How to get the listening port number of java web application

If it's on a jsp page

& lt%

int？ Port? =? request . getserverport()；

%> If it is in the java code of the controller layer,

int？ Port? =? request . getserverport()； ? //springMVCrequest as parameter or servlet as controller.

int？ Port? =? servletactioncontext . get request()。 getserver port()； ? ///Does Struts 2 Version 2 know this request? Basic knowledge of java WEB development

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