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檢查儲存貯體是否存在 - AWS SDK 程式碼範例

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。

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。

檢查儲存貯體是否存在

下列程式碼範例示範如何檢查儲存貯體是否存在。

Java
SDK for Java 2.x
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。

您可以使用下列doesBucketExists方法取代適用於 Java V1 的 SDK AmazonS3Client#doesBucketExistV2(字串) 方法。

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import software.amazon.awssdk.awscore.exception.AwsServiceException; import software.amazon.awssdk.http.HttpStatusCode; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.utils.Validate; public class DoesBucketExist { private static final Logger logger = LoggerFactory.getLogger(DoesBucketExist.class); public static void main(String[] args) { DoesBucketExist doesBucketExist = new DoesBucketExist(); final S3Client s3SyncClient = S3Client.builder().build(); final String bucketName = "amzn-s3-demo-bucket"; // Change to the bucket name that you want to check. boolean exists = doesBucketExist.doesBucketExist(bucketName, s3SyncClient); logger.info("Bucket exists: {}", exists); } /** * Checks if the specified bucket exists. Amazon S3 buckets are named in a global namespace; use this method to * determine if a specified bucket name already exists, and therefore can't be used to create a new bucket. * <p> * Internally this method uses the <a * href="https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/s3/S3Client.html#getBucketAcl(java.util.function.Consumer)">S3Client.getBucketAcl(String)</a> * operation to determine whether the bucket exists. * <p> * This method is equivalent to the AWS SDK for Java V1's <a * href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Client.html#doesBucketExistV2-java.lang.String-">AmazonS3Client#doesBucketExistV2(String)</a>. * * @param bucketName The name of the bucket to check. * @param s3SyncClient An <code>S3Client</code> instance. The method checks for the bucket in the AWS Region * configured on the instance. * @return The value true if the specified bucket exists in Amazon S3; the value false if there is no bucket in * Amazon S3 with that name. */ public boolean doesBucketExist(String bucketName, S3Client s3SyncClient) { try { Validate.notEmpty(bucketName, "The bucket name must not be null or an empty string.", ""); s3SyncClient.getBucketAcl(r -> r.bucket(bucketName)); return true; } catch (AwsServiceException ase) { // A redirect error or an AccessDenied exception means the bucket exists but it's not in this region // or we don't have permissions to it. if ((ase.statusCode() == HttpStatusCode.MOVED_PERMANENTLY) || "AccessDenied".equals(ase.awsErrorDetails().errorCode())) { return true; } if (ase.statusCode() == HttpStatusCode.NOT_FOUND) { return false; } throw ase; } } }
  • 如需 API 詳細資訊,請參閱《AWS SDK for Java 2.x API 參考》中的 GetBucketAcl

SDK for Java 2.x
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。

您可以使用下列doesBucketExists方法取代適用於 Java V1 的 SDK AmazonS3Client#doesBucketExistV2(字串) 方法。

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import software.amazon.awssdk.awscore.exception.AwsServiceException; import software.amazon.awssdk.http.HttpStatusCode; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.utils.Validate; public class DoesBucketExist { private static final Logger logger = LoggerFactory.getLogger(DoesBucketExist.class); public static void main(String[] args) { DoesBucketExist doesBucketExist = new DoesBucketExist(); final S3Client s3SyncClient = S3Client.builder().build(); final String bucketName = "amzn-s3-demo-bucket"; // Change to the bucket name that you want to check. boolean exists = doesBucketExist.doesBucketExist(bucketName, s3SyncClient); logger.info("Bucket exists: {}", exists); } /** * Checks if the specified bucket exists. Amazon S3 buckets are named in a global namespace; use this method to * determine if a specified bucket name already exists, and therefore can't be used to create a new bucket. * <p> * Internally this method uses the <a * href="https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/s3/S3Client.html#getBucketAcl(java.util.function.Consumer)">S3Client.getBucketAcl(String)</a> * operation to determine whether the bucket exists. * <p> * This method is equivalent to the AWS SDK for Java V1's <a * href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Client.html#doesBucketExistV2-java.lang.String-">AmazonS3Client#doesBucketExistV2(String)</a>. * * @param bucketName The name of the bucket to check. * @param s3SyncClient An <code>S3Client</code> instance. The method checks for the bucket in the AWS Region * configured on the instance. * @return The value true if the specified bucket exists in Amazon S3; the value false if there is no bucket in * Amazon S3 with that name. */ public boolean doesBucketExist(String bucketName, S3Client s3SyncClient) { try { Validate.notEmpty(bucketName, "The bucket name must not be null or an empty string.", ""); s3SyncClient.getBucketAcl(r -> r.bucket(bucketName)); return true; } catch (AwsServiceException ase) { // A redirect error or an AccessDenied exception means the bucket exists but it's not in this region // or we don't have permissions to it. if ((ase.statusCode() == HttpStatusCode.MOVED_PERMANENTLY) || "AccessDenied".equals(ase.awsErrorDetails().errorCode())) { return true; } if (ase.statusCode() == HttpStatusCode.NOT_FOUND) { return false; } throw ase; } } }
  • 如需 API 詳細資訊,請參閱《AWS SDK for Java 2.x API 參考》中的 GetBucketAcl

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