Register printed banner in ApplicationContext

Update SpringApplication to store the banner that was actually printed
as a bean named `springBootBanner`.

Closes gh-5636

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

@@ -94,6 +94,9 @@ You can also use the `spring.main.banner-mode` property to determine if the bann
 to be printed on `System.out` (`console`), using the configured logger (`log`) or not
 at all (`off`).
 
+The printed banner will be registered as a singleton bean under the name
+`springBootBanner`.
+
 [NOTE]
 ====
 YAML maps `off` to `false` so make sure to add quotes if you want to disable the

spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -139,6 +139,7 @@ import org.springframework.web.context.support.StandardServletEnvironment;
  * @author Stephane Nicoll
  * @author Jeremy Rickard
  * @author Craig Burke
+ * @author Michael Simons
  * @see #run(Object, String[])
  * @see #run(Object[], String[])
  * @see #SpringApplication(Object...)
@@ -200,6 +201,8 @@ public class SpringApplication {
 
 	private Banner banner;
 
+	private boolean printedCustomBannerViaDeprecatedMethod;
+
 	private ResourceLoader resourceLoader;
 
 	private BeanNameGenerator beanNameGenerator;
@@ -304,11 +307,10 @@ public class SpringApplication {
 					args);
 			ConfigurableEnvironment environment = prepareEnvironment(listeners,
 					applicationArguments);
-			if (this.bannerMode != Banner.Mode.OFF) {
-				printBanner(environment);
-			}
+			Banner printedBanner = printBanner(environment);
 			context = createApplicationContext();
-			prepareContext(context, environment, listeners, applicationArguments);
+			prepareContext(context, environment, listeners, applicationArguments,
+					printedBanner);
 			refreshContext(context);
 			afterRefresh(context, applicationArguments);
 			listeners.finished(context, null);
@@ -340,7 +342,7 @@ public class SpringApplication {
 
 	private void prepareContext(ConfigurableApplicationContext context,
 			ConfigurableEnvironment environment, SpringApplicationRunListeners listeners,
-			ApplicationArguments applicationArguments) {
+			ApplicationArguments applicationArguments, Banner printedBanner) {
 		context.setEnvironment(environment);
 		postProcessApplicationContext(context);
 		applyInitializers(context);
@@ -353,6 +355,9 @@ public class SpringApplication {
 		// Add boot specific singleton beans
 		context.getBeanFactory().registerSingleton("springApplicationArguments",
 				applicationArguments);
+		if (printedBanner != null) {
+			context.getBeanFactory().registerSingleton("springBootBanner", printedBanner);
+		}
 
 		// Load the sources
 		Set<Object> sources = getSources();
@@ -530,6 +535,29 @@ public class SpringApplication {
 		environment.setActiveProfiles(profiles.toArray(new String[profiles.size()]));
 	}
 
+	private Banner printBanner(ConfigurableEnvironment environment) {
+		if (printBannerViaDeprecatedMethod(environment)) {
+			return null;
+		}
+		if (this.bannerMode == Banner.Mode.OFF) {
+			return null;
+		}
+		ResourceLoader resourceLoader = this.resourceLoader != null ? this.resourceLoader
+				: new DefaultResourceLoader(getClassLoader());
+		SpringApplicationBannerPrinter bannerPrinter = new SpringApplicationBannerPrinter(
+				resourceLoader, this.banner);
+		if (this.bannerMode == Mode.LOG) {
+			return bannerPrinter.print(environment, this.mainApplicationClass, logger);
+		}
+		return bannerPrinter.print(environment, this.mainApplicationClass, System.out);
+	}
+
+	private boolean printBannerViaDeprecatedMethod(Environment environment) {
+		this.printedCustomBannerViaDeprecatedMethod = true;
+		printBanner(environment);
+		return this.printedCustomBannerViaDeprecatedMethod;
+	}
+
 	/**
 	 * Print a custom banner message to the console, optionally extracting its location or
 	 * content from the Environment (banner.location and banner.charset). The defaults are
@@ -537,18 +565,11 @@ public class SpringApplication {
 	 * not exist or cannot be printed, a simple default is created.
 	 * @param environment the environment
 	 * @see #setBannerMode
+	 * @deprecated as of 1.4 in favor of @{@link #setBanner(Banner)}
 	 */
+	@Deprecated
 	protected void printBanner(Environment environment) {
-		ResourceLoader resourceLoader = this.resourceLoader != null ? this.resourceLoader
-				: new DefaultResourceLoader(getClassLoader());
-		SpringApplicationBannerPrinter banner = new SpringApplicationBannerPrinter(resourceLoader,
-				this.banner);
-		if (this.bannerMode == Mode.LOG) {
-			banner.print(environment, this.mainApplicationClass, logger);
-		}
-		else {
-			banner.print(environment, this.mainApplicationClass, System.out);
-		}
+		this.printedCustomBannerViaDeprecatedMethod = false;
 	}
 
