Object Storage Service:Copy objects (OSS SDK for Java V1)

The following code shows how to copy a small object:

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.*;

public class Demo {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint for the China (Hangzhou) region is used. Specify your actual endpoint.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Obtain access credentials from environment variables. Before you run this code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the name of the source bucket.
        String sourceBucketName = "srcexamplebucket";
        // Specify the full path of the source object. Do not include the bucket name in the full path.
        String sourceObjectName = "srcexampleobject.txt";
        // Specify the name of the destination bucket. The destination bucket must be in the same region as the source bucket.
        String destinationBucketName = "desexamplebucket";
        // Specify the full path of the destination object. Do not include the bucket name in the full path.
        String destinationObjectName = "desexampleobject.txt";
        String versionId  = "CAEQMxiBgICAof2D0BYiIDJhMGE3N2M1YTI1NDQzOGY5NTkyNTI3MGYyMzJm****";
        // Specify the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // When the OSSClient instance is no longer needed, call the shutdown method to release its resources.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();

        try {
            CopyObjectRequest copyObjectRequest = new CopyObjectRequest(sourceBucketName, sourceObjectName, destinationBucketName, destinationObjectName);
            copyObjectRequest.setSourceVersionId(versionId);
            CopyObjectResult copyObjectResult = ossClient.copyObject(copyObjectRequest);
            System.out.println("ETag: " + copyObjectResult.getETag() + " LastModified: " + copyObjectResult.getLastModified());
            System.out.println("dest object versionid: " + copyObjectResult.getVersionId());
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

By default, the UploadPartCopy operation uploads a part by copying data from the current version of a source object. You can copy data from a specific version of an object by including the versionId subresource in the x-oss-copy-source request header. For example: x-oss-copy-source: /SourceBucketName/SourceObjectName?versionId=111111.

The following code shows how to perform a multipart copy:

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.*;
import java.util.ArrayList;
import java.util.List;

public class Demo {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint for the China (Hangzhou) region is used. Specify your actual endpoint.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Obtain access credentials from environment variables. Before you run this code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the name of the source bucket.
        String sourceBucketName = "srcexamplebucket";
        // Specify the full path of the source object. Do not include the bucket name in the full path.
        String sourceObjectName = "srcexampleobject.txt";
        // Specify the name of the destination bucket. The destination bucket must be in the same region as the source bucket.
        String destinationBucketName = "desexamplebucket";
        // Specify the full path of the destination object. Do not include the bucket name in the full path.
        String destinationObjectName = "desexampleobject.txt";
        String sourceObjectVersionId  = "CAEQMxiBgICAof2D0BYiIDJhMGE3N2M1YTI1NDQzOGY5NTkyNTI3MGYyMzJm****";
        // Specify the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // When the OSSClient instance is no longer needed, call the shutdown method to release its resources.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();

        try {
            ObjectMetadata objectMetadata = ossClient.getObjectMetadata(sourceBucketName, sourceObjectName);
            // Get the size of the object to copy.
            long contentLength = objectMetadata.getContentLength();
            // Set the part size to 10 MB.
            long partSize = 1024 * 1024 * 10;
            // Calculate the total number of parts.
            int partCount = (int) (contentLength / partSize);
            if (contentLength % partSize != 0) {
                partCount++;
            }

            System.out.println("total part count:" + partCount);
            // Initialize the multipart copy. You can specify the metadata of the destination object in InitiateMultipartUploadRequest.
            InitiateMultipartUploadRequest initiateMultipartUploadRequest = new InitiateMultipartUploadRequest(destinationBucketName, destinationObjectName);
            InitiateMultipartUploadResult initiateMultipartUploadResult = ossClient.initiateMultipartUpload(initiateMultipartUploadRequest);
            String uploadId = initiateMultipartUploadResult.getUploadId();

            // Copy the object in parts.
            List<PartETag> partETags = new ArrayList<PartETag>();
            for (int i = 0; i < partCount; i++) {
                // Calculate the size of each part.
                long skipBytes = partSize * i;
                long size = partSize < contentLength - skipBytes ? partSize : contentLength - skipBytes;

                // Create an UploadPartCopyRequest. You can specify conditions in the request.
                UploadPartCopyRequest uploadPartCopyRequest =
                        new UploadPartCopyRequest(sourceBucketName, sourceObjectName, destinationBucketName, destinationObjectName);
                uploadPartCopyRequest.setUploadId(uploadId);
                uploadPartCopyRequest.setPartSize(size);
                uploadPartCopyRequest.setBeginIndex(skipBytes);
                uploadPartCopyRequest.setPartNumber(i + 1);
                // Specify the version ID of the source object.
                uploadPartCopyRequest.setSourceVersionId(sourceObjectVersionId);
                UploadPartCopyResult uploadPartCopyResult = ossClient.uploadPartCopy(uploadPartCopyRequest);

                // Save the returned part ETags in partETags.
                partETags.add(uploadPartCopyResult.getPartETag());
            }

            // Complete the multipart copy.
            CompleteMultipartUploadRequest completeMultipartUploadRequest = new CompleteMultipartUploadRequest(
                    destinationBucketName, destinationObjectName, uploadId, partETags);
            CompleteMultipartUploadResult completeMultipartUploadResult = ossClient.completeMultipartUpload(completeMultipartUploadRequest);
            // View the version ID of the destination object.
            System.out.println("object versionid: " + completeMultipartUploadResult.getVersionId());

        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}