设置要访问的目录级别的最大数量，以确保遍历所有级别

// 来 自 n o w  j a v a  . c o m

import java.io.IOException;

import java.nio.file.FileVisitOption;

import java.nio.file.FileVisitResult;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.file.SimpleFileVisitor;

import java.util.EnumSet;


public class Main {

  public static void main(String[] args) throws Exception {

    Path listDir = Paths.get("C:/folder1"); // define the starting file

    ListTree walk = new ListTree(); // instantiate the walk

    EnumSet<FileVisitOption> opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS); // follow links


    try {/** 时   代     Java  公  众  号 - nowjava.com 提供 **/

      Files.walkFileTree(listDir, opts, Integer.MAX_VALUE, walk); // start the

                                                                  // walk

    } catch (IOException e) {

      System.err.println(e);

    }


  }

}


class ListTree extends SimpleFileVisitor<Path> {


  @Override

  public FileVisitResult postVisitDirectory(Path dir, IOException exc) {


    System.out.println(