从Tomcat的context.xml中的ServletContext获取sessionCookieName

Question

How could I get the name of session of current request?

The default name of tomcat session is "jsessionid". Given that I have modified the sessionCookieName configuration in context.xml of tomcat as below to gives multiple tomcat instance run on a same server

<Context sessionCookieName="appSessionId">

<!-- Default set of monitored resources. If one of these changes, the    -->
<!-- web application will be reloaded.                                   -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>

<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<!--
<Manager pathname="" />
-->

<!-- Uncomment this to enable Comet connection tacking (provides events
     on session expiration as well as webapp lifecycle) -->
<!--
<Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
-->
</Context>

My web app need to know what the name of session of current request is. I have tried such as:

request.getServletContext().getSessionCookieConfig().getName()
request.getSession().getServletContext().getSessionCookieConfig().getName()

But both of them are null.

My pom.xml as below

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
</dependency>

<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>8.0.23</version>
</dependency>

The tomcat I have used is also 8.0.23, any help is appreciated.

Answer 1

This is pretty confusing, because from what I can tell the following always return null, so I'm not sure what the point in them is!

request.getServletContext().getSessionCookieConfig().getName()
request.getSession().getServletContext().getSessionCookieConfig().getName()

You need to do:

SessionConfig.getSessionCookieName(request.getContext())