搭HeadBucket配 AWS SDK 或命令列工具使用 - Amazon Simple Storage Service

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配 AWS SDK 或命令列工具使用

下列程式碼範例會示範如何使用HeadBucket

Bash
AWS CLI 與 Bash 腳本
注意

還有更多關於 GitHub。尋找完整範例,並了解如何在AWS 設定和執行程式碼範例儲存庫

############################################################################### # function bucket_exists # # This function checks to see if the specified bucket already exists. # # Parameters: # $1 - The name of the bucket to check. # # Returns: # 0 - If the bucket already exists. # 1 - If the bucket doesn't exist. ############################################################################### function bucket_exists() { local bucket_name bucket_name=$1 # Check whether the bucket already exists. # We suppress all output - we're interested only in the return code. if aws s3api head-bucket \ --bucket "$bucket_name" \ >/dev/null 2>&1; then return 0 # 0 in Bash script means true. else return 1 # 1 in Bash script means false. fi }
  • 如需 API 詳細資訊,請參閱AWS CLI 命令參考HeadBucket中的。

CLI
AWS CLI

下列指令會驗證儲存貯體的存取權:my-bucket

aws s3api head-bucket --bucket my-bucket

如果存在值區且您可以存取該值區,則不會傳回任何輸出。否則,將顯示錯誤消息。例如:

A client error (404) occurred when calling the HeadBucket operation: Not Found
  • 如需 API 詳細資訊,請參閱AWS CLI 命令參考HeadBucket中的。

Go
SDK for Go V2
注意

還有更多關於 GitHub。尋找完整範例,並了解如何在AWS 設定和執行程式碼範例儲存庫

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions // used in the examples. // It contains S3Client, an Amazon S3 service client that is used to perform bucket // and object actions. type BucketBasics struct { S3Client *s3.Client } // BucketExists checks whether a bucket exists in the current account. func (basics BucketBasics) BucketExists(bucketName string) (bool, error) { _, err := basics.S3Client.HeadBucket(context.TODO(), &s3.HeadBucketInput{ Bucket: aws.String(bucketName), }) exists := true if err != nil { var apiError smithy.APIError if errors.As(err, &apiError) { switch apiError.(type) { case *types.NotFound: log.Printf("Bucket %v is available.\n", bucketName) exists = false err = nil default: log.Printf("Either you don't have access to bucket %v or another error occurred. "+ "Here's what happened: %v\n", bucketName, err) } } } else { log.Printf("Bucket %v exists and you already own it.", bucketName) } return exists, err }
  • 如需 API 詳細資訊,請參閱 AWS SDK for Go API 參考HeadBucket中的。

Python
適用於 Python (Boto3) 的 SDK
注意

還有更多關於 GitHub。尋找完整範例,並了解如何在AWS 設定和執行程式碼範例儲存庫

class BucketWrapper: """Encapsulates S3 bucket actions.""" def __init__(self, bucket): """ :param bucket: A Boto3 Bucket resource. This is a high-level resource in Boto3 that wraps bucket actions in a class-like structure. """ self.bucket = bucket self.name = bucket.name def exists(self): """ Determine whether the bucket exists and you have access to it. :return: True when the bucket exists; otherwise, False. """ try: self.bucket.meta.client.head_bucket(Bucket=self.bucket.name) logger.info("Bucket %s exists.", self.bucket.name) exists = True except ClientError: logger.warning( "Bucket %s doesn't exist or you don't have access to it.", self.bucket.name, ) exists = False return exists
  • 如需 API 的詳細資訊,請參閱AWS 開發套件HeadBucket中的 Python (博托 3) API 參考。

如需 AWS SDK 開發人員指南和程式碼範例的完整清單,請參閱透過 AWS SDK 使用此服務。此主題也包含有關入門的資訊和舊版 SDK 的詳細資訊。