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我的任务是在命令行中插入目录路径，并将 Files.walkFileTree() 操作的结果以“Tree”格式写入文件。我有以下代码：

public class IOTask {
public static void main(String[] args) {
        File file = new File(args[0]);
        if (file.exists() && file.isDirectory()) {
            Path files = Paths.get(args[0]);
            PrintFiles pf = new PrintFiles();
            try {
                Files.walkFileTree(files, pf);
            } catch (IOException e) {
                e.printStackTrace();
            }

Args [0]是路径“e://Music//Accept//”。要将结果写入我使用的文件中FileVisitor。

public class PrintFiles extends SimpleFileVisitor<Path> {
private FileOutputStream outputStream;
private final Path baseFolder = Paths.get("e://Music//Accept//");

public PrintFiles() {
    try {
        this.outputStream = new FileOutputStream("data/File.txt");
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
}

@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
    Path relative = baseFolder.relativize(dir);
    int count = relative.getNameCount();
    try {
        this.outputStream.write("|-----\t".repeat(count) + dir.getFileName() + System.getProperty("line.separator"));
    } catch (IOException | NumberFormatException e) {
        e.printStackTrace();
    }
    return FileVisitResult.CONTINUE;
}

@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attr) {
    Path relative = baseFolder.relativize(file);
    int count = relative.getNameCount();
    if  (attr.isRegularFile()) {
        try {
            this.outputStream.write("|\t".repeat(count) + file.getFileName() + System.getProperty("line.separator"));
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
        }
    }
    return FileVisitResult.CONTINUE;
}

}

计算文件夹，.relativize(dir)我希望在文件中获得以下“树”结果：

|----接受

 |----First album

      |file...
      |file...

 |----Second album

      |file...

等等...但是出了点问题...我需要帮助。先感谢您！

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