java中的HMAC签名

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

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

        try {
            Mac mac = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
            mac.init(secretKeySpec);
            byte[] hmacBytes = mac.doFinal(message.getBytes(StandardCharsets.UTF_8));
            String hmac = Base64.getEncoder().encodeToString(hmacBytes);
            System.out.println("HMAC: " + hmac);
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            e.printStackTrace();
        }
    }
}