Support wildcards in @PropertySource

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -16,9 +16,11 @@
 
 package org.springframework.context.annotation;
 
+import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.lang.annotation.Annotation;
+import java.net.URL;
 import java.net.UnknownHostException;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
@@ -35,6 +37,8 @@
 import java.util.Set;
 import java.util.StringJoiner;
 import java.util.function.Predicate;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -455,6 +459,8 @@ private void processPropertySource(AnnotationAttributes propertySource) throws I
 		PropertySourceFactory factory = (factoryClass == PropertySourceFactory.class ?
 				DEFAULT_PROPERTY_SOURCE_FACTORY : BeanUtils.instantiateClass(factoryClass));
 
+		locations = getWildcardLocations(locations);
+
 		for (String location : locations) {
 			try {
 				String resolvedLocation = this.environment.resolveRequiredPlaceholders(location);
@@ -475,6 +481,32 @@ private void processPropertySource(AnnotationAttributes propertySource) throws I
 		}
 	}
 
+	/**
+	 * Parse locations and expand those with wildcard
+	 */
+	private String[] getWildcardLocations(String[] locations) throws IOException {
+		List<String> filesNames = new ArrayList<>();
+		Pattern allFiles = Pattern.compile("(.*[/:])\\*(\\.[a-zA-Z0-9]*)$");
+		for(String location : locations){
+			Matcher matcher = allFiles.matcher(location);
+			if(matcher.matches()){
+				String folderName = matcher.group(1);
+				String extension = matcher.group(2);
+				File folder = this.resourceLoader.getResource(folderName).getFile();
+				File[] files = folder.listFiles();
+				for (File file : files){
+					if(file.getName().endsWith(extension)){
+						filesNames.add("file:"+file.getPath());
+					}
+				}
+			} else {
+				filesNames.add(location);
+			}
+		}
+
+		return filesNames.toArray(new String[filesNames.size()]);
+	}
+
 	private void addPropertySource(PropertySource<?> propertySource) {
 		String name = propertySource.getName();
 		MutablePropertySources propertySources = ((ConfigurableEnvironment) this.environment).getPropertySources();

spring-context/src/main/java/org/springframework/context/annotation/PropertySource.java

@@ -59,6 +59,28 @@
  * configuration class and then used when populating the {@code TestBean} object. Given
  * the configuration above, a call to {@code testBean.getName()} will return "myTestBean".
  *
+ * <p>Given a folder with several files with the same extension containing the key/value pair
+ * {@code testbean.name=myTestBean}, the following {@code @Configuration} class
+ * uses {@code @PropertySource} to contribute all {@code *.properties} to the
+ * {@code Environment}'s set of {@code PropertySources}.</p>
+ *
+ *
+ * <pre class="code">
+ * &#064;Configuration
+ * &#064;PropertySource("classpath:/com/myco/*.properties")
+ * public class AppConfig {
+ *
+ *     &#064;Autowired
+ *     Environment env;
+ *
+ *     &#064;Bean
+ *     public TestBean testBean() {
+ *         TestBean testBean = new TestBean();
+ *         testBean.setName(env.getProperty("testbean.name"));
+ *         return testBean;
+ *     }
+ * }</pre>
+ *
  * <h3>Resolving <code>${...}</code> placeholders in {@code <bean>} and {@code @Value} annotations</h3>
  *
  * <p>In order to resolve ${...} placeholders in {@code <bean>} definitions or {@code @Value}
@@ -156,12 +178,12 @@
  * @author Juergen Hoeller
  * @author Phillip Webb
  * @author Sam Brannen
- * @since 3.1
  * @see PropertySources
  * @see Configuration
  * @see org.springframework.core.env.PropertySource
  * @see org.springframework.core.env.ConfigurableEnvironment#getPropertySources()
  * @see org.springframework.core.env.MutablePropertySources
+ * @since 3.1
  */
 @Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
@@ -172,6 +194,7 @@
 	/**
 	 * Indicate the name of this property source. If omitted, a name will
 	 * be generated based on the description of the underlying resource.
+	 *
 	 * @see org.springframework.core.env.PropertySource#getName()
 	 * @see org.springframework.core.io.Resource#getDescription()
 	 */
@@ -197,22 +220,25 @@
 	 * ignored.
 	 * <p>{@code true} is appropriate if the properties file is completely optional.
 	 * Default is {@code false}.
+	 *
 	 * @since 4.0
 	 */
 	boolean ignoreResourceNotFound() default false;
 
 	/**
 	 * A specific character encoding for the given resources, e.g. "UTF-8".
+	 *
 	 * @since 4.3
 	 */
 	String encoding() default "";
 
 	/**
 	 * Specify a custom {@link PropertySourceFactory}, if any.
 	 * <p>By default, a default factory for standard resource files will be used.
-	 * @since 4.3
+	 *
 	 * @see org.springframework.core.io.support.DefaultPropertySourceFactory
 	 * @see org.springframework.core.io.support.ResourcePropertySource
+	 * @since 4.3
 	 */
 	Class<? extends PropertySourceFactory> factory() default PropertySourceFactory.class;