java-递归地获取带有文件的directorys的路径

Question

|   |-->Foo2 --> lore.java
|Foo|
|   |-->Foo3 --> Foo4 --> ipsum.java

|
|   |--> Foo2 --> lore.java
|   |
|Foo|         | --> ipsum.java
|   |--> Foo3 |
|   |         | --> Foo4 --> rosae.java

在本例中，我希望保存foo/foo2、foo/foo3和foo/foo3/foo4。有什么想法吗？谢了！

Answer 1

公共类ListAllFIlesClassic{

public static void main(String[] args) {

    File folder = new File(
            "java\\com\\javaprogramto\\w3schools\\programs");

    List<String> fileNamesList = new ArrayList<>();

    traverseDirectory(".*\\.java", folder, fileNamesList);

    for (String fileName : fileNamesList) {
        System.out.println(fileName);
    }
}

public static void traverseDirectory(final String pattern, final File folder, List<String> fileNamesList) {
    for (final File f : folder.listFiles()) {

        if (f.isDirectory()) {
            traverseDirectory(pattern, f, fileNamesList);
        }

        if (f.isFile()) {
            if (f.getName().matches(pattern)) {
                fileNamesList.add(f.getAbsolutePath());
            }
        }

    }
}

}

---使用Java 8 walk（）

public static void main(String[] args) {
    String directory = "java\\com\\javaprogramto\\w3schools\\programs";

    // Finding only files.
    System.out.println("File Names : ");
    printFileNames(directory);

    // Finding only directories
    System.out.println("Folder Names : ");
    printFolderNames(directory);

    // Filtering file names by a pattern.
    System.out.println("Filtering name by a pattern \"Line\": ");
    filterByPattern(directory);

}

private static void printFileNames(String directory) {

    // Reading the folder and getting Stream.
    try (Stream<Path> walk = Files.walk(Paths.get(directory))) {

        // Filtering the paths by a regualr file and adding into a list.
        List<String> fileNamesList = walk.filter(Files::isRegularFile).map(x -> x.toString())
                .collect(Collectors.toList());

        // printing the file nams
        fileNamesList.forEach(System.out::println);

    } catch (IOException e) {
        e.printStackTrace();
    }
}

private static void printFolderNames(String directory) {

    // Reading the folder and getting Stream.
    try (Stream<Path> walk = Files.walk(Paths.get(directory))) {

        // Filtering the paths by a folder and adding into a list.
        List<String> folderNamesList = walk.filter(Files::isDirectory).map(x -> x.toString())
                .collect(Collectors.toList());

        // printing the folder names
        folderNamesList.forEach(System.out::println);

    } catch (IOException e) {
        e.printStackTrace();
    }
}

private static void filterByPattern(String directory) {

    // Reading the folder and getting Stream.
    try (Stream<Path> walk = Files.walk(Paths.get(directory))) {

        // Filtering the paths by a folder and adding into a list.

        List<String> fileNamesList = walk.map(x -> x.toString()).filter(f -> f.contains("Line"))
                .collect(Collectors.toList());

        // printing the folder names
        fileNamesList.forEach(System.out::println);

    } catch (IOException e) {
        e.printStackTrace();
    }
}