文档 AWS SDK 示例 GitHub 存储库中还有更多 [S AWS DK 示例](https://github.com/awsdocs/aws-doc-sdk-examples)。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

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

以下代码示例演示了如何使用 `HeadBucket`。

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#### [ Java ]

**适用于 Java 的 SDK 2.x**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/s3/src/main/java/com/example/s3/directorybucket#code-examples)中查找完整示例，了解如何进行设置和运行。
检查指定的 S3 目录存储桶是否存在并且可供访问。  

```
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;
        }
    }
```
+  有关 API 的详细信息，请参阅 *AWS SDK for Java 2.x API 参考[HeadBucket](https://docs.aws.amazon.com/goto/SdkForJavaV2/s3-2006-03-01/HeadBucket)*中的。

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