Java分片上传

OSS提供的分片上传(Multipart Upload)功能,将要上传的较大文件(Object)分成多个分片(Part)来分别上传,上传完成后再调用CompleteMultipartUpload接口将这些Part组合成一个Object来达到断点续传的效果。

注意事项

  • 本文以本地文件分片上传为例进行介绍,如果您需要实现网络流或者数据流分片上传,请参见数据流分片上传

  • 本文以华东1(杭州)外网Endpoint为例。如果您希望通过与OSS同地域的其他阿里云产品访问OSS,请使用内网Endpoint。关于OSS支持的RegionEndpoint的对应关系,请参见OSS访问域名、数据中心、开放端口

  • 本文以从环境变量读取访问凭证为例。如何配置访问凭证,请参见Java配置访问凭证

  • 本文以OSS域名新建OSSClient为例。如果您希望通过自定义域名、STS等方式新建OSSClient,请参见新建OSSClient

  • 要分片上传,您必须有oss:PutObject权限。具体操作,请参见RAM用户授权自定义的权限策略

分片上传流程

分片上传(Multipart Upload)分为以下三个步骤:

  1. 初始化一个分片上传事件。

    调用ossClient.initiateMultipartUpload方法返回OSS创建的全局唯一的uploadId。

  2. 上传分片。

    调用ossClient.uploadPart方法上传分片数据。

    说明
    • 对于同一个uploadId,分片号(PartNumber)标识了该分片在整个文件内的相对位置。如果使用同一个分片号上传了新的数据,则OSS上该分片已有的数据将会被覆盖。

    • OSS将收到的分片数据的MD5值放在ETag头内返回给用户。

    • OSS计算上传数据的MD5值,并与SDK计算的MD5值比较,如果不一致则返回InvalidDigest错误码。

  3. 完成分片上传。

    所有分片上传完成后,调用ossClient.completeMultipartUpload方法将所有分片合并成完整的文件。

关于分片上传的说明及适用场景,请参见分片上传

分片上传完整示例

以下通过一个完整的示例对分片上传的流程进行逐步解析:

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以华东1(杭州)为例,其它Region请按实际情况填写。
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
        String objectName = "exampledir/exampleobject.txt";
        // 待上传本地文件路径。
        String filePath = "D:\\localpath\\examplefile.txt";
        // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
        String region = "cn-hangzhou";

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

            // 如果需要在初始化分片时设置请求头,请参考以下示例代码。
             ObjectMetadata metadata = new ObjectMetadata();
            // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.Standard.toString());
            // 指定该Object的网页缓存行为。
            // metadata.setCacheControl("no-cache");
            // 指定该Object被下载时的名称。
            // metadata.setContentDisposition("attachment;filename=oss_MultipartUpload.txt");
            // 指定该Object的内容编码格式。
            // metadata.setContentEncoding(OSSConstants.DEFAULT_CHARSET_NAME);
            // 指定初始化分片上传时是否覆盖同名Object。此处设置为true,表示禁止覆盖同名Object。
            // metadata.setHeader("x-oss-forbid-overwrite", "true");
            // 指定上传该Object的每个part时使用的服务器端加密方式。
            // metadata.setHeader(OSSHeaders.OSS_SERVER_SIDE_ENCRYPTION, ObjectMetadata.KMS_SERVER_SIDE_ENCRYPTION);
            // 指定Object的加密算法。如果未指定此选项,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托管的用户主密钥。
            // metadata.setHeader(OSSHeaders.OSS_SERVER_SIDE_ENCRYPTION_KEY_ID, "9468da86-3509-4f8d-a61e-6eab1eac****");
            // 指定Object的存储类型。
            // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.Standard);
            // 指定Object的对象标签,可同时设置多个标签。
            // metadata.setHeader(OSSHeaders.OSS_TAGGING, "a:1");
            // request.setObjectMetadata(metadata);

            // 根据文件自动设置ContentType。如果不设置,ContentType默认值为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();
            // 根据uploadId执行取消分片上传事件或者列举已上传分片的操作。
            // 如果您需要根据uploadId执行取消分片上传事件的操作,您需要在调用InitiateMultipartUpload完成初始化分片之后获取uploadId。 
            // 如果您需要根据uploadId执行列举已上传分片的操作,您需要在调用InitiateMultipartUpload完成初始化分片之后,且在调用CompleteMultipartUpload完成分片上传之前获取uploadId。
            // System.out.println(uploadId);

            // partETags是PartETag的集合。PartETag由分片的ETag和分片号组成。
            List<PartETag> partETags =  new ArrayList<PartETag>();
            // 每个分片的大小,用于计算文件有多少个分片。单位为字节。
            final long partSize = 1 * 1024 * 1024L;   //1 MB。

