import java.io.IOException;
import java.nio.file.FileVisitResult;
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;
class ListFiles extends SimpleFileVisitor<Path> {
private final int indentionAmount = 3;
private int indentionLevel;
public ListFiles() {
indentionLevel = 0;
}
private void indent() {
for (int i = 0; i < indentionLevel; i++) {
System.out.print(' ');
}
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) {
indent();
System.out.println("Visiting file:" + file.getFileName());
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path directory, IOException e)
throws IOException {
indentionLevel -= indentionAmount;
indent();
System.out.println("Finished with the directory: "
+ directory.getFileName());
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult preVisitDirectory(Path directory,
BasicFileAttributes attributes) throws IOException {
indent();
System.out.println("About to traverse the directory: "
+ directory.getFileName());
indentionLevel += indentionAmount;
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException exc)
throws IOException {
System.out.println("A file traversal error ocurred");
return super.visitFileFailed(file, exc);
}
}
public class Test {
public static void main(String[] args) {
try {
Path path = Paths.get("/home");
ListFiles listFiles = new ListFiles();
Files.walkFileTree(path, listFiles);
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
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