CODEWITHSUNDEEP
javafilecompiler-construction
newSpringer
newSpringer

Reputation: 1028

How to get a list of files from within a folder structure

im creating a program that will compile java files, at the moment i have the program compiling numerous files at a time in one particular folder. but what i want it to do is to compile all the files in a folder structure given a folder to start (eg. if given the following address C:/files_to_be_compiled, can you search all the folders within this folder to get a list of all the .class files). I have this code that is getting all the .class files from a single folder but i need to expand this to get all the .class files from all the rest of the folders in that folder given

 String files;
        File folder = new File("C:/files_to_compile");
        File[] listOfFiles = folder.listFiles();
        {

            for (int i = 0; i < listOfFiles.length; i++) {

                if (listOfFiles[i].isFile()) {
                    files = listOfFiles[i].getName();
                    if (files.endsWith(".class") || files.endsWith(".CLASS")) {
                        System.out.println(files);
                    }
                }
            }
        }

how would i extend the code above get all the .class files from within all the folders in a given folder?

Upvotes: 0

Views: 2427

Answers (4)

tenorsax
tenorsax

Reputation: 21243

You can use DirectoryWalker from Apache Commons to walk through a directory hierarchy and apply a filter - FileFilterUtils.suffixFileFilter(".class"). For example: 

public class ClassFileWalker extends DirectoryWalker {
    public ClassFileWalker() {
        super(FileFilterUtils.directoryFileFilter(), 
                FileFilterUtils.suffixFileFilter(".class"), -1);
    }

    protected void handleFile(File file, int depth, Collection results) {
        if(file.isFile())
            results.add(file);
    }

    public List<File> getFiles(String location) {
        List<File> files = Lists.newArrayList();
        try {
            walk(new File(location), files);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return files;
    }
}

Then use it like this: 

ClassFileWalker walker = new ClassFileWalker();
List<File> files = walker.getFiles("C:/files_to_be_compiled");

Upvotes: 0

Mustafa
Mustafa

Reputation: 407

public static void listFilesForFolder(String path)
{
    File folder = new File(path);
    File[] files = folder.listFiles();
    for(File file : files)
    {
        if (file.isDirectory()){
            listFilesForFolder(file.getAbsolutePath());
        }
        else if (file.isFile())
        {
            // your code goes here
        }
    }
}

// run
listFilesForFolder("C:/files_to_compile");

Upvotes: 1

StepTNT
StepTNT

Reputation: 3967

Maybe somwthing like 

void analyze(File folder){
    String files;        
    File[] listOfFiles = folder.listFiles();
    {

        for (int i = 0; i < listOfFiles.length; i++) {

            if (listOfFiles[i].isFile()) {
                files = listOfFiles[i].getName();
                if (files.endsWith(".class") || files.endsWith(".CLASS")) {
                    System.out.println(files);
                }
            } else if (listOfFiles[i].isDirectory()){
                analyze(listOfFiles[i]);
        }
    }
 }

void start(){
    File folder = new File("C:/files_to_compile");
    analyze(folder);
}

This way, you're analyzing your structure recursively (Depth-first search).

Upvotes: 2

Elliot Bonneville
Elliot Bonneville

Reputation: 53371

This answer may be of use to you.

Example code borrowed from linked answer:

public void listFilesForFolder(final File folder) {
    for (final File fileEntry : folder.listFiles()) {
        if (fileEntry.isDirectory()) {
            listFilesForFolder(fileEntry);
        } else {
            System.out.println(fileEntry.getName());
        }
    }
}

final File folder = new File("/home/you/Desktop");
listFilesForFolder(folder);

Upvotes: 0

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