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Java分片上傳

OSS提供的分片上傳(Multipart Upload)功能,將要上傳的較大文件(Object)分成多個分片(Part)來分別上傳,上傳完成后再調用CompleteMultipartUpload接口將這些Part組合成一個Object來達到斷點續傳的效果。

注意事項

  • 本文以本地文件分片上傳為例進行介紹,如果您需要實現網絡流或者數據流分片上傳,請參見數據流分片上傳

  • 本文以華東1(杭州)外網Endpoint為例。如果您希望通過與OSS同地域的其他阿里云產品訪問OSS,請使用內網Endpoint。關于OSS支持的RegionEndpoint的對應關系,請參見OSS訪問域名、數據中心、開放端口

  • 本文以從環境變量讀取訪問憑證為例。如何配置訪問憑證,請參見Java配置訪問憑證

  • 本文以OSS域名新建OSSClient為例。如果您希望通過自定義域名、STS等方式新建OSSClient,請參見新建OSSClient

  • 要分片上傳,您必須有oss:PutObject權限。具體操作,請參見RAM用戶授權自定義的權限策略

分片上傳流程

分片上傳(Multipart Upload)分為以下三個步驟:

  1. 初始化一個分片上傳事件。

    調用ossClient.initiateMultipartUpload方法返回OSS創建的全局唯一的uploadId。

  2. 上傳分片。

    調用ossClient.uploadPart方法上傳分片數據。

    說明
    • 對于同一個uploadId,分片號(PartNumber)標識了該分片在整個文件內的相對位置。如果使用同一個分片號上傳了新的數據,則OSS上該分片已有的數據將會被覆蓋。

    • OSS將收到的分片數據的MD5值放在ETag頭內返回給用戶。

    • OSS計算上傳數據的MD5值,并與SDK計算的MD5值比較,如果不一致則返回InvalidDigest錯誤碼。

  3. 完成分片上傳。

    所有分片上傳完成后,調用ossClient.completeMultipartUpload方法將所有分片合并成完整的文件。

關于分片上傳的說明及適用場景,請參見分片上傳

分片上傳完整示例

以下通過一個完整的示例對分片上傳的流程進行逐步解析:

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.internal.Mimetypes;
import com.aliyun.oss.model.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class Demo {

    public static void main(String[] args) throws Exception {
        // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填寫Bucket名稱,例如examplebucket。
        String bucketName = "examplebucket";
        // 填寫Object完整路徑,例如exampledir/exampleobject.txt。Object完整路徑中不能包含Bucket名稱。
        String objectName = "exampledir/exampleobject.txt";
        // 待上傳本地文件路徑。
        String filePath = "D:\\localpath\\examplefile.txt";
        // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
        String region = "cn-hangzhou";

        // 創建OSSClient實例。
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();
        
        try {
            // 創建InitiateMultipartUploadRequest對象。
            InitiateMultipartUploadRequest request = new InitiateMultipartUploadRequest(bucketName, objectName);

            // 如果需要在初始化分片時設置請求頭,請參考以下示例代碼。
             ObjectMetadata metadata = new ObjectMetadata();
            // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.Standard.toString());
            // 指定該Object的網頁緩存行為。
            // metadata.setCacheControl("no-cache");
            // 指定該Object被下載時的名稱。
            // metadata.setContentDisposition("attachment;filename=oss_MultipartUpload.txt");
            // 指定該Object的內容編碼格式。
            // metadata.setContentEncoding(OSSConstants.DEFAULT_CHARSET_NAME);
            // 指定初始化分片上傳時是否覆蓋同名Object。此處設置為true,表示禁止覆蓋同名Object。
            // metadata.setHeader("x-oss-forbid-overwrite", "true");
            // 指定上傳該Object的每個part時使用的服務器端加密方式。
            // metadata.setHeader(OSSHeaders.OSS_SERVER_SIDE_ENCRYPTION, ObjectMetadata.KMS_SERVER_SIDE_ENCRYPTION);
            // 指定Object的加密算法。如果未指定此選項,表明Object使用AES256加密算法。
            // metadata.setHeader(OSSHeaders.OSS_SERVER_SIDE_DATA_ENCRYPTION, ObjectMetadata.KMS_SERVER_SIDE_ENCRYPTION);
            // 指定KMS托管的用戶主密鑰。
            // metadata.setHeader(OSSHeaders.OSS_SERVER_SIDE_ENCRYPTION_KEY_ID, "9468da86-3509-4f8d-a61e-6eab1eac****");
            // 指定Object的存儲類型。
            // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.Standard);
            // 指定Object的對象標簽,可同時設置多個標簽。
            // metadata.setHeader(OSSHeaders.OSS_TAGGING, "a:1");
            // request.setObjectMetadata(metadata);

