File类遍历目录

1,将遍历的目录保存至List并输出

View Code

 1 package com.study.FileDemo;
 2 
 3 import java.io.File;
 4 import java.io.FileNotFoundException;
 5 import java.io.FileOutputStream;
 6 import java.io.PrintStream;
 7 import java.util.ArrayList;
 8 import java.util.List;
 9 /**
10  * 
11  * 遍历目录输出至文件 
12  *
13 */
14 public class ListFileDemo01 {
15 
16     public static void main(String[] args) {
17         List<String> lst = ListFileTest(new File("d:" + File.separator));
18         PrintStream ps = null;
19         try {
20             ps = new PrintStream(new FileOutputStream(new File("e:"
21                     + File.separator + "fadfafa223.txt")));
22         } catch (FileNotFoundException e) {
23             e.printStackTrace();
24         }
25         for (String s : lst) {
26             ps.println(s);
27         }
28 
29     }
30 
31     public static List<String> ListFileTest(File file) {
32         File[] f = file.listFiles();
33         List<String> list = new ArrayList<String>();
34         if (f != null) {
35             for (int i = 0; i < f.length; i++) {
36                 if (f[i].isDirectory()) {
37                     list.addAll(ListFileTest(f[i]));//这句很关键
38                 } else {
39                     list.add(f[i].getPath());
40                 }
41             }
42         }
43         return list;
44 
45     }
46 }

2,将遍历的目录树状显示

import java.io.File;

public class ListTest03 {

    public static void main(String[] args) {
        listFile("d:\\DG343Std_x86", 1);

    }

    public static void listFile(String dir, int level) {
        File f = new File(dir);
        for (int i = 0; i <= level; i++) {
            System.out.print("| ");
        }
        System.out.println("|-" + f.getName());
        if (f.isDirectory()) {
            File fs[] = f.listFiles();
            for (File s : fs) {
                listFile(s.getPath(), level + 1);
            }
        }
    }

}