Decode resourcePath for classpath locations

Closes gh-22272

spring-webflux/src/test/java/org/springframework/web/reactive/resource/PathResourceResolverTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -22,6 +22,7 @@ import java.util.List;
 import org.junit.Test;
 
 import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.FileUrlResource;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.UrlResource;
 
@@ -64,6 +65,22 @@ public class PathResourceResolverTests {
 		assertNotNull(actual);
 	}
 
+	@Test // gh-22272
+	public void resolveWithEncodedPath() throws IOException {
+		Resource classpathLocation = new ClassPathResource("test/", PathResourceResolver.class);
+		testWithEncodedPath(classpathLocation);
+		testWithEncodedPath(new FileUrlResource(classpathLocation.getURL()));
+	}
+
+	private void testWithEncodedPath(Resource location) throws IOException {
+		String path = "foo%20foo.txt";
+		List<Resource> locations = singletonList(location);
+		Resource actual = this.resolver.resolveResource(null, path, locations, null).block(TIMEOUT);
+
+		assertNotNull(actual);
+		assertEquals("foo foo.txt", actual.getFile().getName());
+	}
+
 	@Test
 	public void checkResource() throws IOException {
 		Resource location = new ClassPathResource("test/", PathResourceResolver.class);

spring-webflux/src/test/resources/org/springframework/web/reactive/resource/test/foo foo.txt

@@ -0,0 +1 @@
+Also some text.