            // 根據文件自動設置ContentType。如果不設置,ContentType默認值為application/oct-srream。
            if (metadata.getContentType() == null) {
                metadata.setContentType(Mimetypes.getInstance().getMimetype(new File(filePath), objectName));
            }

            // 初始化分片。
            InitiateMultipartUploadResult upresult = ossClient.initiateMultipartUpload(request);
            // 返回uploadId。
            String uploadId = upresult.getUploadId();
            // 根據uploadId執行取消分片上傳事件或者列舉已上傳分片的操作。
            // 如果您需要根據uploadId執行取消分片上傳事件的操作,您需要在調用InitiateMultipartUpload完成初始化分片之后獲取uploadId。 
            // 如果您需要根據uploadId執行列舉已上傳分片的操作,您需要在調用InitiateMultipartUpload完成初始化分片之后,且在調用CompleteMultipartUpload完成分片上傳之前獲取uploadId。
            // System.out.println(uploadId);

            // partETags是PartETag的集合。PartETag由分片的ETag和分片號組成。
            List<PartETag> partETags =  new ArrayList<PartETag>();
            // 每個分片的大小,用于計算文件有多少個分片。單位為字節。
            final long partSize = 1 * 1024 * 1024L;   //1 MB。

            // 根據上傳的數據大小計算分片數。以本地文件為例,說明如何通過File.length()獲取上傳數據的大小。
            final File sampleFile = new File(filePath);
            long fileLength = sampleFile.length();
            int partCount = (int) (fileLength / partSize);
            if (fileLength % partSize != 0) {
                partCount++;
            }
            // 遍歷分片上傳。
            for (int i = 0; i < partCount; i++) {
                long startPos = i * partSize;
                long curPartSize = (i + 1 == partCount) ? (fileLength - startPos) : partSize;
                UploadPartRequest uploadPartRequest = new UploadPartRequest();
                uploadPartRequest.setBucketName(bucketName);
                uploadPartRequest.setKey(objectName);
                uploadPartRequest.setUploadId(uploadId);
                // 設置上傳的分片流。
                // 以本地文件為例說明如何創建FIleInputstream,并通過InputStream.skip()方法跳過指定數據。
                InputStream instream = new FileInputStream(sampleFile);
                instream.skip(startPos);
                uploadPartRequest.setInputStream(instream);
                // 設置分片大小。除了最后一個分片沒有大小限制,其他的分片最小為100 KB。
                uploadPartRequest.setPartSize(curPartSize);
                // 設置分片號。每一個上傳的分片都有一個分片號,取值范圍是1~10000,如果超出此范圍,OSS將返回InvalidArgument錯誤碼。
                uploadPartRequest.setPartNumber( i + 1);
                // 每個分片不需要按順序上傳,甚至可以在不同客戶端上傳,OSS會按照分片號排序組成完整的文件。
                UploadPartResult uploadPartResult = ossClient.uploadPart(uploadPartRequest);
                // 每次上傳分片之后,OSS的返回結果包含PartETag。PartETag將被保存在partETags中。
                partETags.add(uploadPartResult.getPartETag());
            }


