Question

我需要写一份普通照会,在接到通知后,将获得关于目前开幕会议名单的信息。

是否有办法这样做?

Answer 1

<http://java.sun.com/javaee/5/docs/api/javax/servlet/http/HttpSessionListener.html>rel=“nofollow noretinger”>HttpSessionListener>>>a>>,给它一个static Set<HttpSession> property,在sessionCreated ()期间,删除了该编码在<>Destroyed(电话)/打上。现在,你召集了一个班级,在目前收集的博览会上举行所有公开会议。这方面的一个基本实例是:

public HttpSessionCollector implements HttpSessionListener {
    private static final Set<HttpSession> sessions = ConcurrentHashMap.newKeySet();

    public void sessionCreated(HttpSessionEvent event) {
        sessions.add(event.getSession());
    }

    public void sessionDestroyed(HttpSessionEvent event) {
        sessions.remove(event.getSession());
    }

    public static Set<HttpSession> getSessions() {
        return sessions;
    }
}

之后,在你的职责中,我们就做了以下工作:

Set<HttpSession> sessions = HttpSessionCollector.getSessions();

如果你想在申请范围内储存/提出,以便你能够制作<代码>Set<HttpSession>non-static,则请上。 HttpSessionCollector 实施 http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletContextListener.html” rel=“nofollow noreferer”>ServletContextstener ><>>>>>>>>>>>>>m>as well<>/em>,基本上添加以下方法:

public void contextCreated(ServletContextEvent event) {
    event.getServletContext().setAttribute("HttpSessionCollector.instance", this);
}

public static HttpSessionCollector getCurrentInstance(ServletContext context) {
    return (HttpSessionCollector) context.getAttribute("HttpSessionCollector.instance");
}

您可在《服务手册》中使用:

HttpSessionCollector collector = HttpSessionCollector.getCurrentInstance(getServletContext());
Set<HttpSession> sessions = collector.getSessions();

Answer 2

也许使用联合数据交换的元件更为可取,不需要密码。仅读作价值

数据:jbos.web: 类型=Manager,path=/myapplication,host= Localhost”活性决定因素

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