使用java创建使用getSignedURLWithCustomPolicy而不是getSignedURLWithCannedPolicy的CloudFront签名url

import com.amazonaws.services.cloudfront.AmazonCloudFront;
import com.amazonaws.services.cloudfront.AmazonCloudFrontClientBuilder;
import com.amazonaws.services.cloudfront.util.SignerUtils.Protocol;

import java.net.URL;

public class CloudFrontSignedUrlGenerator {

    private static final String DISTRIBUTION_DOMAIN = "your-distribution-domain";
    private static final String KEY_PAIR_ID = "your-key-pair-id";
    private static final String PRIVATE_KEY_FILE = "/path/to/your/private-key-file.pem";

    public static void main(String[] args) throws Exception {
        AmazonCloudFront cloudFront = AmazonCloudFrontClientBuilder.defaultClient();
        
        URL signedUrl = cloudFront.getSignedURLWithCustomPolicy(getDistributionUrl(), getPrivateKey(), KEY_PAIR_ID, Protocol.HTTPS);
        System.out.println("Signed URL: " + signedUrl.toString());
    }

    private static URL getDistributionUrl() throws Exception {
        String url = "https://" + DISTRIBUTION_DOMAIN + "/path/to/resource";
        return new URL(url);
    }

    private static String getPrivateKey() throws Exception {
        // Load the private key from the file
        // You may need to handle the loading and conversion of the private key depending on your implementation
        return "your-private-key";
    }
}