            // 創建CompleteMultipartUploadRequest對象。
            // 在執行完成分片上傳操作時,需要提供所有有效的partETags。OSS收到提交的partETags后,會逐一驗證每個分片的有效性。當所有的數據分片驗證通過后,OSS將把這些分片組合成一個完整的文件。
            CompleteMultipartUploadRequest completeMultipartUploadRequest =
                    new CompleteMultipartUploadRequest(bucketName, objectName, uploadId, partETags);

            // 如果需要在完成分片上傳的同時設置文件訪問權限,請參考以下示例代碼。
            // completeMultipartUploadRequest.setObjectACL(CannedAccessControlList.Private);
            // 指定是否列舉當前UploadId已上傳的所有Part。僅在Java SDK為3.14.0及以上版本時,支持通過服務端List分片數據來合并完整文件時,將CompleteMultipartUploadRequest中的partETags設置為null。
            // Map<String, String> headers = new HashMap<String, String>();
            // 如果指定了x-oss-complete-all:yes,則OSS會列舉當前UploadId已上傳的所有Part,然后按照PartNumber的序號排序并執行CompleteMultipartUpload操作。
            // 如果指定了x-oss-complete-all:yes,則不允許繼續指定body,否則報錯。
            // headers.put("x-oss-complete-all","yes");
            // completeMultipartUploadRequest.setHeaders(headers);

            // 完成分片上傳。
            CompleteMultipartUploadResult completeMultipartUploadResult = ossClient.completeMultipartUpload(completeMultipartUploadRequest);
            System.out.println(completeMultipartUploadResult.getETag());
        } 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();
            }
        }
    }
}

取消分片上傳事件

您可以調用ossClient.abortMultipartUpload方法來取消分片上傳事件。當一個分片上傳事件被取消后,無法再使用該uploadId進行任何操作,已上傳的分片數據會被刪除。

以下代碼用于取消分片上傳事件。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填寫Bucket名稱,例如examplebucket。
        String bucketName = "examplebucket";
        // 填寫Object完整路徑,例如exampledir/exampleobject.txt。Object完整路徑中不能包含Bucket名稱。
        String objectName = "exampledir/exampleobject.txt";
        // 填寫uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId來源于調用InitiateMultipartUpload完成初始化分片之后的返回結果。
        String uploadId = "0004B999EF518A1FE585B0C9360D****";
        // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
        String region = "cn-hangzhou";

        // 創建OSSClient實例。
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();
        
        try {
            // 取消分片上傳。
            AbortMultipartUploadRequest abortMultipartUploadRequest =
                    new AbortMultipartUploadRequest(bucketName, objectName, uploadId);
            ossClient.abortMultipartUpload(abortMultipartUploadRequest);
        } 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();
            }
        }
    }
}

列舉已上傳的分片

調用ossClient.listParts方法列舉出指定uploadId下所有已經上傳成功的分片。

  • 簡單列舉已上傳的分片

    以下代碼用于簡單列舉已上傳的分片:

    import com.aliyun.oss.ClientException;
    import com.aliyun.oss.OSS;
    import com.aliyun.oss.common.auth.*;
    import com.aliyun.oss.OSSClientBuilder;
    import com.aliyun.oss.OSSException;
    import com.aliyun.oss.model.*;
    
    public class Demo {
    
        public static void main(String[] args) throws Exception {
            // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填寫Bucket名稱,例如examplebucket。
            String bucketName = "examplebucket";
            // 填寫Object完整路徑,例如exampledir/exampleobject.txt。Object完整路徑中不能包含Bucket名稱。
            String objectName = "exampledir/exampleobject.txt";
            // 填寫uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId來源于調用InitiateMultipartUpload完成初始化分片之后,且在調用CompleteMultipartUpload完成分片上傳之前的返回結果。
            String uploadId = "0004B999EF518A1FE585B0C9360D****";
            // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 創建OSSClient實例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列舉已上傳的分片。
                ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
                // 設置uploadId。
                //listPartsRequest.setUploadId(uploadId);
                // 設置分頁時每一頁中分片數量為100個。默認列舉1000個分片。
                listPartsRequest.setMaxParts(100);
                // 指定List的起始位置。只有分片號大于此參數值的分片會被列舉。
                listPartsRequest.setPartNumberMarker(2);
                PartListing partListing = ossClient.listParts(listPartsRequest);
    
