How to get classpath resources by extension?

Question

Suppose I've got a few resource files in my classpath:

/a/b/c/x1.txt
/a/b/d/x2.txt
/a/b/e/x3.txt

My code does not know the full paths of these resource files. It knows only their extension .txt.
How would you write a function to return the paths of the resources with extension .txt ?

Lungu Daniel · Accepted Answer · 2020-04-10T20:56:48.137

2

Try this:

Path path = Paths.get(YourClass.class.getResource("/resources").toURI());

List<String> result = Files.find(path, 100,
        (p, a) -> p.toString().toLowerCase().endsWith(".txt"))
        .map(Path::toString)
        .collect(Collectors.toList());

edited Apr 10 '20 at 20:56

answered Apr 10 '20 at 20:18

Lungu Daniel

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Would it work for _classpath resources_ but not just files in the file system ? The resource files might be stored in a jar added to the classpath. – Michael Apr 10 '20 at 20:21
No, I don't. Would prefer not to add dependencies. – Michael Apr 10 '20 at 20:39
Ok, there is a library which could help you with that. – Lungu Daniel Apr 10 '20 at 20:42
Do you mean Spring or another library ? – Michael Apr 10 '20 at 20:43
Spring has a class for this kind of task: PathMatchingResourcePatternResolver. See if this response could help you: https://stackoverflow.com/questions/3923129/get-a-list-of-resources-from-classpath-directory – Lungu Daniel Apr 10 '20 at 20:46
1

Great. Thanks a lot. I will definitely take a look. – Michael Apr 10 '20 at 20:47

How to get classpath resources by extension?

1 Answers1