.NET-SDK之如何实现管理文件（五）？

拷贝文件


在同一个区域（杭州，深圳，青岛等）中，用户可以对有操作权限的文件进行复制操作。

拷贝一个文件


通过 copyObject 方法我们可以拷贝一个文件，代码如下：

1. using Aliyun.OSS;
3. // 初始化OssClient
4. var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
6. /// <summary>
7. /// 拷贝文件
8. /// </summary>
9. /// <param name="sourceBucket">原文件所在存储空间的名称</param>
10. /// <param name="sourceKey">原文件的名称</param>
11. /// <param name="targetBucket">目标文件所在存储空间的名称</param>
12. /// <param name="targetKey">目标文件的名称</param>
13. public void CopyObect(string sourceBucket, string sourceKey, string targetBucket, string targetKey)
14. {
15.     try
16.     {
17.         var metadata = new ObjectMetadata();
18.         metadata.AddHeader(Util.HttpHeaders.ContentType, "text/html");
19.         var req = new CopyObjectRequest(sourceBucket, sourceKey, targetBucket, targetKey)
20.         {
21.             NewObjectMetadata = metadata
22.         };
23.         var ret = client.CopyObject(req);
25.         Console.WriteLine("Copy object succeeded");
26.         Console.WriteLine("文件的ETag:{0}", ret.ETag);
27.     }
28.     catch (Exception ex)
29.     {
30.         Console.WriteLine("Copy object failed. {0}", ex.Message);
31.     }
32. }

说明：

• 完整代码参考GitHub。
• 使用该方法拷贝的文件必须小于1G，否则会报错。若文件大于1G，使用下面的Upload Part Copy。

1. using Aliyun.OSS;
3. // 初始化OssClient
4. var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
6. public void InitiateMultipartUpload(string bucketName, string key)
7. {
8.     try
9.     {
10.         // 开始Multipart Upload
11.         var request = new InitiateMultipartUploadRequest(bucketName, key);
12.         var result = client.InitiateMultipartUpload(request);
14.         // 打印UploadId
15.         Console.WriteLine("Init multipart upload succeeded");
16.         Console.WriteLine("Upload Id:{0}", result.UploadId);
17.     }
18.     catch (Exception ex)
19.     {
20.         Console.WriteLine("Init multipart upload failed. {0}", ex.Message);
21.     }
22. }

说明： 完整代码参考 GitHub。

1. using Aliyun.OSS;
3. // 初始化OssClient
4. var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
6. public void UploadPartCopy(string sourceBucket, string sourceKey, string targetBucket, string targetKey, string uploadId)
7. {
8.     try
9.     {
10.         // 计算总共的分片个数
11.         var metadata = client.GetObjectMetadata(sourceBucket, sourceKey);
12.         var fileSize = metadata.ContentLength;
13.         var partCount = (int)fileSize / partSize;
14.         if (fileSize % partSize != 0)
15.         {
16.             partCount++;
17.         }
18.         // 开始分片拷贝
19.         var partETags = new List<PartETag>();
20.         for (var i = 0; i < partCount; i++)
21.         {
22.             var skipBytes = (long)partSize * i;
23.             var size = (partSize < fileSize - skipBytes) ? partSize : (fileSize - skipBytes);
24.             var request = new UploadPartCopyRequest(targetBucket, targetKey, sourceBucket, sourceKey, uploadId)
25.             {
26.                 PartSize = size,
27.                 PartNumber = i + 1,
28.                 BeginIndex = skipBytes
29.             };
31.             var result = client.UploadPartCopy(request);
32.             partETags.Add(result.PartETag);
33.         }
35.         Console.WriteLine("Upload part copy succeeded");
36.     }
37.     catch (Exception ex)
38.     {
39.         Console.WriteLine("Upload part copy failed. {0}", ex.Message);
40.     }

说明：

• 完整代码参考GitHub。
• 以上程序调用uploadPartCopy方法来拷贝每一个分片。
• 与UploadPart要求基本一致，需要通过BeginIndex来定位到此次上传片开头所对应的位置，同时需要通过SourceKey来指定拷贝的文件。