                for (PartSummary part : partListing.getParts()) {
                    // 獲取分片號。
                    System.out.println(part.getPartNumber());
                    // 獲取分片數據大小。
                    System.out.println(part.getSize());
                    // 獲取分片的ETag。
                    System.out.println(part.getETag());
                    // 獲取分片的最后修改時間。
                    System.out.println(part.getLastModified());
                }
            } 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();
                }
            }
        }
    }
  • 列舉所有已上傳的分片

    默認情況下,listParts只能一次列舉1000個分片。當分片數量大于1000時,請使用以下代碼列舉所有已上傳的分片。

    import com.aliyun.oss.ClientException;
    import com.aliyun.oss.OSS;
    import com.aliyun.oss.common.auth.*;
    import com.aliyun.oss.OSSClientBuilder;
    import com.aliyun.oss.OSSException;
    import com.aliyun.oss.model.*;
    
    public class Demo {
    
        public static void main(String[] args) throws Exception {
            // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填寫Bucket名稱,例如examplebucket。
            String bucketName = "examplebucket";
            // 填寫Object完整路徑,例如exampledir/exampleobject.txt。Object完整路徑中不能包含Bucket名稱。
            String objectName = "exampledir/exampleobject.txt";
            // 填寫uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId來源于調用InitiateMultipartUpload完成初始化分片之后,且在調用CompleteMultipartUpload完成分片上傳之前的返回結果。
            String uploadId = "0004B999EF518A1FE585B0C9360D****";
            // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 創建OSSClient實例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列舉所有已上傳的分片。
                PartListing partListing;
                ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
    
                do {
                    partListing = ossClient.listParts(listPartsRequest);
    
                    for (PartSummary part : partListing.getParts()) {
                        // 獲取分片號。
                        System.out.println(part.getPartNumber());
                        // 獲取分片數據大小。
                        System.out.println(part.getSize());
                        // 獲取分片的ETag。
                        System.out.println(part.getETag());
                        // 獲取分片的最后修改時間。
                        System.out.println(part.getLastModified());
                    }
                    // 指定List的起始位置,只有分片號大于此參數值的分片會被列出。
                    listPartsRequest.setPartNumberMarker(partListing.getNextPartNumberMarker());
                } while (partListing.isTruncated());
            } 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();
                }
            }
        }
    }
  • 分頁列舉所有已上傳的分片

    以下代碼用于指定每頁分片的數量、分頁列舉所有分片。

    import com.aliyun.oss.ClientException;
    import com.aliyun.oss.OSS;
    import com.aliyun.oss.common.auth.*;
    import com.aliyun.oss.OSSClientBuilder;
    import com.aliyun.oss.OSSException;
    import com.aliyun.oss.model.*;
    
    public class Demo {
    
        public static void main(String[] args) throws Exception {
            // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填寫Bucket名稱,例如examplebucket。
            String bucketName = "examplebucket";
            // 填寫Object完整路徑,例如exampledir/exampleobject.txt。Object完整路徑中不能包含Bucket名稱。
            String objectName = "exampledir/exampleobject.txt";
            // 填寫uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId來源于調用InitiateMultipartUpload完成初始化分片之后,且在調用CompleteMultipartUpload完成分片上傳之前的返回結果。
            String uploadId = "0004B999EF518A1FE585B0C9360D****";
            // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 創建OSSClient實例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 分頁列舉已上傳的分片。
                PartListing partListing;
                ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
                // 設置分頁列舉時,每頁列舉100個分片。
                listPartsRequest.setMaxParts(100);
    
                do {
                    partListing = ossClient.listParts(listPartsRequest);
    
                    for (PartSummary part : partListing.getParts()) {
                        // 獲取分片號。
                        System.out.println(part.getPartNumber());
                        // 獲取分片數據大小。
                        System.out.println(part.getSize());
                        // 獲取分片的ETag。
                        System.out.println(part.getETag());
                        // 獲取分片的最后修改時間。
                        System.out.println(part.getLastModified());
                    }
    
                    listPartsRequest.setPartNumberMarker(partListing.getNextPartNumberMarker());
    
