C#

最近更新时间:2019-01-14 10:11:00

KS3 SDK For C# 使用指南


目录


1 概述

此SDK适用于.net framework4.0及以上版本。基于KS3 API 构建。使用此 SDK 构建您的网络应用程序,能让您以非常便捷地方式将数据安全地存储到金山云存储上。无论您的网络应用是一个网站程序,还是包括从云端(服务端程序)到终端(手持设备应用)的架构的服务或应用,通过KS3存储及其 SDK,都能让您应用程序的终端用户高速上传和下载,同时也让您的服务端更加轻盈。

2 环境准备

配置.net framework4.0 以上开发环境

下载KS3 SDK For C#

由于在App端明文存储AccessKey、SecretKey是极不安全的,因此推荐的使用场景如下图所示:

ks3csharpsdkauthlistener 1.png

3 初始化

3.1 获取密钥

1、开通KS3服务,https://www.ksyun.com/user/register 注册账号

2、进入控制台, https://ks3.console.ksyun.com/console.html#/setting 获取AccessKeyID 、AccessKeySecret

3.2 初始化客户端

当以上全部完成之后用户便可初始化客户端进行操作了

String accessKey = "YOUR ACCESS KEY";

String secretKey = "YOUR SECRET KEY";

String bucketName = "YOUR BUCKET NAME";

String objKeyName = "YOUR OBJECT KEY";

   String endPoint = "ks3-cn-beijing.ksyun.com";    //此处以北京region为例

ks3Client = new KS3Client(accessKey, secretKey);

ks3Client.setEndpoint(endPoint);

4 使用示例

4.1 List Buckets
使用示例

列出当前用户的所有bucket,可以查看每个bucket的名称、创建时间以及所有者

private static bool listBuckets()

    {

        // List Buckets

        try

        {

            IList<Bucket> bucketsList = ks3Client.listBuckets();

            foreach (Bucket b in bucketsList)

            {

                Console.WriteLine(b.ToString());

            }

        }

        catch (System.Exception e)

        {

            return false;

        }

        return true;

    }
4.2 DELETE Bucket
使用示例

删除一个Bucket

private static bool deleteBucket()

    {

        // Delete Bucket

        try

        {

            ks3Client.deleteBucket(bucketName);

        }

        catch (System.Exception e)

        {

            return false;

        }

        return true;

    }
4.3 List Objects
使用示例

列出<bucket名称>下的所有object,最大上限是1000个

private static bool listObjects()

    {

        try

        {

            // List Objects

            Console.WriteLine("--- List Objects: ---");

            ObjectListing objects = ks3Client.listObjects(bucketName);

            Console.WriteLine(objects.ToString());

            Console.WriteLine("---------------------\n");

            // Get Object Metadata

            Console.WriteLine("--- Get Object Metadata ---");

            ObjectMetadata objMeta = ks3Client.getObjectMetadata(bucketName, objKeyName);

            Console.WriteLine(objMeta.ToString());

            Console.WriteLine("---------------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());        

            return false;

        }

        return true;

    }
4.4 GET Bucket acl
使用示例

获取<bucket名称>的acl控制权限

private static bool getBucketACL()

    {

        // Get Bucket ACL

        try

        {

            Console.WriteLine("--- Get Bucket ACL: ---");

            AccessControlList acl = ks3Client.getBucketAcl(bucketName);

            Console.WriteLine("Bucket Name: " + bucketName);

            Console.WriteLine(acl.ToString());

            Console.WriteLine("-----------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.5 List Multipart Uploads
使用示例

列出当前正在执行的分块上传

 private static ListMultipartUploadsResult listMultipartUploads(string bucket,string objKey,string uploadId) {

        ListMultipartUploadsRequest request = new ListMultipartUploadsRequest(bucket,objKey,uploadId);

        ListMultipartUploadsResult result =ks3Client.getListMultipartUploads(request);

        return result;

    }
4.6 Create Bucket
使用示例

新建一个<bucket名称>

private static bool createBucket()

    {

        // Create Bucket

        try

        {

            Console.WriteLine("--- Create Bucket: ---");

            Console.WriteLine("Bucket Name: " + bucketName);

