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

Question

嗨，我有一个运行在Tomcat中的应用程序以及Weblogic和Websphere，我需要确定该应用程序正在运行哪个端口并显示在UI上，是否有任何JAVA api可以找到该应用程序

Answer 1

如果您的应用程序已经通过该端口访问，则可以轻松地从HttpServletRequest获取它。

Answer 2

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 3

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...)