Polishing

spring-core/src/main/java/org/springframework/core/io/UrlResource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -49,6 +49,7 @@ public class UrlResource extends AbstractFileResolvingResource {
 
 	private static final String AUTHORIZATION = "Authorization";
 
+
 	/**
 	 * Original URI, if available; used for URI and File access.
 	 */
@@ -310,7 +311,8 @@ public class UrlResource extends AbstractFileResolvingResource {
 	/**
 	 * This delegate creates a {@code java.net.URL}, applying the given path
 	 * relative to the path of the underlying URL of this resource descriptor.
-	 * A leading slash will get dropped; a "#" symbol will get encoded.
+	 * <p>A leading slash will get dropped; a "#" symbol will get encoded.
+	 * Note that this method effectively cleans the combined path as of 6.1.
 	 * @since 5.2
 	 * @see #createRelative(String)
 	 * @see ResourceUtils#toRelativeURL(URL, String)

spring-core/src/main/java/org/springframework/util/ResourceUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -34,7 +34,7 @@ import org.springframework.lang.Nullable;
  * <p>Consider using Spring's Resource abstraction in the core package
  * for handling all kinds of file resources in a uniform manner.
  * {@link org.springframework.core.io.ResourceLoader}'s {@code getResource()}
- * method can resolve any location to an {@link org.springframework.core.io.Resource}
+ * method can resolve any location to a {@link org.springframework.core.io.Resource}
  * object, which in turn allows one to obtain a {@code java.io.File} in the
  * file system through its {@code getFile()} method.
  *
@@ -101,6 +101,7 @@ public abstract class ResourceUtils {
 	 * @return whether the location qualifies as a URL
 	 * @see #CLASSPATH_URL_PREFIX
 	 * @see java.net.URL
+	 * @see #toURL(String)
 	 */
 	public static boolean isUrl(@Nullable String resourceLocation) {
 		if (resourceLocation == null) {
@@ -126,6 +127,7 @@ public abstract class ResourceUtils {
 	 * "classpath:" pseudo URL, a "file:" URL, or a plain file path
 	 * @return a corresponding URL object
 	 * @throws FileNotFoundException if the resource cannot be resolved to a URL
+	 * @see #toURL(String)
 	 */
 	public static URL getURL(String resourceLocation) throws FileNotFoundException {
 		Assert.notNull(resourceLocation, "Resource location must not be null");
@@ -166,6 +168,7 @@ public abstract class ResourceUtils {
 	 * @return a corresponding File object
 	 * @throws FileNotFoundException if the resource cannot be resolved to
 	 * a file in the file system
+	 * @see #getFile(URL)
 	 */
 	public static File getFile(String resourceLocation) throws FileNotFoundException {
 		Assert.notNull(resourceLocation, "Resource location must not be null");
@@ -197,6 +200,7 @@ public abstract class ResourceUtils {
 	 * @return a corresponding File object
 	 * @throws FileNotFoundException if the URL cannot be resolved to
 	 * a file in the file system
+	 * @see #getFile(URL, String)
 	 */
 	public static File getFile(URL resourceUrl) throws FileNotFoundException {
 		return getFile(resourceUrl, "URL");
@@ -237,6 +241,7 @@ public abstract class ResourceUtils {
 	 * @throws FileNotFoundException if the URL cannot be resolved to
 	 * a file in the file system
 	 * @since 2.5
+	 * @see #getFile(URI, String)
 	 */
 	public static File getFile(URI resourceUri) throws FileNotFoundException {
 		return getFile(resourceUri, "URI");
@@ -268,6 +273,7 @@ public abstract class ResourceUtils {
 	 * i.e. has protocol "file", "vfsfile" or "vfs".
 	 * @param url the URL to check
 	 * @return whether the URL has been identified as a file system URL
+	 * @see #isJarURL(URL)
 	 */
 	public static boolean isFileURL(URL url) {
 		String protocol = url.getProtocol();
@@ -281,6 +287,7 @@ public abstract class ResourceUtils {
 	 * "vfszip", or "wsjar".
 	 * @param url the URL to check
 	 * @return whether the URL has been identified as a JAR URL
+	 * @see #isJarFileURL(URL)
 	 */
 	public static boolean isJarURL(URL url) {
 		String protocol = url.getProtocol();
@@ -295,6 +302,7 @@ public abstract class ResourceUtils {
 	 * @param url the URL to check
 	 * @return whether the URL has been identified as a JAR file URL
 	 * @since 4.1
+	 * @see #extractJarFileURL(URL)
 	 */
 	public static boolean isJarFileURL(URL url) {
 		return (URL_PROTOCOL_FILE.equals(url.getProtocol()) &&
@@ -307,6 +315,7 @@ public abstract class ResourceUtils {
 	 * @param jarUrl the original URL
 	 * @return the URL for the actual jar file
 	 * @throws MalformedURLException if no valid jar file URL could be extracted
+	 * @see #extractArchiveURL(URL)
 	 */
 	public static URL extractJarFileURL(URL jarUrl) throws MalformedURLException {
 		String urlFile = jarUrl.getFile();
@@ -368,6 +377,7 @@ public abstract class ResourceUtils {
 	 * @return the URI instance
 	 * @throws URISyntaxException if the URL wasn't a valid URI
 	 * @see java.net.URL#toURI()
+	 * @see #toURI(String)
 	 */
 	public static URI toURI(URL url) throws URISyntaxException {
 		return toURI(url.toString());
@@ -379,18 +389,21 @@ public abstract class ResourceUtils {
 	 * @param location the location String to convert into a URI instance
 	 * @return the URI instance
 	 * @throws URISyntaxException if the location wasn't a valid URI
+	 * @see #toURI(URL)
 	 */
 	public static URI toURI(String location) throws URISyntaxException {
 		return new URI(StringUtils.replace(location, " ", "%20"));
 	}
 
 	/**
-	 * Create a URL instance for the given location String,
+	 * Create a clean URL instance for the given location String,
 	 * going through URI construction and then URL conversion.
 	 * @param location the location String to convert into a URL instance
 	 * @return the URL instance
 	 * @throws MalformedURLException if the location wasn't a valid URL
 	 * @since 6.0
+	 * @see java.net.URI#toURL()
+	 * @see #toURI(String)
 	 */
 	@SuppressWarnings("deprecation")  // on JDK 20
 	public static URL toURL(String location) throws MalformedURLException {
@@ -406,13 +419,15 @@ public abstract class ResourceUtils {
 	}
 
 	/**
-	 * Create a URL instance for the given root URL and relative path,
+	 * Create a clean URL instance for the given root URL and relative path,
 	 * going through URI construction and then URL conversion.
 	 * @param root the root URL to start from
 	 * @param relativePath the relative path to apply
 	 * @return the relative URL instance
 	 * @throws MalformedURLException if the end result is not a valid URL
 	 * @since 6.0
+	 * @see #toURL(String)
+	 * @see StringUtils#applyRelativePath
 	 */
 	public static URL toRelativeURL(URL root, String relativePath) throws MalformedURLException {
 		// # can appear in filenames, java.net.URL should not treat it as a fragment
@@ -426,6 +441,7 @@ public abstract class ResourceUtils {
 	 * given connection, preferring {@code false} but leaving the flag at
 	 * its JVM default value for jar resources (typically {@code true}).
 	 * @param con the URLConnection to set the flag on
+	 * @see URLConnection#setUseCaches
 	 */
 	public static void useCachesIfNecessary(URLConnection con) {
 		if (!(con instanceof JarURLConnection)) {