并关闭它们；这些连接保存在

ServletContext

中）

为了在基本的Servlet web应用程序中实现这一点，需要实现一个and，并将其挂接到

sessionDestroyed

方法中

对于使用依赖注入的web应用程序，如何实现这一点

---

回想一下能够访问

ServletContext

的要求；我已经遇到过，但没有发现它有什么帮助。

没有添加会话侦听器的“Guice方法”。悲哀地但是从会话侦听器访问servlet上下文没有问题

注册会话侦听器：

public class MyServletConfig extends GuiceServletContextListener {
    private Injector    injector;

    @Override
    public void contextInitialized(final ServletContextEvent servletContextEvent) {
        injector = Guice.createInjector(new MyAppModule());

        registerSessionListeners(servletContextEvent.getServletContext(), injector);

        super.contextInitialized(servletContextEvent);
    }

    private void registerSessionListeners(final ServletContext servletContext, final Injector injector) {
        servletContext.addListener(injector.getInstance(WebsocketCloser.class));
    }

    @Override
    protected Injector getInjector() {
        return injector;
    }

}

public class WebsocketCloser implements HttpSessionListener {
    @Override
    public void sessionCreated(final HttpSessionEvent httpSessionEvent) {
        // no-op
    }

    @Override
    public void sessionDestroyed(final HttpSessionEvent httpSessionEvent) {
        // do cleanup: httpSessionEvent.getSession().getServletContext();
    }
}

访问servlet上下文是会话侦听器：

public class MyServletConfig extends GuiceServletContextListener {
    private Injector    injector;

    @Override
    public void contextInitialized(final ServletContextEvent servletContextEvent) {
        injector = Guice.createInjector(new MyAppModule());

        registerSessionListeners(servletContextEvent.getServletContext(), injector);

        super.contextInitialized(servletContextEvent);
    }

    private void registerSessionListeners(final ServletContext servletContext, final Injector injector) {
        servletContext.addListener(injector.getInstance(WebsocketCloser.class));
    }

    @Override
    protected Injector getInjector() {
        return injector;
    }

}

public class WebsocketCloser implements HttpSessionListener {
    @Override
    public void sessionCreated(final HttpSessionEvent httpSessionEvent) {
        // no-op
    }

    @Override
    public void sessionDestroyed(final HttpSessionEvent httpSessionEvent) {
        // do cleanup: httpSessionEvent.getSession().getServletContext();
    }
}