Trying out Java 7 NIO2's FileVisitor, along with half of Guava to attempt a slightly functional style. This is still pretty verbose in Java.

gistfile1.java

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;

import org.apache.commons.lang3.StringUtils;

import com.google.common.base.Function;
import com.google.common.collect.ContiguousSet;
import com.google.common.collect.DiscreteDomains;
import com.google.common.collect.Iterables;
import com.google.common.collect.Ranges;

public class TryingOutNIO2 {

    public void someFunction() {
        Path path = Paths.get("/tmp");
        SimpleFileVisitor<Path> simpleFileVisitor = new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult visitFile(final Path path, BasicFileAttributes attributes) throws IOException {
                ContiguousSet<Integer> range = Ranges.closedOpen(0, path.getNameCount()).asSet(DiscreteDomains.integers());
                String completePathAndFilename = StringUtils.join(
                        Iterables.transform(range, new Function<Integer, String>() {
                            @Override
                            public String apply(Integer x) {
                                return path.getName(x).toString();
                            }
                        }), "/");
                System.out.println(completePathAndFilename);
                return FileVisitResult.CONTINUE;
            }
        };
        try {
            Files.walkFileTree(path, simpleFileVisitor);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Just experimenting whilst reading Evans and Verburg's "The Well-Grounded Java Developer" (http://www.manning.com/evans/)