                } while (partListing.isTruncated());
            } 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();
                }
            }
        }
    }                    

列舉分片上傳事件

調用ossClient.listMultipartUploads方法列舉出所有執行中的分片上傳事件,即已初始化但尚未完成或已取消的分片上傳事件。可設置的參數請參見下表。

參數

作用

設置方法

prefix

限定返回的文件名稱必須以指定的prefix作為前綴。注意使用prefix查詢時,返回的文件名稱中仍會包含prefix。

ListMultipartUploadsRequest.setPrefix(String prefix)

delimiter

用于對文件名稱進行分組的一個字符。所有名稱包含指定的前綴且第一次出現delimiter字符之間的文件作為一組元素。

ListMultipartUploadsRequest.setDelimiter(String delimiter)

maxUploads

限定此次返回分片上傳事件的最大個數,默認值和最大值均為1000。

ListMultipartUploadsRequest.setMaxUploads(Integer maxUploads)

keyMarker

所有文件名稱的字典序大于keyMarker參數值的分片上傳事件。與uploadIdMarker參數一同使用,用于指定返回結果的起始位置。

ListMultipartUploadsRequest.setKeyMarker(String keyMarker)

uploadIdMarker

keyMarker參數一同使用,用于指定返回結果的起始位置。 如果未設置keyMarker參數,則此參數無效。如果設置了keyMarker參數,則查詢結果中包含:

  • 文件名稱的字典序大于keyMarker參數值的所有文件。

  • 文件名稱等于keyMarker參數值且uploadIduploadIdMarker參數值大的所有分片上傳事件。

ListMultipartUploadsRequest.setUploadIdMarker(String uploadIdMarker)

  • 簡單列舉分片上傳事件

    以下代碼用于列舉分片上傳事件。

    import com.aliyun.oss.ClientException;
    import com.aliyun.oss.OSS;
    import com.aliyun.oss.common.auth.*;
    import com.aliyun.oss.OSSClientBuilder;
    import com.aliyun.oss.OSSException;
    import com.aliyun.oss.model.*;
    
    public class Demo {
    
        public static void main(String[] args) throws Exception {
            // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填寫Bucket名稱,例如examplebucket。
            String bucketName = "examplebucket";
            // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 創建OSSClient實例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列舉分片上傳事件。默認列舉1000個分片。
                ListMultipartUploadsRequest listMultipartUploadsRequest = new ListMultipartUploadsRequest(bucketName);
                MultipartUploadListing multipartUploadListing = ossClient.listMultipartUploads(listMultipartUploadsRequest);
    
                for (MultipartUpload multipartUpload : multipartUploadListing.getMultipartUploads()) {
                    // 獲取uploadId。
                    System.out.println(multipartUpload.getUploadId());
                    // 獲取Key。
                    System.out.println(multipartUpload.getKey());
                    // 獲取分片上傳的初始化時間。
                    System.out.println(multipartUpload.getInitiated());
                }
            } 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();
                }
            }
        }
    }

    返回結果中isTruncatedtrue,返回nextKeyMarkernextUploadIdMarker作為下次讀取的起點。如果無法一次性獲取所有的上傳事件,可以采用分頁列舉的方式。