 	/**

spring-boot/src/main/java/org/springframework/boot/SpringApplicationBannerPrinter.java

@@ -55,7 +55,7 @@ class SpringApplicationBannerPrinter {
 		this.fallbackBanner = fallbackBanner;
 	}
 
-	public void print(Environment environment, Class<?> sourceClass, Log logger) {
+	public Banner print(Environment environment, Class<?> sourceClass, Log logger) {
 		Banner banner = getBanner(environment, this.fallbackBanner);
 		try {
 			logger.info(createStringFromBanner(banner, environment, sourceClass));
@@ -63,11 +63,13 @@ class SpringApplicationBannerPrinter {
 		catch (UnsupportedEncodingException ex) {
 			logger.warn("Failed to create String for banner", ex);
 		}
+		return banner;
 	}
 
-	public void print(Environment environment, Class<?> sourceClass, PrintStream out) {
+	public Banner print(Environment environment, Class<?> sourceClass, PrintStream out) {
 		Banner banner = getBanner(environment, this.fallbackBanner);
 		banner.printBanner(environment, sourceClass, out);
+		return banner;
 	}
 
 	private Banner getBanner(Environment environment, Banner definedBanner) {

spring-boot/src/test/java/org/springframework/boot/BannerTests.java

@@ -22,6 +22,7 @@ import org.junit.After;
 import org.junit.Rule;
 import org.junit.Test;
 
+import org.springframework.boot.Banner.Mode;
 import org.springframework.boot.testutil.InternalOutputCapture;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Configuration;
@@ -34,6 +35,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Phillip Webb
  * @author Michael Stummvoll
+ * @author Michael Simons
  */
 public class BannerTests {
 
@@ -74,6 +76,49 @@ public class BannerTests {
 		assertThat(this.out.toString()).contains("My Banner");
 	}
 
+	@Test
+	public void testBannerInContext() throws Exception {
+		SpringApplication application = new SpringApplication(Config.class);
+		application.setWebEnvironment(false);
+		this.context = application.run();
+		assertThat(this.context.containsBean("springBootBanner")).isTrue();
+	}
+
+	@Test
+	public void testCustomBannerInContext() throws Exception {
+		SpringApplication application = new SpringApplication(Config.class);
+		application.setWebEnvironment(false);
+		final DummyBanner dummyBanner = new DummyBanner();
+		application.setBanner(dummyBanner);
+		this.context = application.run();
+		assertThat(this.context.getBean("springBootBanner")).isEqualTo(dummyBanner);
+	}
+
+	@Test
+	public void testDisableBannerInContext() throws Exception {
+		SpringApplication application = new SpringApplication(Config.class);
+		application.setBannerMode(Mode.OFF);
+		application.setWebEnvironment(false);
+		this.context = application.run();
+		assertThat(this.context.containsBean("springBootBanner")).isFalse();
+	}
+
+	@Test
+	public void testDeprecatePrintBanner() throws Exception {
+		SpringApplication application = new SpringApplication(Config.class) {
+
+			@Override
+			protected void printBanner(Environment environment) {
+				System.out.println("I printed a deprecated banner");
+			};
+
+		};
+		application.setWebEnvironment(false);
+		this.context = application.run();
+		assertThat(this.out.toString()).contains("I printed a deprecated banner");
+		assertThat(this.context.containsBean("springBootBanner")).isFalse();
+	}
+
 	static class DummyBanner implements Banner {
 
 		@Override