CODEWITHSUNDEEP
javafileutilsapache-commons-io
Mahipal Reddy
Mahipal Reddy

Reputation: 409

How to get list of files with specified extensions and excluding few directories?

I need to list files(specified extensions) from a directory excluding a few subdirectories.

I'm able to filter with extensions but not with two conditions 1) Files should be filtered by extension 2) Should exclude few subdirectories

    File dir = new File("D:\\SomeDir");
    String[] extensions = new String[] { "txt", "java" };
    List<File> files = (List<File>) FileUtils.listFiles(dir, extensions, true);
    for (File file : files) {
        System.out.println("file: " + file.getCanonicalPath());
    }

How to exclude selected subdirectories?

Upvotes: 0

Views: 3527

Answers (3)

Paul Cosma
Paul Cosma

Reputation: 313

Here you go

public static void main(String[] args) throws IOException {
    File dir = new File("C:\\Users\\cosmap\\Documents\\travel-expenses");
    List<String> excludedDirs = Arrays.asList("src", ".git");
    List<String> extensions = Arrays.asList("xml", "yml");

    listFiles(dir, excludedDirs, extensions).forEach(System.out::println);
}

public static List<File> listFiles(File currentFile, List<String> excludedDirs, List<String> extensions) {
    List<File> out = new ArrayList<>();
    File[] files = currentFile.listFiles();

    // might be null
    if(files == null) {
        return out;
    }

    for (File file : files) {
        // add recursively only if is directory and not in the excluded list
        if(file.isDirectory() && !excludedDirs.contains(file.getName())) {
            out.addAll(listFiles(file, excludedDirs, extensions));
        // add if is file and in the allowed extensions list
        } else if (file.isFile() && extensions.contains(file.getName().substring(file.getName().lastIndexOf('.') + 1))) {
            out.add(file);
        }
    }

    return out;
}

Upvotes: 1

Ashok Kumar N
Ashok Kumar N

Reputation: 573

try this code:

// for exlude file extension  
NotFileFilter suffixFileFilterFileFilter=new NotFileFilter(new 
SuffixFileFilter(new String[] { "txt", "java" }));  

//to include only selected extension use below one
//IOFileFilter suffixFileFilterFileFilter= new SuffixFileFilter(new String[] { "java", "txt" });

NotFileFilter directoryFileFilterFileFilter=new NotFileFilter(new 
PrefixFileFilter(new String[] { "tolearn", "dir2" }));   // for directory
File dir = new File("D:\\SomeDir");
List<File> fileList  = (List<File>)  FileUtils.listFiles(dir,suffixFileFilterFileFilter,directoryFileFilterFileFilter);
    for (File file : fileList) {
        System.out.println("file: " + file.getCanonicalPath());
    }

Upvotes: 1

Andree Kr&#246;ger
Andree Kr&#246;ger

Reputation: 104

You can use FileUtils.listFilesAndDirs or, another solution: instead of list all dirs and exclude a few directories you can exclude subdirectories in line 3 List<File> files = (List<File>) FileUtils.listFiles(dir, extensions, *false*); and include in a second loop your subdirecories you want to list the files.

Upvotes: 0

Related Questions