Document configuring multiple connectors with Jetty

See gh-17144

Signed-off-by: zxuhan7 <zxuhan7@gmail.com>

Author: zxuhan

spring-boot-project/spring-boot-docs/build.gradle

@@ -105,6 +105,7 @@ dependencies {
 	implementation("org.apache.tomcat.embed:tomcat-embed-core")
 	implementation("org.assertj:assertj-core")
 	implementation("org.cache2k:cache2k-spring")
+	implementation("org.eclipse.jetty:jetty-server")
 	implementation("org.apache.groovy:groovy")
 	implementation("org.glassfish.jersey.containers:jersey-container-servlet-core")
 	implementation("org.glassfish.jersey.core:jersey-server")

spring-boot-project/spring-boot-docs/src/docs/antora/modules/how-to/pages/webserver.adoc

@@ -520,6 +520,15 @@ include-code::MyTomcatConfiguration[]
 
 
 
+[[howto.webserver.enable-multiple-connectors-in-jetty]]
+== Enable Multiple Connectors with Jetty
+
+You can register additional Jetty javadoc:org.eclipse.jetty.server.Connector[] instances by adding a javadoc:org.springframework.boot.jetty.JettyServerCustomizer[] to the javadoc:org.springframework.boot.jetty.ConfigurableJettyWebServerFactory[], as shown in the following example:
+
+include-code::MyJettyConfiguration[]
+
+
+
 [[howto.webserver.enable-tomcat-mbean-registry]]
 == Enable Tomcat's MBean Registry
 

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/howto/webserver/enablemultipleconnectorsinjetty/MyJettyConfiguration.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.howto.webserver.enablemultipleconnectorsinjetty;
+
+import org.eclipse.jetty.server.ServerConnector;
+
+import org.springframework.boot.web.embedded.jetty.ConfigurableJettyWebServerFactory;
+import org.springframework.boot.web.server.WebServerFactoryCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration(proxyBeanMethods = false)
+public class MyJettyConfiguration {
+
+	@Bean
+	public WebServerFactoryCustomizer<ConfigurableJettyWebServerFactory> connectorCustomizer() {
+		return (jetty) -> jetty.addServerCustomizers((server) -> {
+			ServerConnector connector = new ServerConnector(server);
+			connector.setPort(8081);
+			server.addConnector(connector);
+		});
+	}
+
+}