list all files in the folder and also sub folders

Question

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List all files from a directory recursively with Java

How can i return a file array that include all files on the folder and also sub folders my method just work for folder and it doesn't include sub folders .

public File[] listf(String directoryName) {

    // .............list file
    File directory = new File(directoryName);

    // get all the files from a directory
    File[] fList = directory.listFiles();

    for (File file : fList) {
        if (file.isFile()) {
            System.out.println(file.getAbsolutePath());
        } else if (file.isDirectory()) {
            listf(file.getAbsolutePath());
        }
    }
    System.out.println(fList);
    return fList;
}

FileUtils.listFiles(dir, new String[]{".xml"}, true)... in apache-commons — user2069723, Jan 14 '16 at 15:06

score 103 · Accepted Answer · edited Jul 24 '21 at 06:09

103

Using you current code, make this tweak:

public void listf(String directoryName, List<File> files) {
    File directory = new File(directoryName);

    // Get all files from a directory.
    File[] fList = directory.listFiles();
    if(fList != null)
        for (File file : fList) {      
            if (file.isFile()) {
                files.add(file);
            } else if (file.isDirectory()) {
                listf(file.getAbsolutePath(), files);
            }
        }
}

edited Jul 24 '21 at 06:09

Hasen

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answered Feb 03 '13 at 19:41

Nathan

1,747
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1

fyi if you want the current folder you can use `new File(".");' – SüniÚr Oct 28 '14 at 08:26
5

Maybe public void listf(String directoryName, List files) { is better – Stimpson Cat Mar 31 '15 at 09:15
There should be null check for `fList` array before Iterating. – binit92 Aug 08 '18 at 13:16
1

`if(fList != null{` is missing a `)`, just fix to `if(fList != null) {` – André Vinícius Sep 06 '18 at 11:01

score 38 · Answer 2 · edited Jul 06 '15 at 23:08

Use FileUtils from Apache commons.

listFiles

public static Collection<File> listFiles(File directory,
                                         String[] extensions,
                                         boolean recursive)
Finds files within a given directory (and optionally its subdirectories) which match an array of extensions.
Parameters:
directory - the directory to search in
extensions - an array of extensions, ex. {"java","xml"}. If this parameter is null, all files are returned.
recursive - if true all subdirectories are searched as well
Returns:
an collection of java.io.File with the matching files

Cyrille Ka · Answer 3 · 2013-02-03T19:53:01.710

22

You can return a List instead of an array and things gets much simpler.

    public static List<File> listf(String directoryName) {
        File directory = new File(directoryName);

        List<File> resultList = new ArrayList<File>();

        // get all the files from a directory
        File[] fList = directory.listFiles();
        resultList.addAll(Arrays.asList(fList));
        for (File file : fList) {
            if (file.isFile()) {
                System.out.println(file.getAbsolutePath());
            } else if (file.isDirectory()) {
                resultList.addAll(listf(file.getAbsolutePath()));
            }
        }
        //System.out.println(fList);
        return resultList;
    }

edited Feb 03 '13 at 19:53

answered Feb 03 '13 at 19:45

Cyrille Ka

15,328
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but i want to merge the array – Mostafa Jamareh Feb 03 '13 at 19:52
Why? I mean: what is your problem and why would you want to avoid using lists which are doing all the merging for you? – Cyrille Ka Feb 03 '13 at 19:55
yes excuse me i sleepy(sleeplessness) at the moment – Mostafa Jamareh Feb 03 '13 at 20:04
this works , i have used it in my app – kinsley kajiva Jul 16 '17 at 18:55
This is okay to recursively return files and directories within that specified directory. And as the question (even though its a duplicate) is asking how to return (only) files from the provided directory and files within all sub-directories you may have to change the codes a little bit: //resultList.addAll(Arrays.asList(fList)); for (File file : fList) { if (file.isFile()) { resultList.add(file); } else if (file.isDirectory()) { resultList.addAll(listf(file.getAbsolutePath())); } } – Ishimwe Aubain Consolateur Feb 12 '19 at 09:58

list all files in the folder and also sub folders

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