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文档中心 对象存储(KS3) SDK C#

C#

最近更新时间：2023-01-11 10:41:05

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

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：


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

String accessKey = "YOUR ACCESS KEY";
String secretKey = "YOUR SECRET KEY";
String bucketName = "YOUR BUCKET NAME";
String endPoint = "ks3-cn-beijing.ksyuncs.com"; //此处以北京region为例
ks3Client = new KS3Client(accessKey, secretKey);
ks3Client.setEndpoint(endPoint);

3.3 常用术语介绍

Object（对象，文件）

在KS3中，用户操作的基本数据单元是Object。单个Object允许存储0~48.8TB的数据。 Object 包含key和data。其中，key是Object的名字；data是Object 的数据。key为UTF-8编码，且编码后的长度不得超过1024个字符。

Key（文件名）

即Object的名字，key为UTF-8编码，且编码后的长度不得超过1024个字符。Key中可以带有斜杠，当Key中带有斜杠的时候，将会自动在控制台里组织成目录结构。

其他术语请参考概念与术语

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()
{
    // 获取 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()
{
    // 为bucket设置公共读写权限
    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()
{
    //获取 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

将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)
        //以流方式上传文件到KS3，Content-Type 默认为 application/octet-stream
        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)
        //以文件方式上传到KS3时，Content-Type 会默认匹配上传文件的后缀名
        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()
{
    // 设置Object ACL为公共读写
    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
/**
     * 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;
    }
/**
    * 多线程分块上传例子开始
    * **/
    static List<ManualResetEvent> manualEvents = new List<ManualResetEvent>();
    static List<Param> paras = new List<Param>();

    private static bool uploadPartMultithread()
    {
        string path = inFilePath;//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));

                ManualResetEvent mre = new ManualResetEvent(false);
                manualEvents.Add(mre);

                Param pra = new Param();
                pra.mrEvent = mre;
                pra.praNum = i + 1;
                pra.request = request;
                paras.Add(pra);

                ThreadPool.QueueUserWorkItem(new WaitCallback(uploadPartTask), pra);
                if (n == 0)
                    break;
                numBytesToRead -= n;
                i++;
            }
        }

        WaitHandle.WaitAll(manualEvents.ToArray());

        for (int j = 0; j < paras.Count; j++)
        {
            XElement partE = new XElement("Part");
            partE.Add(new XElement("PartNumber", paras[j].praNum));
            partE.Add(new XElement("ETag", paras[j].etag));
            Console.WriteLine("==" + paras[j].praNum + ", etag=" + paras[j].etag);
            root.Add(partE);
        }

        //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;
    }

    private static void uploadPartTask(Object obj) {
        Param pra = (Param)obj;
        UploadPartRequest request = pra.request;
        PartETag tag = ks3Client.uploadPart(request);//上传本次分块内容
        if (tag.geteTag() != null) {
            pra.etag = tag.geteTag();                
            pra.mrEvent.Set();
            Console.WriteLine(tag.ToString());
        }
    }

    public class Param
    {
        public ManualResetEvent mrEvent;
        public UploadPartRequest request;
        public int praNum;
        public string etag;
    }
    /**
    * 多线程分块上传例子结束
    * */

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

4.14 生成带签名的URL

使用示例
private static void getObjUrl() {
DateTime date = DateTime.Now;
date=date.AddMinutes(5);//指定签名有效期
String url = ks3Client.generatePresignedUrl("YourBucketName", "YourKey", date);
Console.WriteLine("url:"+url);
}
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