[ NIO 2.0 ]java.nio.file.AccessDeniedException: F:System Volume Information

java.nio.file.AccessDeniedException: F:System Volume Information

Java：前程似錦的 NIO 2.0

1. 處理目錄

Path dir = Paths.get("F:");

try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir, "*.txt")) {
	for (Path entry : stream) {
		System.out.println(entry.getFileName());
	}
} catch (IOException e) {
	e.printStackTrace();
}

2. 處理目錄樹

Path dir = Paths.get("F:");

try {
	Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
		@Override
		public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
			if (file.toString().endsWith(".pptx")) {
                System.out.println(file.toAbsolutePath());
                return FileVisitResult.CONTINUE;
            }
			//這做了過濾還報錯
            return FileVisitResult.SKIP_SUBTREE;
		}
	});
} catch (IOException e) {
	e.printStackTrace();
}

3. 處理目錄樹報錯以下：

java.nio.file.AccessDeniedException: F:System Volume Information
	at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:83)
	at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
	at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
	at sun.nio.fs.WindowsDirectoryStream.<init>(WindowsDirectoryStream.java:86)
	at sun.nio.fs.WindowsFileSystemProvider.newDirectoryStream(WindowsFileSystemProvider.java:518)
	at java.nio.file.Files.newDirectoryStream(Files.java:457)
	at java.nio.file.FileTreeWalker.visit(FileTreeWalker.java:300)
	at java.nio.file.FileTreeWalker.next(FileTreeWalker.java:372)
	at java.nio.file.Files.walkFileTree(Files.java:2706)
	at java.nio.file.Files.walkFileTree(Files.java:2742)
	at net.liuzd.java.demo.one.DirectoryStreamMain.main(DirectoryStreamMain.java:21)

4. 解決方案

Path dir = Paths.get("F:");
try {
            Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
                    if (file.toString().endsWith(".pptx")) {
                        System.out.println(file.toAbsolutePath());
                        return FileVisitResult.CONTINUE;
                    }
                    return FileVisitResult.SKIP_SUBTREE;
                }
                //增長失敗處理，直接過濾
                @Override
                public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
                    if (exc instanceof AccessDeniedException) {
                        return FileVisitResult.SKIP_SUBTREE;
                    }
                    return super.visitFileFailed(file, exc);
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }