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# 使用適用於 Java 的開發套件執行和管理分段上傳
<a name="S3OutpostsMPU"></a>

使用 Amazon S3 on Outposts，您可以在 AWS Outposts 資源上建立 S3 儲存貯體，並為需要本機資料存取、本機資料處理和資料駐留的應用程式在內部部署存放和擷取物件。您可以透過 AWS 管理主控台、 AWS Command Line Interface (AWS CLI)、SDK 或 REST API 使用 S3 on Outposts。 AWS SDKs 如需詳細資訊，請參閱[什麼是 Amazon S3 on Outposts？](S3onOutposts.md) 

下列範例示範如何搭配 使用 S3 on Outposts 適用於 Java 的 AWS SDK ，以執行和管理分段上傳。

**Topics**
+ [在 S3 on Outposts 儲存貯體中執行物件的分段上傳](#S3OutpostsInitiateMultipartUploadJava)
+ [使用分段上傳在 S3 on Outposts 儲存貯體中複製大型物件](#S3OutpostsCopyPartJava)
+ [列出 S3 on Outposts 儲存貯體中物件的片段](#S3OutpostsListPartsJava)
+ [擷取 S3 on Outposts 儲存貯體中進行中的分段上傳清單](#S3OutpostsListMultipartUploadsJava)

## 在 S3 on Outposts 儲存貯體中執行物件的分段上傳
<a name="S3OutpostsInitiateMultipartUploadJava"></a>

下列 S3 on Outposts 範例使用適用於 Java 的開發套件，在 Outposts 儲存貯體啟動、上傳和完成物件的分段上傳。若要使用此範例，請以您自己的資訊取代每個 `{{user input placeholder}}`。如需詳細資訊，請參閱《Amazon Simple Storage Service 使用者指南》**中的[使用分段上傳來上傳物件](https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpu-upload-object.html)。

```
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.*;

import java.util.ArrayList;
import java.util.List;

public class MultipartUploadCopy {
    public static void main(String[] args) {
        String accessPointArn = "{{*** Source access point ARN ***}}";
        String sourceObjectKey = "{{*** Source object key ***}}";
        String destObjectKey = "{{*** Target object key ***}}";

        try {
            // This code expects that you have AWS credentials set up per:
            // https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .enableUseArnRegion()
                    .build();

            // Initiate the multipart upload.
            InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(accessPointArn, destObjectKey);
            InitiateMultipartUploadResult initResult = s3Client.initiateMultipartUpload(initRequest);

            // Get the object size to track the end of the copy operation.
            GetObjectMetadataRequest metadataRequest = new GetObjectMetadataRequest(accessPointArn, sourceObjectKey);
            ObjectMetadata metadataResult = s3Client.getObjectMetadata(metadataRequest);
            long objectSize = metadataResult.getContentLength();

            // Copy the object using 5 MB parts.
            long partSize = 5 * 1024 * 1024;
            long bytePosition = 0;
            int partNum = 1;
            List<CopyPartResult> copyResponses = new ArrayList<CopyPartResult>();
            while (bytePosition < objectSize) {
                // The last part might be smaller than partSize, so check to make sure
                // that lastByte isn't beyond the end of the object.
                long lastByte = Math.min(bytePosition + partSize - 1, objectSize - 1);

                // Copy this part.
                CopyPartRequest copyRequest = new CopyPartRequest()
                        .withSourceBucketName(accessPointArn)
                        .withSourceKey(sourceObjectKey)
                        .withDestinationBucketName(accessPointArn)
                        .withDestinationKey(destObjectKey)
                        .withUploadId(initResult.getUploadId())
                        .withFirstByte(bytePosition)
                        .withLastByte(lastByte)
                        .withPartNumber(partNum++);
                copyResponses.add(s3Client.copyPart(copyRequest));
                bytePosition += partSize;
            }

            // Complete the upload request to concatenate all uploaded parts and make the copied object available.
            CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest(
                    accessPointArn,
                    destObjectKey,
                    initResult.getUploadId(),
                    getETags(copyResponses));
            s3Client.completeMultipartUpload(completeRequest);
            System.out.println("Multipart copy complete.");
        } 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();
        }
    }

    // This is a helper function to construct a list of ETags.
    private static List<PartETag> getETags(List<CopyPartResult> responses) {
        List<PartETag> etags = new ArrayList<PartETag>();
        for (CopyPartResult response : responses) {
            etags.add(new PartETag(response.getPartNumber(), response.getETag()));
        }
        return etags;
    }
```

