Add an accessor for webEnvironment to SpringApplication

Closes gh-6241

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

@@ -928,6 +928,15 @@ public class SpringApplication {
 		this.mainApplicationClass = mainApplicationClass;
 	}
 
+	/**
+	 * Returns whether this {@link SpringApplication} is running within a web environment.
+	 * @return {@code true} if running within a web environment, otherwise {@code false}.
+	 * @see #setWebEnvironment(boolean)
+	 */
+	public boolean isWebEnvironment() {
+		return this.webEnvironment;
+	}
+
 	/**
 	 * Sets if this application is running within a web environment. If not specified will
 	 * attempt to deduce the environment based on the classpath.