Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceJavaObject InterfaceCopy ObjectMultipart Copy (Java SDK)
Copy page
Download PDFCopy Object
Multipart Copy (Java SDK)
Copy pageDownload PDFMultipart Copy (Java SDK)
When an object exceeds 5GiB in size, you can use the uploadPartCopy interface of the TOS Java SDK to perform multipart copy.
Category
- Copying files between buckets across regions is not supported.
- When copying an object, the account must have read permission for the source object and write permission for the destination bucket.
- When copying an object, you can retain all metadata (default) or specify new metadata. However, the ACL was not retained; instead, it was set to private.
Sample Code
The following code demonstrates how to multipart copy the srcObjectKey object in the srcBucketName bucket to the bucketName bucket, and set the object name to objectKey.
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosClientException;
import com.volcengine.tos.TosServerException;
import com.volcengine.tos.model.object.*;
import java.util.ArrayList;
import java.util.List;
public class UploadPartCopyExample {
public static void main(String[] args) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = System.getenv("TOS_ACCESS_KEY");
String secretKey = System.getenv("TOS_SECRET_KEY");
String srcBucketName = "src-bucket-example";
String srcObjectKey = "src_example_dir/example_object.txt";
String bucketName = "bucket-example";
String objectKey = "dst_example_dir/example_object.txt";
long partSize = 10 * 1024 * 1024;
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);
try{
HeadObjectV2Output headInfo = tos.headObject(new HeadObjectV2Input().setBucket(srcBucketName).setKey(srcObjectKey));
long contentLength = headInfo.getContentLength();
CreateMultipartUploadInput create = new CreateMultipartUploadInput().setBucket(bucketName).setKey(objectKey);
CreateMultipartUploadOutput created = tos.createMultipartUpload(create);
String uploadID = created.getUploadID();
List<UploadedPartV2> partList = new ArrayList<>();
long rangeStart = 0, rangeEnd = 0;
int partNumber = 1;
while (rangeStart < contentLength) {
rangeEnd = Math.min(rangeStart + partSize - 1, contentLength - 1);
UploadPartCopyV2Input input = new UploadPartCopyV2Input().setBucket(bucketName).setKey(objectKey)
.setUploadID(uploadID).setSourceBucket(srcBucketName).setSourceKey(srcObjectKey)
.setPartNumber(partNumber).setCopySourceRange(rangeStart, rangeEnd);
UploadPartCopyV2Output output = tos.uploadPartCopy(input);
System.out.println("uploadPartCopy succeed, part's etag is " + output.getEtag());
System.out.println("uploadPartCopy succeed, part's partNumber is " + output.getPartNumber());
partList.add(new UploadedPartV2().setEtag(output.getEtag()).setPartNumber(output.getPartNumber()));
rangeStart = rangeEnd + 1;
partNumber++;
}
CompleteMultipartUploadV2Input complete = new CompleteMultipartUploadV2Input().setBucket(bucketName)
.setKey(objectKey).setUploadID(uploadID).setUploadedParts(partList);
CompleteMultipartUploadV2Output output = tos.completeMultipartUpload(complete);
System.out.println("copyObject succeed, object's etag is " + output.getEtag());
System.out.println("copyObject succeed, object's crc64 is " + output.getHashCrc64ecma());
} catch (TosClientException e) {
System.out.println("copyObject failed");
System.out.println("Message: " + e.getMessage());
if (e.getCause() != null) {
e.getCause().printStackTrace();
}
} catch (TosServerException e) {
System.out.println("copyObject failed");
System.out.println("StatusCode: " + e.getStatusCode());
System.out.println("Code: " + e.getCode());
System.out.println("Message: " + e.getMessage());
System.out.println("RequestID: " + e.getRequestID());
} catch (Throwable t) {
System.out.println("copyObject failed");
System.out.println("unexpected exception, message: " + t.getMessage());
}
}
}
Related documentation
- For the API documentation on creating multipart upload tasks, see CreateMultipartUpload.
- For API documentation on part copy, see UploadPartCopy.
- For API documentation on merging parts, refer to CompleteMultipartUpload.
Last updated: 2026.02.10 15:04:34
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