디렉토리복사

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.util.stream.Stream;

Path source = Path.of("/user/com/dir1");
Path target = Path.of("/user/com/copy1");

try (Stream<Path> walk = Files.walk(source)) {
    walk.forEach(from -> {
        Path to = target.resolve(source.relativize(from));
        try {
            if (Files.isDirectory(from)) {
                Files.createDirectories(to);
            } else {
                Files.createDirectories(to.getParent());
                Files.copy(from, to, StandardCopyOption.REPLACE_EXISTING);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    });
}