Searching for Files by Name - Java File Path IO

Java examples for File Path IO:Directory Search

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Description

Searching for Files by Name

Demo Code

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitOption;
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.attribute.BasicFileAttributes;
import java.util.EnumSet;

public class Main {
  public static void main(String[] args) throws Exception {
    Path searchFile = Paths.get("test.jpg");
    Search walk = new Search(searchFile);
    EnumSet<FileVisitOption> opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);

    Iterable<Path> dirs = FileSystems.getDefault().getRootDirectories();
    for (Path root : dirs) {
      if (!walk.found) {
        Files.walkFileTree(root, opts, Integer.MAX_VALUE, walk);
      }/*from w w w. j  a  v  a  2 s. c  o  m*/
    }

    if (!walk.found) {
      System.out.println("The file " + searchFile + " was not found!");
    }

  }
}

class Search implements FileVisitor {

  private final Path searchedFile;
  public boolean found;

  public Search(Path searchedFile) {
    this.searchedFile = searchedFile;
    this.found = false;
  }

  void search(Path file) throws IOException {
    Path name = file.getFileName();
    if (name != null && name.equals(searchedFile)) {
      System.out.println("Searched file was found: " + searchedFile + " in "
          + file.toRealPath().toString());
      found = true;
    }
  }

  @Override
  public FileVisitResult postVisitDirectory(Object dir, IOException exc)
      throws IOException {
    System.out.println("Visited: " + (Path) dir);
    return FileVisitResult.CONTINUE;
  }

  @Override
  public FileVisitResult preVisitDirectory(Object dir, BasicFileAttributes attrs)
      throws IOException {
    return FileVisitResult.CONTINUE;
  }

  @Override
  public FileVisitResult visitFile(Object file, BasicFileAttributes attrs)
      throws IOException {
    search((Path) file);
    if (!found) {
      return FileVisitResult.CONTINUE;
    } else {
      return FileVisitResult.TERMINATE;
    }
  }

  @Override
  public FileVisitResult visitFileFailed(Object file, IOException exc)
      throws IOException {
    // report an error if necessary
    return FileVisitResult.CONTINUE;
  }
}

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