Obtaining a DIS Notification Policy (SDK for Java)

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.dis.DisPolicyRule;
import com.obs.services.model.dis.GetBucketDisPolicyRequest;
import com.obs.services.model.dis.GetBucketDisPolicyResult;
public class GetBucketDisPolicy {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are not advised to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN North-Beijing4 is used here as an example. Replace it with the one currently in use.
        // Obtain an endpoint using environment variables or import it in other ways.
        String endPoint = System.getenv("ENDPOINT");
        ObsConfiguration obsConfiguration = new ObsConfiguration();
        obsConfiguration.setEndPoint(endPoint);
        ObsClient obsClient = new ObsClient(ak, sk, securityToken, obsConfiguration);
        try {
            String exampleBucket = "exampleBucket";
            GetBucketDisPolicyResult result =
                obsClient.getBucketDisPolicy(new GetBucketDisPolicyRequest(exampleBucket));
            System.out.println("GetBucketDisPolicy successfully");
            for (DisPolicyRule rule : result.getDisPolicyConfiguration().getRules()) {
                System.out.println("Rule Id:"+ rule.getId());
                System.out.println("Project Id:"+ rule.getProject());
                System.out.println("Agency:"+ rule.getAgency());
                System.out.println("Events:"+ rule.getEvents());
                System.out.println("Prefix:"+ rule.getPrefix());
                System.out.println("Suffix:"+ rule.getSuffix());
            }
        } catch (ObsException e) {
            System.out.println("GetBucketDisPolicy failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("GetBucketDisPolicy failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}