Find the port of the server the application is running in java

Question

Hi I have an application running in tomcat,as well as Weblogic and Websphere I need to determine which port the application is running and display on the UI Is there any JAVA api to find that

Answer 1

If your application is already accessed through that port, you can easily get it from HTTPRequest.

Answer 2

Well, ServletRequest#getServerPort(), but in order to open your application the users must know the port in advance, so that wouldn't be very useful.

Answer 3

As mentioned by inkredibl the ServletRequest method getServerPort provides this information:

Returns the port number to which the request was sent. It is the value of the part after ":" in the Host header value, if any, or the server port where the client connection was accepted on.

Answer 4

You can't ask a server from the outside for which ports are used by which application. (Ahh, you cam try, but it shouldn't tell). That's obviously a security feature (you could start a port scan, but I guess, that's not exactly what you want...or?)

So the only way out - the application needs to communicate its port number to outer space, either by a simple web page, where the actual port number is desplayed (human-machine-interface) or a separate webservice with a static port number, where a client can request the actual server properties (machine-machine-interface).

(Note: I assumed, the 'UI' is a client application...)

Answer 5

Is there any Tomcat API or configuration available which can tell an application (probably on startup), what port its running on without a request??