  • 列舉全部分片上傳事件

    默認情況下,listMultipartUploads只能一次列舉1000個分片。當分片數量大于1000時,請使用以下代碼列舉全部分片上傳事件。

    import com.aliyun.oss.ClientException;
    import com.aliyun.oss.OSS;
    import com.aliyun.oss.common.auth.*;
    import com.aliyun.oss.OSSClientBuilder;
    import com.aliyun.oss.OSSException;
    import com.aliyun.oss.model.*;
    
    public class Demo {
    
        public static void main(String[] args) throws Exception {
            // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填寫Bucket名稱,例如examplebucket。
            String bucketName = "examplebucket";
            // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 創建OSSClient實例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列舉分片上傳事件。
                MultipartUploadListing multipartUploadListing;
                ListMultipartUploadsRequest listMultipartUploadsRequest = new ListMultipartUploadsRequest(bucketName);
    
                do {
                    multipartUploadListing = ossClient.listMultipartUploads(listMultipartUploadsRequest);
    
                    for (MultipartUpload multipartUpload : multipartUploadListing.getMultipartUploads()) {
                        // 獲取uploadId。
                        System.out.println(multipartUpload.getUploadId());
                        // 獲取文件名稱。
                        System.out.println(multipartUpload.getKey());
                        // 獲取分片上傳的初始化時間。
                        System.out.println(multipartUpload.getInitiated());
                    }
    
                    listMultipartUploadsRequest.setKeyMarker(multipartUploadListing.getNextKeyMarker());
    
                    listMultipartUploadsRequest.setUploadIdMarker(multipartUploadListing.getNextUploadIdMarker());
                } while (multipartUploadListing.isTruncated());
            } 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();
                }
            }
        }
    }
  • 分頁列舉全部上傳事件

    以下代碼用于分頁列舉所有上傳事件。

    import com.aliyun.oss.ClientException;
    import com.aliyun.oss.OSS;
    import com.aliyun.oss.common.auth.*;
    import com.aliyun.oss.OSSClientBuilder;
    import com.aliyun.oss.OSSException;
    import com.aliyun.oss.model.*;
    
    public class Demo {
    
        public static void main(String[] args) throws Exception {
            // Endpoint以華東1(杭州)為例,其它Region請按實際情況填寫。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填寫Bucket名稱,例如examplebucket。
            String bucketName = "examplebucket";
            // 填寫Bucket所在地域。以華東1(杭州)為例,Region填寫為cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 創建OSSClient實例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列舉分片上傳事件。
                MultipartUploadListing multipartUploadListing;
                ListMultipartUploadsRequest listMultipartUploadsRequest = new ListMultipartUploadsRequest(bucketName);
                // 設置每頁列舉的分片上傳事件個數。
                listMultipartUploadsRequest.setMaxUploads(50);
    
                do {
                    multipartUploadListing = ossClient.listMultipartUploads(listMultipartUploadsRequest);
    
                    for (MultipartUpload multipartUpload : multipartUploadListing.getMultipartUploads()) {
                        // 獲取uploadId。
                        System.out.println(multipartUpload.getUploadId());
                        // 獲取Key。
                        System.out.println(multipartUpload.getKey());
                        // 獲取分片上傳的初始化時間。
                        System.out.println(multipartUpload.getInitiated());
                    }
    
                    listMultipartUploadsRequest.setKeyMarker(multipartUploadListing.getNextKeyMarker());
                    listMultipartUploadsRequest.setUploadIdMarker(multipartUploadListing.getNextUploadIdMarker());
    
                } while (multipartUploadListing.isTruncated());
            } 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();
                }
            }
        }
    }

相關文檔

  • 關于分片上傳的完整示例代碼,請參見GitHub示例

  • 分片上傳的完整實現涉及三個API接口,詳情如下:

  • 關于取消分片上傳事件的API接口說明,請參見AbortMultipartUpload

  • 關于列舉已上傳分片的API接口說明,請參見ListParts

  • 關于列舉所有執行中的分片上傳事件(即已初始化但尚未完成或已取消的分片上傳事件)的API接口說明,請參見ListMultipartUploads