文件 AWS 開發套件範例 GitHub 儲存庫中有更多可用的 AWS SDK 範例
本文為英文版的機器翻譯版本,如內容有任何歧義或不一致之處,概以英文版為準。
HeadObject
搭配 AWS SDK 使用
下列程式碼範例示範如何使用 HeadObject
。
- SDK for Java 2.x
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注意
GitHub 上提供更多範例。尋找完整範例,並了解如何在 AWS 程式碼範例儲存庫
中設定和執行。 取得目錄儲存貯體中物件的中繼資料。
import org.slf4j.Logger; import org.slf4j.LoggerFactory; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.HeadObjectRequest; import software.amazon.awssdk.services.s3.model.HeadObjectResponse; import software.amazon.awssdk.services.s3.model.S3Exception; import java.nio.file.Path; import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucket; import static com.example.s3.util.S3DirectoryBucketUtils.createS3Client; import static com.example.s3.util.S3DirectoryBucketUtils.deleteAllObjectsInDirectoryBucket; import static com.example.s3.util.S3DirectoryBucketUtils.deleteDirectoryBucket; import static com.example.s3.util.S3DirectoryBucketUtils.getFilePath; import static com.example.s3.util.S3DirectoryBucketUtils.putDirectoryBucketObject; /** * Retrieves metadata for an object in the specified S3 directory bucket. * * @param s3Client The S3 client used to interact with S3 * @param bucketName The name of the directory bucket * @param objectKey The key (name) of the object to retrieve metadata for * @return True if the object exists, false otherwise */ public static boolean headDirectoryBucketObject(S3Client s3Client, String bucketName, String objectKey) { logger.info("Retrieving metadata for object: {} from bucket: {}", objectKey, bucketName); try { // Create a HeadObjectRequest HeadObjectRequest headObjectRequest = HeadObjectRequest.builder() .bucket(bucketName) .key(objectKey) .build(); // Retrieve the object metadata HeadObjectResponse response = s3Client.headObject(headObjectRequest); logger.info("Amazon S3 object: \"{}\" found in bucket: \"{}\" with ETag: \"{}\"", objectKey, bucketName, response.eTag()); logger.info("Content-Type: {}", response.contentType()); logger.info("Content-Length: {}", response.contentLength()); logger.info("Last Modified: {}", response.lastModified()); return true; } catch (S3Exception e) { logger.error("Failed to retrieve object metadata: {} - Error code: {}", e.awsErrorDetails().errorMessage(), e.awsErrorDetails().errorCode(), e); return false; } }
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如需 API 詳細資訊,請參閱《AWS SDK for Java 2.x API 參考》中的 HeadObject。
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