文件 AWS 開發套件範例 GitHub 儲存庫中有更多可用的 [AWS SDK 範例](https://github.com/awsdocs/aws-doc-sdk-examples)。

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。

# `HeadBucket` 搭配 AWS SDK 使用
<a name="s3-directory-buckets_example_s3-directory-buckets_HeadBucket_section"></a>

以下程式碼範例顯示如何使用 `HeadBucket`。

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#### [ Java ]

**SDK for Java 2.x**  
 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](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/s3/src/main/java/com/example/s3/directorybucket#code-examples)中設定和執行。
檢查指定的 S3 目錄儲存貯體是否存在且可存取。  

```
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.HeadBucketRequest;
import software.amazon.awssdk.services.s3.model.S3Exception;

import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.createS3Client;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteDirectoryBucket;

    /**
     * Checks if the specified S3 directory bucket exists and is accessible.
     *
     * @param s3Client   The S3 client used to interact with S3
     * @param bucketName The name of the directory bucket to check
     * @return True if the bucket exists and is accessible, false otherwise
     */
    public static boolean headDirectoryBucket(S3Client s3Client, String bucketName) {
        logger.info("Checking if bucket exists: {}", bucketName);

        try {
            // Create a HeadBucketRequest
            HeadBucketRequest headBucketRequest = HeadBucketRequest.builder()
                    .bucket(bucketName)
                    .build();
            // If the bucket doesn't exist, the following statement throws NoSuchBucketException,
            // which is a subclass of S3Exception.
            s3Client.headBucket(headBucketRequest);
            logger.info("Amazon S3 directory bucket: \"{}\" found.", bucketName);
            return true;

        } catch (S3Exception e) {
            logger.error("Failed to access bucket: {} - Error code: {}", e.awsErrorDetails().errorMessage(),
                    e.awsErrorDetails().errorCode(), e);
            throw e;
        }
    }
```
+  如需 API 詳細資訊，請參閱《AWS SDK for Java 2.x API 參考》**中的 [HeadBucket](https://docs.aws.amazon.com/goto/SdkForJavaV2/s3-2006-03-01/HeadBucket)。

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