从 Amazon S3 on Outposts 存储桶获取对象 - Amazon Simple Storage Service
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从 Amazon S3 on Outposts 存储桶获取对象

对象是 Amazon S3 on Outposts 中存储的基础实体。每个对象都储存在一个存储桶中。您必须使用访问点才能访问 Outpost 存储桶中的任何对象。当您指定存储桶以执行对象操作时,请使用访问点 Amazon Resource Name (ARN),其中包括 Outpost 所属区域的 Amazon Web Services 区域代码、Amazon Web Services 账户 ID、Outpost ID 和访问点名称。以下示例显示对象操作中用于 S3 on Outposts 访问点的 ARN 格式:

arn:aws:s3-outposts:region:account-id:outpost/outpost-id/accesspoint/accesspoint-name

有关 S3 on Outposts ARN 的更多信息,请参阅S3 on Outposts 的资源 ARN

对于 Amazon S3 on Outposts,对象数据始终存储在 Outpost 上。当 Amazon 安装 Outpost 机架时,您的数据将保留在 Outpost 的本地,以满足数据驻留要求。您的对象永远不会离开您的 Outpost,也不在 Amazon Web Services 区域 中。由于 Amazon Web Services Management Console 托管在区域内,您无法使用控制台上传或管理 Outpost 中的对象。但是,您可以使用 REST API、Amazon Command Line Interface (Amazon CLI) 和 Amazon SDK 通过访问点上传和管理对象。

下面的示例演示如何使用 Amazon Command Line Interface (Amazon CLI) 和Amazon SDK for Java 下载(获取)对象。

以下示例使用 Amazon CLI 从 S3 on Outposts 存储桶 (s3-outposts:GetObject) 获取一个名为 sample-object.xml 的对象。要使用此命令,请将每个 user input placeholder 替换为您自己的信息。有关此命令的更多信息,请参阅《Amazon CLI 参考》https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3api/get-object.html中的 get-object

aws s3api get-object --bucket arn:aws:s3-outposts:region:123456789012:outpost/op-01ac5d28a6a232904/accesspoint/example-outposts-access-point --key testkey sample-object.xml

以下 S3 on Outposts 示例使用适用于 Java 的 SDK 获取对象。要使用此示例,请将每个 user input placeholder 替换为您自己的信息。有关更多信息,请参阅 Amazon Simple Storage Service API 参考中的 GetObject

import com.amazonaws.AmazonServiceException; import com.amazonaws.SdkClientException; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3ClientBuilder; import com.amazonaws.services.s3.model.GetObjectRequest; import com.amazonaws.services.s3.model.ResponseHeaderOverrides; import com.amazonaws.services.s3.model.S3Object; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class GetObject { public static void main(String[] args) throws IOException { String accessPointArn = "*** access point ARN ***"; String key = "*** Object key ***"; S3Object fullObject = null, objectPortion = null, headerOverrideObject = null; try { // This code expects that you have Amazon credentials set up per: // https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html AmazonS3 s3Client = AmazonS3ClientBuilder.standard() .enableUseArnRegion() .build(); // Get an object and print its contents. System.out.println("Downloading an object"); fullObject = s3Client.getObject(new GetObjectRequest(accessPointArn, key)); System.out.println("Content-Type: " + fullObject.getObjectMetadata().getContentType()); System.out.println("Content: "); displayTextInputStream(fullObject.getObjectContent()); // Get a range of bytes from an object and print the bytes. GetObjectRequest rangeObjectRequest = new GetObjectRequest(accessPointArn, key) .withRange(0, 9); objectPortion = s3Client.getObject(rangeObjectRequest); System.out.println("Printing bytes retrieved."); displayTextInputStream(objectPortion.getObjectContent()); // Get an entire object, overriding the specified response headers, and print the object's content. ResponseHeaderOverrides headerOverrides = new ResponseHeaderOverrides() .withCacheControl("No-cache") .withContentDisposition("attachment; filename=example.txt"); GetObjectRequest getObjectRequestHeaderOverride = new GetObjectRequest(accessPointArn, key) .withResponseHeaders(headerOverrides); headerOverrideObject = s3Client.getObject(getObjectRequestHeaderOverride); displayTextInputStream(headerOverrideObject.getObjectContent()); } catch (AmazonServiceException e) { // The call was transmitted successfully, but Amazon S3 couldn't process // it, so it returned an error response. e.printStackTrace(); } catch (SdkClientException e) { // Amazon S3 couldn't be contacted for a response, or the client // couldn't parse the response from Amazon S3. e.printStackTrace(); } finally { // To ensure that the network connection doesn't remain open, close any open input streams. if (fullObject != null) { fullObject.close(); } if (objectPortion != null) { objectPortion.close(); } if (headerOverrideObject != null) { headerOverrideObject.close(); } } } private static void displayTextInputStream(InputStream input) throws IOException { // Read the text input stream one line at a time and display each line. BufferedReader reader = new BufferedReader(new InputStreamReader(input)); String line = null; while ((line = reader.readLine()) != null) { System.out.println(line); } System.out.println(); } }