Extract code snippets from multipart.adoc

See gh-36175

framework-docs/modules/ROOT/pages/web/webmvc/mvc-servlet/multipart.adoc

@@ -26,43 +26,7 @@ To do so:
 
 The following example shows how to set a `MultipartConfigElement` on the Servlet registration:
 
-[tabs]
-======
-Java::
-+
-[source,java,indent=0,subs="verbatim,quotes"]
-----
-	public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
-
-		// ...
-
-		@Override
-		protected void customizeRegistration(ServletRegistration.Dynamic registration) {
-
-			// Optionally also set maxFileSize, maxRequestSize, fileSizeThreshold
-			registration.setMultipartConfig(new MultipartConfigElement("/tmp"));
-		}
-
-	}
-----
-
-Kotlin::
-+
-[source,kotlin,indent=0,subs="verbatim,quotes"]
-----
-	class AppInitializer : AbstractAnnotationConfigDispatcherServletInitializer() {
-
-		// ...
-
-		override fun customizeRegistration(registration: ServletRegistration.Dynamic) {
-
-			// Optionally also set maxFileSize, maxRequestSize, fileSizeThreshold
-			registration.setMultipartConfig(MultipartConfigElement("/tmp"))
-		}
-
-	}
-----
-======
+include-code::./AppInitializer[tag=snippet,indent=0]
 
 Once the Servlet multipart configuration is in place, you can add a bean of type
 `StandardServletMultipartResolver` with a name of `multipartResolver`.

framework-docs/src/main/java/org/springframework/docs/web/webmvc/mvcservlet/mvcmultipartresolverstandard/AppInitializer.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2002-2025 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.docs.web.webmvc.mvcservlet.mvcmultipartresolverstandard;
+
+import jakarta.servlet.MultipartConfigElement;
+import jakarta.servlet.ServletRegistration;
+import org.jspecify.annotations.Nullable;
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+// tag::snippet[]
+public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
+
+	// @fold:on
+	@Override
+	protected String[] getServletMappings() {
+		/**/throw new UnsupportedOperationException();
+	}
+
+	@Override
+	protected Class<?> @Nullable [] getRootConfigClasses() {
+		/**/throw new UnsupportedOperationException();
+	}
+
+	@Override
+	protected Class<?> @Nullable [] getServletConfigClasses() {
+		/**/throw new UnsupportedOperationException();
+	}
+
+	// @fold:off
+	@Override
+	protected void customizeRegistration(ServletRegistration.Dynamic registration) {
+
+		// Optionally also set maxFileSize, maxRequestSize, fileSizeThreshold
+		registration.setMultipartConfig(new MultipartConfigElement("/tmp"));
+	}
+}
+// end::snippet[]

framework-docs/src/main/kotlin/org/springframework/docs/web/webmvc/mvcservlet/mvcmultipartresolverstandard/AppInitializer.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2002-2025 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.docs.web.webmvc.mvcservlet.mvcmultipartresolverstandard
+
+import jakarta.servlet.MultipartConfigElement
+import jakarta.servlet.ServletRegistration
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer
+
+// tag::snippet[]
+class AppInitializer : AbstractAnnotationConfigDispatcherServletInitializer() {
+
+	// @fold:on
+	override fun getServletMappings(): Array<out String> {
+		/**/TODO("Not yet implemented")
+	}
+
+	override fun getRootConfigClasses(): Array<out Class<*>>? {
+		/**/TODO("Not yet implemented")
+	}
+
+	override fun getServletConfigClasses(): Array<out Class<*>>? {
+		/**/TODO("Not yet implemented")
+	}
+
+	// @fold:off
+	override fun customizeRegistration(registration: ServletRegistration.Dynamic) {
+
+		// Optionally also set maxFileSize, maxRequestSize, fileSizeThreshold
+		registration.setMultipartConfig(MultipartConfigElement("/tmp"))
+	}
+
+}
+// end::snippet[]