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Critical Ghost
Asked: 2020-03-29 05:44:04 +0800 CST 2020-03-29 05:44:04 +0800 CST

How to search for a file within multiple folders?

  • 772

Good morning,

The problem I have is that I need to search for one or more files within one or more folders.

Code1 :

 String path = "C:\\Users\\ProKode\\Desktop\\PruebaBuscar";

    String files;
    File folder = new File(path);
    File[] listOfFiles = folder.listFiles();

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

        if (listOfFiles[i].isFile())             {
            files = listOfFiles[i].getName();
            System.out.println(files);
        }
    }

Output Code1:

run: Hello.txt BUILD SUCCESSFUL (total time: 0 seconds)

_

Folder Image:

enter image description here

Which contains the following:

Inside the folder there are subfolders and inside them there are files

Folder content: enter image description here

That is to say that it is not looking for the files that are inside the other folders.

What I need is for me to find everything that is inside the folder

End Output:

The file Hello.txt was found inside the TestSearch folder.

The file Text1.1.txt was found inside the folder Capeta1.

The file Text1.2.txt was found inside the folder Folder1.

The file Text1.3.txt was found inside the folder Folder1.

The file Text2.1.txt was found inside the Folder2 folder.

The file Text2.2.txt was found inside the folder Folder2.

The file Text2.3.txt was found inside the folder Folder2.

The file Text3.1.txt was found inside the folder Folder3.

The file Text3.2.txt was found inside the folder Folder3.

The file Text3.3.txt was found inside the folder Folder3.

Thank you so much.

java

2 Answers

  1. Try this one, called recursive form:

    import java.io.File;
import java.io.IOException;

public class ListarArchivos {

    public static void main(String[] args) {
        File miDir = new File("."); // directorio actual, cambiarlo si se quiere
        verContenidoFolder(miDir);
    }

    public static void verContenidoFolder(File dir) {
        try {
            File[] files = dir.listFiles();
            for (File file : files) {
                if (file.isDirectory()) {
                    System.out.println("directorio:" + file.getCanonicalPath());
                    verContenidoFolder(file);
                } else {
                    System.out.println("     archivo:" + file.getCanonicalPath());
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
    • 4
  2. Best Answer

    If you are using Java 7, you can use Java File IO (NIO.2). Namely:

    public static void main(String[] args) {

    String dir = "C:\\Users\\ProKode\\Desktop\\PruebaBuscar";
    String txt = "moises;diego;usuario";

    try {

        final Pattern pattern = Pattern.compile(
                "\\A(?=.*" +  txt.replace(";", ")(?=.*") + ").*\\z", 
                Pattern.CASE_INSENSITIVE | Pattern.DOTALL);

        Files.walkFileTree(Paths.get(dir), new SimpleFileVisitor<Path>() {

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
                    throws IOException {
                String str = new String(Files.readAllBytes(file), StandardCharsets.UTF_8);
                if (pattern.matcher(str).matches()) {
                    System.out.println(file);
                }
                return FileVisitResult.CONTINUE;
            }

        });

    } catch (IOException e) {
        LOG.log(Level.SEVERE, "IO Error", e);
    }

}
    • 3