Java -如何检查存储桶中是否存在GCS存储对象？

import com.google.cloud.storage.Blob;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;

public class GCSExample {
    public static void main(String[] args) {
        // 设置Google Cloud项目ID
        String projectId = "your-project-id";
        // 设置存储桶名称
        String bucketName = "your-bucket-name";
        // 设置存储对象名称
        String objectName = "your-object-name";

        // 创建Storage实例
        Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();

        // 构建BlobId对象
        BlobId blobId = BlobId.of(bucketName, objectName);

        // 检查存储对象是否存在
        Blob blob = storage.get(blobId);
        if (blob != null) {
            System.out.println("存储对象存在");
        } else {
            System.out.println("存储对象不存在");
        }
    }
}