            Bucket bucket = ks3Client.createBucket(bucketName);

            Console.WriteLine("Success.");

            Console.WriteLine("----------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine("Create Bucket Fail! " + e.ToString());               

            return false;

        }

        return true;

    }

注:这里如果出现409 conflict错误,说明请求的bucket name有冲突,因为bucket name是全局唯一的

4.7 PUT Bucket acl
使用示例

设置<bucket名称>的访问权限

private static bool setBucketACL()

    {

        // Set Bucket ACL

        try

        {

            Console.WriteLine("--- Set Bucket ACL: ---");

            CannedAccessControlList cannedAcl = new CannedAccessControlList(CannedAccessControlList.PUBLICK_READ_WRITE);

            ks3Client.setBucketAcl(bucketName, cannedAcl);

            Console.WriteLine("Bucket Name: " + bucketName);

            Console.WriteLine("Success, now the ACL is:\n" + ks3Client.getBucketAcl(bucketName));

            Console.WriteLine("-----------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.8 DELETE Object
使用示例

删除<bucket名称>内一个object

private static bool deleteObject()

    {

        // Delete Object

        try

        {

            Console.WriteLine("--- Delete Object: ---");

            ks3Client.deleteObject(bucketName, objKeyName);

            Console.WriteLine("Delete Object completed.");

            Console.WriteLine("---------------------\n");

        }

        catch (Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.9 GET Object
使用示例

下载<bucket名称>下的object

private static bool getObject()

    {

        try

        {

            // GET Object为用户提供了object的下载,用户可以通过控制Range实现分块多线程下载

            Console.WriteLine("--- Download and Store in Memory ---");

            GetObjectRequest getShortContent = new GetObjectRequest(bucketName, objKeyName);

            getShortContent.setRange(0, 24);

            KS3Object ks3Object = ks3Client.getObject(getShortContent);

            StreamReader sr = new StreamReader(ks3Object.getObjectContent());

            Console.WriteLine("Content:\n" + sr.ReadToEnd());

            sr.Close();

            ks3Object.getObjectContent().Close();

            Console.WriteLine("------------------------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        try

        {

            // 直接下载并存储成文件

            Console.WriteLine("--- Download a File ---");

            // I need to get the Content-Length to set the listener.

            ObjectMetadata objectMetadata = ks3Client.getObjectMetadata(bucketName, objKeyName);

            SampleListener downloadListener = new SampleListener(objectMetadata.getContentLength());

            GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, objKeyName, new FileInfo(outFilePath));

            getObjectRequest.setProgressListener(downloadListener);

            KS3Object obj = ks3Client.getObject(getObjectRequest);

            obj.getObjectContent().Close(); // The file was opened in [KS3ObjectResponseHandler], so I close it first.

            Console.WriteLine("Success. See the file downloaded at {0}", outFilePath);

            Console.WriteLine("-----------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.10 GET Object acl
使用示例

获取 <bucket名称>这个bucket下<object key>的权限控制信息

private static bool getObjectACL()

    {

        // Get Object ACL

        try

        {

            Console.WriteLine("--- Get Object ACL: ---");

            AccessControlList acl = ks3Client.getObjectAcl(bucketName ,objKeyName);

            Console.WriteLine("Object Key: " + objKeyName);

            Console.WriteLine(acl.ToString());

            Console.WriteLine("-----------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.11 PUT Object
使用示例

new File("<filePath>")这个文件上传至<bucket名称>这个存储空间下,并命名为<object key>

private static bool putObject()

    {

        try

        {

             //Put Object(upload a short content)

            Console.WriteLine("--- Upload a Short Content: ---");

            String sampleContent = "This is a sample content.(25 characters before, included the 4 spaces)";

            Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(sampleContent));

            PutObjectResult shortContentResult = ks3Client.putObject(bucketName, objKeyName, stream, null);

            Console.WriteLine("Upload Completed. eTag=" + shortContentResult.getETag() + ", MD5=" + shortContentResult.getContentMD5());

            Console.WriteLine("-------------------------------\n");

             //Put Object(upload a file)

            Console.WriteLine("--- Upload a File ---");

            FileInfo file = new FileInfo("E:\\tool\\eclipse.rar");

            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objKeyName, file);

