Vaadin关闭另一个浏览器/标签/系统中同一用户的UI [英] Vaadin close UI of same user in another browser/tab/system

问题描述

我正在Vaadin 7中做一个项目.因此，我需要实现以下类似的登录名.

I'm doing a project in Vaadin 7. In that I need to implement something like below for the login.

用户'A'登录到系统'1'.然后他再次登录到另一个系统"2".现在，我想知道如何在系统"1"上关闭用户界面.

A user 'A' is logged in to a system '1'. And again he logs into another system '2'. Now I want to know how to close the UI on the system '1'.

我尝试了一些操作，并且可以关闭UI(如果是同一浏览器).但是，对于不同的系统/浏览器.我不知道.

I tried something and can able to close the UI, If it is the same browser. But, for different systems/browser. I don't have any idea.

我的代码:

private void closeUI(String attribute) {
        for (UI ui : getSession().getUIs()) {
            if(ui.getSession().getAttribute(attribute) != null)
                   if(ui.getSession().getAttribute(attribute).equals(attribute))
                         ui.close();

            }
}

有人可以帮我吗?

推荐答案

我遇到的情况与您类似，需要显示有关所有会话的多个信息.我所做的是创建了自己的Servlet，使用静态ConcurrentHashmap扩展了VaadinServlet来保存我的会话信息，并使用SessionDestroyListener退出后从地图上删除了任何信息.最初，我还有一个SessionInitListener，我在哈希图中添加了信息，但是我意识到身份验证后只有用户信息，所以我将这一部分移到了处理登录的页面上.

I have a situation similar to your where I need to display several info regarding all sessions. What I did was I created my own Servlet extending the VaadinServlet with a static ConcurrentHashmap to save my sessions info, and a SessionDestroyListener to remove any info from the map upon logout. Initially I also had a SessionInitListener where I added the info in the hashmap but I realized I only had the user information after authentication so I moved this part to the page handling the login.

我想您可以做类似的事情，或者至少这应该使您入门:

I guess you could do something similar, or at least this should get you started:

public class SessionInfoServlet extends VaadinServlet {

  private static final ConcurrentHashMap<User, VaadinSession> userSessionInfo = new ConcurrentHashMap<>();

  // this could be called after login to save the session info
  public static void saveUserSessionInfo(User user, VaadinSession session) {
    VaadinSession oldSession = userSessionInfo.get(user);
    if(oldSession != null){
      // close the old session
      oldSession.close();
    }
    userSessionInfo.put(user, session);
  }

  public static Map<User, VaadinSession> getUserSessionInfos() {
    // access the cache if we need to, otherwise useless and removable
    return userSessionInfo;
  }

  @Override
  protected void servletInitialized() throws ServletException {
    super.servletInitialized();
    // register our session destroy listener
    SessionLifecycleListener sessionLifecycleListener = new SessionLifecycleListener();
    getService().addSessionDestroyListener(sessionLifecycleListener);
  }

  private class SessionLifecycleListener implements SessionDestroyListener {
    @Override
    public void sessionDestroy(SessionDestroyEvent event) {
      // remove saved session from cache, for the user that was stored in it
      userSessionInfo.remove(event.getSession().getAttribute("user"));
    }
  }
}

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