# 将 `PutBucketPolicy` 和 AWS SDK 搭配使用
<a name="s3-directory-buckets_example_s3-directory-buckets_PutBucketPolicy_section"></a>

以下代码示例演示了如何使用 `PutBucketPolicy`。

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#### [ Java ]

**适用于 Java 的 SDK 2.x**  
 查看 GitHub，了解更多信息。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。
将存储桶策略应用于目录存储桶。  

```
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.PutBucketPolicyRequest;
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;
import static com.example.s3.util.S3DirectoryBucketUtils.getAwsAccountId;

    /**
     * Sets the following bucket policy for the specified S3 directory bucket.
     *<pre>
     * {
     *     "Version":"2012-10-17",		 	 	 
     *     "Statement": [
     *         {
     *             "Sid": "AdminPolicy",
     *             "Effect": "Allow",
     *             "Principal": {
     *                 "AWS": "arn:aws:iam::<ACCOUNT_ID>:root"
     *             },
     *             "Action": "s3express:*",
     *             "Resource": "arn:aws:s3express:us-west-2:<ACCOUNT_ID>:bucket/<DIR_BUCKET_NAME>
     *         }
     *     ]
     * }
     * </pre>
     * This policy grants all S3 directory bucket actions to identities in the same account as the bucket.
     *
     * @param s3Client   The S3 client used to interact with S3
     * @param bucketName The name of the directory bucket
     * @param policyText The policy text to be applied
     */
    public static void putDirectoryBucketPolicy(S3Client s3Client, String bucketName, String policyText) {
        logger.info("Setting policy on bucket: {}", bucketName);
        logger.info("Policy: {}", policyText);

        try {
            PutBucketPolicyRequest policyReq = PutBucketPolicyRequest.builder()
                    .bucket(bucketName)
                    .policy(policyText)
                    .build();

            s3Client.putBucketPolicy(policyReq);
            logger.info("Bucket policy set successfully!");

        } catch (S3Exception e) {
            logger.error("Failed to set bucket policy: {} - Error code: {}", e.awsErrorDetails().errorMessage(),
                    e.awsErrorDetails().errorCode(), e);
            throw e;
        }
    }
```
+  有关 API 详细信息，请参阅《AWS SDK for Java 2.x API Reference》**中的 [PutBucketPolicy](https://docs.aws.amazon.com/goto/SdkForJavaV2/s3-2006-03-01/PutBucketPolicy)。

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有关 AWS SDK 开发人员指南和代码示例的完整列表，请参阅 [使用 AWS SDK 通过 Amazon S3 进行开发](sdk-general-information-section.md)。本主题还包括有关入门的信息以及有关先前的 SDK 版本的详细信息。