授权头格式错误，也不确定如何向头部添加签名

在HTTP请求头中添加授权头，并将签名添加到授权头中。下面是Java代码示例：

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.math.BigInteger;
import java.security.MessageDigest;

public class AuthorizationHeader {
    public static void main(String[] args) throws Exception {

        // Step 1: Prepare your API key and secret key
        String apiKey = "YOUR_API_KEY";
        String secretKey = "YOUR_SECRET_KEY";

        // Step 2: Prepare the request data
        String method = "GET";
        String url = "https://example.com/api/v1/some-endpoint";
        String timestamp = Long.toString(System.currentTimeMillis());

        // Step 3: Construct the string to sign
        String unsignedString = method + url + timestamp;

        // Step 4: Sign the string
        String signature = hmacSha512(secretKey, unsignedString);

        // Step 5: Add the Authorization header to the request
        String authorizationHeader = "Bearer " + apiKey + ":" + timestamp + ":" + signature;

        // Add the authorization header to the request
        // ...

    }

    // Helper function to compute the HMAC-SHA512 signature
    private static String hmacSha512(String secret, String data) throws Exception {
        Mac mac = Mac.getInstance("HmacSHA512");
        SecretKeySpec secretKeySpec = new SecretKeySpec(secret.getBytes(), "HmacSHA512");
        mac.init(secretKeySpec);
        byte[] hmacBytes = mac.doFinal(data.getBytes());
        return String.format("%0128x", new BigInteger(1, hmacBytes));
    }
}