如何让Android Java HMAC像PHP一样成为SHA256？

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class HmacUtils {
    public static String generateHmacSha256(String message, String secretKey) {
        try {
            Mac sha256Hmac = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(), "HmacSHA256");
            sha256Hmac.init(secretKeySpec);
            byte[] hmacBytes = sha256Hmac.doFinal(message.getBytes());
            return Base64.getEncoder().encodeToString(hmacBytes);
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            e.printStackTrace();
        }
        return null;
    }
}

String message = "Hello World";
String secretKey = "YourSecretKey";
String hmacSha256 = HmacUtils.generateHmacSha256(message, secretKey);
System.out.println("SHA256 HMAC: " + hmacSha256);