本文實例講述了java實現遞歸文件列表的方法。分享給大家供大家參考。具體如下：
FileListing.java如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
import java.util.*;import java.io.*;/*** Recursive file listing under a specified directory.* * @author javapractices.com* @author Alex Wong* @author anonymous user*/public final class FileListing { /** * Demonstrate use. * * @param aArgs - <tt>aArgs[0]</tt> is the full name of an existing * directory that can be read. */ public static void main(String... aArgs) throws FileNotFoundException { File startingDirectory= new File(aArgs[0]); List<File> files = FileListing.getFileListing(startingDirectory); //print out all file names, in the the order of File.compareTo() for(File file : files ){ System.out.println(file); } } /** * Recursively walk a directory tree and return a List of all * Files found; the List is sorted using File.compareTo(). * * @param aStartingDir is a valid directory, which can be read. */ static public List<File> getFileListing( File aStartingDir ) throws FileNotFoundException { validateDirectory(aStartingDir); List<File> result = getFileListingNoSort(aStartingDir); Collections.sort(result); return result; } // PRIVATE // static private List<File> getFileListingNoSort( File aStartingDir ) throws FileNotFoundException { List<File> result = new ArrayList<File>(); File[] filesAndDirs = aStartingDir.listFiles(); List<File> filesDirs = Arrays.asList(filesAndDirs); for(File file : filesDirs) { result.add(file); //always add, even if directory if ( ! file.isFile() ) { //must be a directory //recursive call! List<File> deeperList = getFileListingNoSort(file); result.addAll(deeperList); } } return result; } /** * Directory is valid if it exists, does not represent a file, and can be read. */ static private void validateDirectory ( File aDirectory ) throws FileNotFoundException { if (aDirectory == null) { throw new IllegalArgumentException("Directory should not be null."); } if (!aDirectory.exists()) { throw new FileNotFoundException("Directory does not exist: " + aDirectory); } if (!aDirectory.isDirectory()) { throw new IllegalArgumentException("Is not a directory: " + aDirectory); } if (!aDirectory.canRead()) { throw new IllegalArgumentException("Directory cannot be read: " + aDirectory); } }} |
希望本文所述對大家的java程序設計有所幫助。
