Allow multiple connectors with Tomcat

Update TomcatEmbeddedServletContainerFactory to allow for additional
containers (e.g. SSL or AJP in addition to HTTP).

Fixes gh-528

spring-boot-docs/src/main/asciidoc/howto.adoc

@@ -453,6 +453,44 @@ that sets up the connector to be secure:
 	}
 ----
 
+[[howto-enable-multiple-connectors-in-tomcat]]
+=== Enable Multiple Connectors Tomcat
+Add a `org.apache.catalina.connector.Connector` to the
+`TomcatEmbeddedServletContainerFactory` which can allow multiple connectors eg a HTTP and
+HTTPS connector:
+
+[source,java,indent=0,subs="verbatim,quotes,attributes"]
+----
+	@Bean
+	public EmbeddedServletContainerFactory servletContainer() {
+		TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory();
+		tomcat.addAdditionalTomcatConnectors(createSslConnector());
+		return tomcat;
+	}
+
+	private Connector createSslConnector() {
+		Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
+		Http11NioProtocol protocol = (Http11NioProtocol) connector.getProtocolHandler();
+		try {
+			File keystore = new ClassPathResource("keystore").getFile();
+			File truststore = new ClassPathResource("keystore").getFile();
+			connector.setScheme("https");
+			connector.setSecure(true);
+			connector.setPort(8443);
+			protocol.setSSLEnabled(true);
+			protocol.setKeystoreFile(keystore.getAbsolutePath());
+			protocol.setKeystorePass("changeit");
+			protocol.setTruststoreFile(truststore.getAbsolutePath());
+			protocol.setTruststorePass("changeit");
+			protocol.setKeyAlias("apitester");
+			return connector;
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("can't access keystore: [" + "keystore"
+					+ "] or truststore: [" + "keystore" + "]", ex);
+		}
+	}
+----
 
 
 [[howto-use-jetty-instead-of-tomcat]]