删除看起来不为空的文件夹

Question

我尝试使用 Java 删除 NAS 上的文件和文件夹。一切正常，除非用户在我想要删除的文件夹中打开了 Windows 资源管理器。

例如，我有一个文件夹A，其中包含一个文件夹B。我想删除文件夹B，然后删除文件夹A。文件夹B将被删除，但文件夹A不会被删除。只有当有人在文件夹B中使用Windows资源管理器时才会发生这种情况。我的代码说文件夹A不为空，它仍然包含文件夹B。但这怎么可能，因为文件夹B刚刚被删除，并且在Windows资源管理器中我看不到文件夹B（即使检查了隐藏文件）。

我尝试在本地运行此代码，即使我在文件夹 B 中打开 Windows 资源管理器，它也能正常工作。这只发生在 NAS 上。你有什么想法吗？

boolean isSuccessfullyRemoved 
void test(){
    isSuccessfullyRemoved = true
    Path p = Paths.get('FOLDER B')
    try (def ds = Files.newDirectoryStream(p)) {
        ds.each { subPath ->
            // Delete every files in the folder B
            if (subPath.toFile().isFile()) {
                deleteFileorFolder(subPath)
            }
        }
    }

    // The folder B should be empty if the deletion of the files was successful and does not contains a folder
    if (isSuccessfullyRemoved && isDirEmpty(p)) {
        // Delete Folder B
        deleteFileorFolder(p)

        // Folder B has been deleted, isSuccessfullyRemoved is TRUE but isDirEmpty is FALSE, why?
        if (isSuccessfullyRemoved && isDirEmpty(p.parent)) {
            deleteFileorFolder(p.parent)
        }
    }
}

boolean isDirEmpty(Path directory) {
    try (def ds = Files.newDirectoryStream(directory)) {
        return !ds.iterator().hasNext()
    }
}

void deleteFileorFolder(Path p) {
    try {
        Files.delete(p)
    } catch (ignored) {
        isSuccessfullyRemoved = false
    }
}

Answer 1

不是答案，只是对重现此问题的更简单方法的观察：

// Setup a path to temp directory on NAS:
Path sub = Path.of("F:/Temp/Parent/Child/Sub");
Files.createDirectories(sub);

// Open explorer to Child
Desktop.getDesktop().open(sub.getParent().toFile());
Thread.sleep(10000L);

// Now try to delete
Files.delete(sub);
Files.delete(sub.getParent());
Files.delete(sub.getParent().getParent());

// If the explorer is open then the last delete fails with:
// => Exception java.nio.file.DirectoryNotEmptyException: F:\Temp\Parent
//       at WindowsFileSystemProvider.implDelete (WindowsFileSystemProvider.java:270)
//       at AbstractFileSystemProvider.delete (AbstractFileSystemProvider.java:104)
//        at Files.delete (Files.java:1152)

如果不忽略异常，问题更容易发现：

static void deleteFileorFolder(Path p) {
    System.out.println("deleteFileorFolder "+p);
    Files.delete(p);
}