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Add efficient existence check to ClassPathResource.isReadable()

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Includes reduced isReadable() check in PathResourceLookupFunction, aligned with PathResourceResolver.

Closes gh-27538
See gh-21372
This commit is contained in:
Juergen Hoeller
2021-10-12 16:18:09 +02:00
parent 6d4dfed772
commit 3a166ea742
4 changed files with 29 additions and 14 deletions
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12
spring-core/src/main/java/org/springframework/core/io/AbstractFileResolvingResource.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* Copyright 2002-2021 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.
@@ -88,7 +88,15 @@ public abstract class AbstractFileResolvingResource extends AbstractResource {
@Override
public boolean isReadable() {
try {
URL url = getURL();
return checkReadable(getURL());
}
catch (IOException ex) {
return false;
}
}
boolean checkReadable(URL url) {
try {
if (ResourceUtils.isFileURL(url)) {
// Proceed with file system resolution
File file = getFile();

12
spring-core/src/main/java/org/springframework/core/io/ClassPathResource.java
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@@ -142,6 +142,18 @@ public class ClassPathResource extends AbstractFileResolvingResource {
return (resolveURL() != null);
}
/**
* This implementation checks for the resolution of a resource URL upfront,
* then proceeding with {@link AbstractFileResolvingResource}'s length check.
* @see java.lang.ClassLoader#getResource(String)
* @see java.lang.Class#getResource(String)
*/
@Override
public boolean isReadable() {
URL url = resolveURL();
return (url != null && checkReadable(url));
}
/**
* Resolves a URL for the underlying class path resource.
* @return the resolved URL, or {@code null} if not resolvable