devcsrj · November 2, 2015 01:25 · Nov 2, 2015
diff --git a/ApplicationStartupListener.java b/ApplicationStartupListener.java
@@ -0,0 +1,60 @@
+import java.lang.management.ManagementFactory;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import javax.management.AttributeNotFoundException;
+import javax.management.InstanceNotFoundException;
+import javax.management.MBeanException;
+import javax.management.MBeanServer;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+import javax.management.Query;
+import javax.management.ReflectionException;
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+
+/**
+ * Taken from {@link http://stackoverflow.com/questions/3867197/get-the-server-port-number-from-tomcat-with-out-a-request}
+ */
+public class ApplicationStartupListener implements ServletContextListener {
+
+    @Override
+    public void contextInitialized( ServletContextEvent sce ) {
+        List<String> endpoints = getEndpoints();
+
+        System.out.println( endpoints );
+        // prints [https://127.0.1.1:8443, http://127.0.1.1:8080]
+    }
+
+    @Override
+    public void contextDestroyed( ServletContextEvent sce ) {
+    }
+
+    private List<String> getEndPoints() {
+        try {
+            MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
+            Set<ObjectName> objs = mbs.queryNames( new ObjectName( "*:type=Connector,*" ),
+                    Query.match( Query.attr( "protocol" ), Query.value( "HTTP/1.1" ) ) );
+            String hostname = InetAddress.getLocalHost().getHostName();
+            InetAddress[] addresses = InetAddress.getAllByName( hostname );
+            ArrayList<String> endPoints = new ArrayList<>();
+            for ( ObjectName obj : objs ) {
+                String scheme = mbs.getAttribute( obj, "scheme" ).toString();
+                String port = obj.getKeyProperty( "port" );
+                for ( InetAddress addr : addresses ) {
+                    String host = addr.getHostAddress();
+                    String ep = scheme + "://" + host + ":" + port;
+                    endPoints.add( ep );
+                }
+            }
+            return endPoints;
+        } catch ( MalformedObjectNameException | UnknownHostException | MBeanException | AttributeNotFoundException | InstanceNotFoundException | ReflectionException ex ) {
+            ex.printStackTrace();
+            return new ArrayList<>();
+        }
+    }
+
+}