Java 8 : Get files from folder / subfolder

Question

I have this folders inside the resources folder of a SpringBoot app.

resources/files/a.txt
resources/files/b/b1.txt
resources/files/b/b2.txt
resources/files/c/c1.txt
resources/files/c/c2.txt

I want to get all the txt file, so this is my code:

   ClassLoader classLoader = this.getClass().getClassLoader();
   Path configFilePath = Paths.get(classLoader.getResource("files").toURI());   

   List<Path> atrackFileNames = Files.list(configFilePath)
                .filter(s -> s.toString().endsWith(".txt"))
                .map(Path::getFileName)
                .sorted()
                .collect(toList());

But I only get the file a.txt

score 26 · Accepted Answer · edited Nov 27 '19 at 14:29

    Path configFilePath = FileSystems.getDefault()
            .getPath("C:\\Users\\sharmaat\\Desktop\\issue\\stores");

    List<Path> fileWithName = Files.walk(configFilePath)
            .filter(s -> s.toString().endsWith(".java"))
            .map(Path::getFileName).sorted().collect(Collectors.toList());

    for (Path name : fileWithName) {
        // printing the name of file in every sub folder
        System.out.println(name);
    }

score 5 · Answer 2 · answered Feb 01 '18 at 13:26

Files.list(path) method returns only stream of files in directory. And the method listing is not recursive.
Instead of that you should use Files.walk(path). This method walks through all file tree rooted at a given starting directory.
More about it:
https://docs.oracle.com/javase/8/docs/api/java/nio/file/Files.html#walk-java.nio.file.Path-java.nio.file.FileVisitOption...-

Java 8 : Get files from folder / subfolder

2 Answers2