## 使用分段上傳在 S3 on Outposts 儲存貯體中複製大型物件
<a name="S3OutpostsCopyPartJava"></a>

下列 S3 on Outposts 範例使用適用於 Java 的開發套件在儲存貯體中複製物件。若要使用此範例，請以您自己的資訊取代每個 `{{user input placeholder}}`。

```
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.*;

import java.util.ArrayList;
import java.util.List;

public class MultipartUploadCopy {
    public static void main(String[] args) {
        String accessPointArn = "{{*** Source access point ARN ***}}";
        String sourceObjectKey = "{{*** Source object key ***}}";
        String destObjectKey = "{{*** Target object key ***}}";

        try {
            // This code expects that you have AWS credentials set up per:
            // https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .enableUseArnRegion()
                    .build();

            // Initiate the multipart upload.
            InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(accessPointArn, destObjectKey);
            InitiateMultipartUploadResult initResult = s3Client.initiateMultipartUpload(initRequest);

            // Get the object size to track the end of the copy operation.
            GetObjectMetadataRequest metadataRequest = new GetObjectMetadataRequest(accessPointArn, sourceObjectKey);
            ObjectMetadata metadataResult = s3Client.getObjectMetadata(metadataRequest);
            long objectSize = metadataResult.getContentLength();

            // Copy the object using 5 MB parts.
            long partSize = 5 * 1024 * 1024;
            long bytePosition = 0;
            int partNum = 1;
            List<CopyPartResult> copyResponses = new ArrayList<CopyPartResult>();
            while (bytePosition < objectSize) {
                // The last part might be smaller than partSize, so check to make sure
                // that lastByte isn't beyond the end of the object.
                long lastByte = Math.min(bytePosition + partSize - 1, objectSize - 1);

                // Copy this part.
                CopyPartRequest copyRequest = new CopyPartRequest()
                        .withSourceBucketName(accessPointArn)
                        .withSourceKey(sourceObjectKey)
                        .withDestinationBucketName(accessPointArn)
                        .withDestinationKey(destObjectKey)
                        .withUploadId(initResult.getUploadId())
                        .withFirstByte(bytePosition)
                        .withLastByte(lastByte)
                        .withPartNumber(partNum++);
                copyResponses.add(s3Client.copyPart(copyRequest));
                bytePosition += partSize;
            }

            // Complete the upload request to concatenate all uploaded parts and make the copied object available.
            CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest(
                    accessPointArn,
                    destObjectKey,
                    initResult.getUploadId(),
                    getETags(copyResponses));
            s3Client.completeMultipartUpload(completeRequest);
            System.out.println("Multipart copy complete.");
        } 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();
        }
    }

    // This is a helper function to construct a list of ETags.
    private static List<PartETag> getETags(List<CopyPartResult> responses) {
        List<PartETag> etags = new ArrayList<PartETag>();
        for (CopyPartResult response : responses) {
            etags.add(new PartETag(response.getPartNumber(), response.getETag()));
        }
        return etags;
    }
}
```

## 列出 S3 on Outposts 儲存貯體中物件的片段
<a name="S3OutpostsListPartsJava"></a>

下列 S3 on Outposts 範例使用適用於 Java 的開發套件，在儲存貯體中列出物件的片段。若要使用此範例，請以您自己的資訊取代每個 `{{user input placeholder}}`。

```
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.*;

import java.util.List;

public class ListParts {
    public static void main(String[] args) {
        String accessPointArn = "{{*** access point ARN ***}}";
        String keyName = "{{*** Key name ***}}";
        String uploadId = "{{*** Upload ID ***}}";

        try {
            // This code expects that you have AWS credentials set up per:
            // https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .enableUseArnRegion()
                    .build();

            ListPartsRequest listPartsRequest = new ListPartsRequest(accessPointArn, keyName, uploadId);
            PartListing partListing = s3Client.listParts(listPartsRequest);
            List<PartSummary> partSummaries = partListing.getParts();

            System.out.println(partSummaries.size() + " multipart upload parts");
            for (PartSummary p : partSummaries) {
                System.out.println("Upload part: Part number = \"" + p.getPartNumber() + "\", ETag = " + p.getETag());
            }

        } 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();
        }
    }
}
```

## 擷取 S3 on Outposts 儲存貯體中進行中的分段上傳清單
<a name="S3OutpostsListMultipartUploadsJava"></a>

下列 S3 on Outposts 範例顯示如何使用適用於 Java 的開發套件，從 Outposts 儲存貯體擷取進行中的分段上傳清單。若要使用此範例，請以您自己的資訊取代每個 `{{user input placeholder}}`。

```
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.ListMultipartUploadsRequest;
import com.amazonaws.services.s3.model.MultipartUpload;
import com.amazonaws.services.s3.model.MultipartUploadListing;

import java.util.List;

public class ListMultipartUploads {
    public static void main(String[] args) {
                String accessPointArn = "{{*** access point ARN ***}}";

        try {
            // This code expects that you have AWS credentials set up per:
            // https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .enableUseArnRegion()
                    .build();

            // Retrieve a list of all in-progress multipart uploads.
            ListMultipartUploadsRequest allMultipartUploadsRequest = new ListMultipartUploadsRequest(accessPointArn);
            MultipartUploadListing multipartUploadListing = s3Client.listMultipartUploads(allMultipartUploadsRequest);
            List<MultipartUpload> uploads = multipartUploadListing.getMultipartUploads();

            // Display information about all in-progress multipart uploads.
            System.out.println(uploads.size() + " multipart upload(s) in progress.");
            for (MultipartUpload u : uploads) {
                System.out.println("Upload in progress: Key = \"" + u.getKey() + "\", id = " + u.getUploadId());
            }
        } 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();
        }
    }
}
```