如何使Tomcat中的所有会话失效？

Question

我想在Tomcat中使所有会话失效.我们在Fitnesse下测试我们的产品,并且一些会话仍然存在,并且会话结束导致测试之间的依赖性.我使用以下代码手动执行,但仍保留一些会话(我可以使用http:// localhost:8080/manager/html/list url进行检查)

public static void expireAllSessions() {
    String[] applications = { "a", "b", "c", "d",  "e" };
    for (String application : applications) {
        try {
            expireAllSessions(application);
        } catch (Exception e) {
            logger.error(e);
        }
    }
}

private static void expireAllSessions(final String application) throws Exception {
    // cf doc http://hc.apache.org/httpclient-3.x/authentication.html
    HttpClient client = new HttpClient();
    client.getParams().setAuthenticationPreemptive(true);
    Credentials userPassword = new UsernamePasswordCredentials("tomcat", "tomcat");
    client.getState().setCredentials(AuthScope.ANY, userPassword);

    String url = "http://localhost:8080/manager/html/expire";
    NameValuePair[] parametres = new NameValuePair[] {
            new NameValuePair("path", "/" + application),
            new NameValuePair("idle", "0")
    };
    HttpMethod method = new GetMethod(url);
    method.setQueryString(parametres);
    client.executeMethod(method);
}

有没有办法在没有剩余会话的情况下更高效,更直接地做到这一点？

Answer 1

我假设您的应用程序确实是独立的上下文.我已经做了一些类似于你要求的HttpSessionListener用于每个上下文的东西.这里棘手的部分是你需要一个由根类加载器加载的Session Collection,而不是上下文类加载器.这就是我记忆中的方式:

创建一个包含每个上下文的活动会话的类.此类必须驻留在tomcat/lib目录中,以便每个上下文都可以访问它.它不能成为任何环境的一部分.

public class SessionMap {

  private static Map<ServletContext, Set<HttpSession>> map =
    new HashMap<ServletContext, Set<HttpSession>>();

  private SessionMap() {
  }

  public static Map<ServletContext, Set<HttpSession>> getInstance() {
    return map;
  }

  public static void invalidate(String[] contexts) {
    synchronized (map) {
      List<String> l = Arrays.asList(contexts);     
      for (Map.Entry<ServletContext, Set<HttpSession>> e : map.entrySet()) {
        // context name without the leading slash
        String c = e.getKey().getContextPath().substring(1);
        if (l.contains(c)) {
          for (HttpSession s : e.getValue()) 
            s.invalidate();
        }
      }
    }
  }

}

为每个上下文创建一个监听器.

public class ApplicationContextListener implements HttpSessionListener {

  public void sessionCreated(HttpSessionEvent event) {
    ConcurrentMap<ServletContext, Set<HttpSession>> instance = SessionMap.getInstance();
    synchronized (instance) {
      ServletContext c = event.getSession().getServletContext();
      Set<HttpSession> set = instance.get(c);
      if (c == null) {
        set = new HashSet<HttpSession>();
        instance.put(c, set);
      }
      set.add(event.getSession());
    }
  }

  public void sessionDestroyed(HttpSessionEvent event) {
    ConcurrentMap<ServletContext, Set<HttpSession>> instance = SessionMap.getInstance();
    synchronized (map) {
      ServletContext c = event.getSession().getServletContext();
      Set<HttpSession> set = instance.get(c);
      if (c != null) {
        set.remove(event.getSession());
      }
    }
  }

}

在相应的上下文中注册每个监听器web.xml.

<listener>
  <listener-class>ApplicationContextListener</listener-class>
</listener>

然后,您可以调用以下行以使任何上下文中的所有内容无效.

SessionMap.invalidate();

我在地图上同步只是为了安全起见.