CODEWITHSUNDEEP
javafiletreefilevisitorfile-traversal
Brandan B
Brandan B

Reputation: 474

Using Java's file tree system to get only files and folders not subdirectories

So I have to use the Java file tree system because .listfiles files is for some reason incredibly slow going through a remote network. However all the Java file tree system examples list all the files in the subdirectories, severely slowing down the program. How can I make it so that it will only search the directory and return the names of the folders and files only within that directory and not the subdirectories.

Sample Code:

package javaapplication6;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

/** Recursive listing with SimpleFileVisitor in JDK 7. */
public final class JavaApplication6 {

  public static void main(String... aArgs) throws IOException{
    String ROOT = "\\\\directory";
    FileVisitor<Path> fileProcessor = new ProcessFile();
    Files.walkFileTree(Paths.get(ROOT), fileProcessor);
  }

  private static final class ProcessFile extends SimpleFileVisitor<Path> {
    @Override public FileVisitResult visitFile(
      Path aFile, BasicFileAttributes aAttrs
    ) throws IOException {
      System.out.println("Processing file:" + aFile);
      return FileVisitResult.CONTINUE;
    }

    @Override  public FileVisitResult preVisitDirectory(
      Path aDir, BasicFileAttributes aAttrs
    ) throws IOException {
      System.out.println("Processing directory:" + aDir);
      return FileVisitResult.CONTINUE;
    }
  }
}

Any insight or help would be greatly appreciated, thanks.

Upvotes: 0

Views: 1981

Answers (2)

FinnTheHuman
FinnTheHuman

Reputation: 135

Use the longer version of the walkFileTree method that allows you to set maxDepth like so:

Files.walkFileTree(Paths.get(ROOT), EnumSet.noneOf(FileVisitOption.class),
   1, fileProcessor);

Note that unlike the simpler case sub-directories of ROOT will generate calls to visitFile. More generally sub-directories at the maxDepth level generate calls to visitFile but not calls to preVisitDirectory and postVisitDirectory.

Upvotes: 0

Brandan B
Brandan B

Reputation: 474

Using Directory stream seems to work more quickly and easily.

Upvotes: 0

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