如何在java中对mpesa passcode进行散列和编码

import java.security.MessageDigest;
import java.util.Base64;

public static String hashPasscode(String passcode) throws Exception {
    MessageDigest digest = MessageDigest.getInstance("SHA-256");
    byte[] hash = digest.digest(passcode.getBytes("UTF-8"));
    return Base64.getEncoder().encodeToString(hash);
}

String passcode = "your_passcode";
String hashedPasscode = hashPasscode(passcode);
System.out.println("Hashed Passcode: " + hashedPasscode);