用java中的密钥计算HMAC-SHA512

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

public class HmacSHA512Example {
    public static void main(String[] args) {
        String secretKey = "mySecretKey";
        String message = "Hello, World!";

        try {
            String hmacSHA512 = calculateHmacSHA512(secretKey, message);
            System.out.println("HMAC-SHA512: " + hmacSHA512);
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            e.printStackTrace();
        }
    }

    public static String calculateHmacSHA512(String secretKey, String message) throws NoSuchAlgorithmException, InvalidKeyException {
        Mac sha512_HMAC = Mac.getInstance("HmacSHA512");
        SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), "HmacSHA512");
        sha512_HMAC.init(secretKeySpec);
        byte[] hmacBytes = sha512_HMAC.doFinal(message.getBytes(StandardCharsets.UTF_8));
        StringBuilder sb = new StringBuilder();
        for (byte b : hmacBytes) {
            sb.append(String.format("%02x", b));
        }
        return sb.toString();
    }
}