            SampleListener sampleListener = new SampleListener(file.Length);

            putObjectRequest.setProgressListener(sampleListener);

            PutObjectResult putObjectResult = ks3Client.putObject(putObjectRequest);

            Console.WriteLine("Upload Completed. eTag=" + putObjectResult.getETag() + ", MD5=" + putObjectResult.getContentMD5());

            Console.WriteLine("---------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.12 PUT Object acl
使用示例

修改<bucket名称>下object的权限控制

 private static bool setObjectACL()

    {

        // Set Object ACL

        try

        {

            Console.WriteLine("--- Set Object ACL: ---");

            CannedAccessControlList cannedAcl = new CannedAccessControlList(CannedAccessControlList.PUBLICK_READ_WRITE);

            Console.WriteLine("Object Key: " + objKeyName);

            ks3Client.setObjectAcl(bucketName, objKeyName, cannedAcl);

            Console.WriteLine("Success, now the ACL is:\n" + ks3Client.getObjectAcl(bucketName, objKeyName));

            Console.WriteLine("-----------------------\n");

        }

        catch (System.Exception e)

        {

            Console.WriteLine(e.ToString());

            return false;

        }

        return true;

    }
4.13 Multipart Upload
使用示例

注:中途想停止分块上传的话请调用AbortMultipartUpload(bucketname, objectkey, uploadId);

/**

     * 初始化分块上传,服务端会返回一个全局唯一的uploadid

     * **/

    private static InitiateMultipartUploadResult multipartUp()

    {

        InitiateMultipartUploadResult re=ks3Client.initiateMultipartUpload(bucketName, objKeyName);

        Console.WriteLine(re.ToString());

        return re;

    }

    /**

     * 分块上传例子

     * **/

    private static bool uploadPart() {

        string path = @"you file path";//上传文件路径,例如E:\tool\aa.rar

        InitiateMultipartUploadResult result=multipartUp();

        FileInfo file = new FileInfo(path);

        int part = 5 * 1024 * 1024;

        int numBytesToRead = (int)file.Length;

        int i = 0;

        XElement root = new XElement("CompleteMultipartUpload");//初始化一个xml,以备分块上传完成后调用complete方法提交本次上传的文件以通知服务端合并分块

        //开始读取文件

        using (FileStream fs = new FileStream(path, FileMode.Open))

        {

            while (numBytesToRead > 0)

            {

                UploadPartRequest request = new UploadPartRequest(

                        result.getBucket(), result.getKey(), result.getUploadId(),

                        i + 1);

                //每次读取5M文件内容,如果最后一次内容不及5M则按实际大小取值

                int count = Convert.ToInt32((i * part + part) > file.Length ? file.Length - i * part : part);

                byte[] data = new byte[count];

                int n = fs.Read(data, 0, count);

                request.setInputStream(new MemoryStream(data));

                ProgressListener sampleListener = new SampleListener(count);//实例一个更新进度的监听类,实际使用中可自己定义实现

                request.setProgressListener(sampleListener);

                PartETag tag = ks3Client.uploadPart(request);//上传本次分块内容

                Console.WriteLine(tag.ToString());

                if (n == 0)

                    break;

                numBytesToRead -= n;

                XElement partE = new XElement("Part");

                partE.Add(new XElement("PartNumber", i + 1));

                partE.Add(new XElement("ETag", tag.geteTag()));

                root.Add(partE);

                i++;

            }

        }

        //所有分块上传完成后发起complete request,通知服务端合并分块

        CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest(result.getBucket(), result.getKey(), result.getUploadId());

        completeRequest.setContent(new MemoryStream(System.Text.Encoding.Default.GetBytes(root.ToString())));

        CompleteMultipartUploadResult completeResult = ks3Client.completeMultipartUpload(completeRequest);

        return true;

    }

    /**

     * 放弃本次上传

     * **/

    private static bool AbortMultipartUpload(string bucket, string objKey, string uploadId)

    {

        AbortMultipartUploadRequest request = new AbortMultipartUploadRequest(bucket, objKey, uploadId);

        ks3Client.AbortMultipartUpload(request);

        return true;

    }

金山云,开启您的云计算之旅

立即注册