            // 根据上传的数据大小计算分片数。以本地文件为例,说明如何通过File.length()获取上传数据的大小。
            final File sampleFile = new File(filePath);
            long fileLength = sampleFile.length();
            int partCount = (int) (fileLength / partSize);
            if (fileLength % partSize != 0) {
                partCount++;
            }
            // 遍历分片上传。
            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);
                // 设置上传的分片流。
                // 以本地文件为例说明如何创建FIleInputstream,并通过InputStream.skip()方法跳过指定数据。
                InputStream instream = new FileInputStream(sampleFile);
                instream.skip(startPos);
                uploadPartRequest.setInputStream(instream);
                // 设置分片大小。除了最后一个分片没有大小限制,其他的分片最小为100 KB。
                uploadPartRequest.setPartSize(curPartSize);
                // 设置分片号。每一个上传的分片都有一个分片号,取值范围是1~10000,如果超出此范围,OSS将返回InvalidArgument错误码。
                uploadPartRequest.setPartNumber( i + 1);
                // 每个分片不需要按顺序上传,甚至可以在不同客户端上传,OSS会按照分片号排序组成完整的文件。
                UploadPartResult uploadPartResult = ossClient.uploadPart(uploadPartRequest);
                // 每次上传分片之后,OSS的返回结果包含PartETag。PartETag将被保存在partETags中。
                partETags.add(uploadPartResult.getPartETag());
            }


            // 创建CompleteMultipartUploadRequest对象。
            // 在执行完成分片上传操作时,需要提供所有有效的partETags。OSS收到提交的partETags后,会逐一验证每个分片的有效性。当所有的数据分片验证通过后,OSS将把这些分片组合成一个完整的文件。
            CompleteMultipartUploadRequest completeMultipartUploadRequest =
                    new CompleteMultipartUploadRequest(bucketName, objectName, uploadId, partETags);

            // 如果需要在完成分片上传的同时设置文件访问权限,请参考以下示例代码。
            // completeMultipartUploadRequest.setObjectACL(CannedAccessControlList.Private);
            // 指定是否列举当前UploadId已上传的所有Part。仅在Java SDK为3.14.0及以上版本时,支持通过服务端List分片数据来合并完整文件时,将CompleteMultipartUploadRequest中的partETags设置为null。
            // Map<String, String> headers = new HashMap<String, String>();
            // 如果指定了x-oss-complete-all:yes,则OSS会列举当前UploadId已上传的所有Part,然后按照PartNumber的序号排序并执行CompleteMultipartUpload操作。
            // 如果指定了x-oss-complete-all:yes,则不允许继续指定body,否则报错。
            // headers.put("x-oss-complete-all","yes");
            // completeMultipartUploadRequest.setHeaders(headers);

            // 完成分片上传。
            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();
            }
        }
    }
}

取消分片上传事件

您可以调用ossClient.abortMultipartUpload方法来取消分片上传事件。当一个分片上传事件被取消后,无法再使用该uploadId进行任何操作,已上传的分片数据会被删除。

以下代码用于取消分片上传事件。

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以华东1(杭州)为例,其它Region请按实际情况填写。
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
        String objectName = "exampledir/exampleobject.txt";
        // 填写uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId来源于调用InitiateMultipartUpload完成初始化分片之后的返回结果。
        String uploadId = "0004B999EF518A1FE585B0C9360D****";
        // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
        String region = "cn-hangzhou";

        // 创建OSSClient实例。
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();
        
        try {
            // 取消分片上传。
            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();
            }
        }
    }
}

列举已上传的分片

调用ossClient.listParts方法列举出指定uploadId下所有已经上传成功的分片。

  • 简单列举已上传的分片

    以下代码用于简单列举已上传的分片:

    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以华东1(杭州)为例,其它Region请按实际情况填写。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称,例如examplebucket。
            String bucketName = "examplebucket";
            // 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
            String objectName = "exampledir/exampleobject.txt";
            // 填写uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId来源于调用InitiateMultipartUpload完成初始化分片之后,且在调用CompleteMultipartUpload完成分片上传之前的返回结果。
            String uploadId = "0004B999EF518A1FE585B0C9360D****";
            // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 创建OSSClient实例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列举已上传的分片。
                ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
                // 设置uploadId。
                //listPartsRequest.setUploadId(uploadId);
                // 设置分页时每一页中分片数量为100个。默认列举1000个分片。
                listPartsRequest.setMaxParts(100);
                // 指定List的起始位置。只有分片号大于此参数值的分片会被列举。
                listPartsRequest.setPartNumberMarker(2);
                PartListing partListing = ossClient.listParts(listPartsRequest);
    
                for (PartSummary part : partListing.getParts()) {
                    // 获取分片号。
                    System.out.println(part.getPartNumber());
                    // 获取分片数据大小。
                    System.out.println(part.getSize());
                    // 获取分片的ETag。
                    System.out.println(part.getETag());
                    // 获取分片的最后修改时间。
                    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();
                }
            }
        }
    }
  • 列举所有已上传的分片

    默认情况下,listParts只能一次列举1000个分片。当分片数量大于1000时,请使用以下代码列举所有已上传的分片。

    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以华东1(杭州)为例,其它Region请按实际情况填写。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称,例如examplebucket。
            String bucketName = "examplebucket";
            // 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
            String objectName = "exampledir/exampleobject.txt";
            // 填写uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId来源于调用InitiateMultipartUpload完成初始化分片之后,且在调用CompleteMultipartUpload完成分片上传之前的返回结果。
            String uploadId = "0004B999EF518A1FE585B0C9360D****";
            // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 创建OSSClient实例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列举所有已上传的分片。
                PartListing partListing;
                ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
    
                do {
                    partListing = ossClient.listParts(listPartsRequest);
    
                    for (PartSummary part : partListing.getParts()) {
                        // 获取分片号。
                        System.out.println(part.getPartNumber());
                        // 获取分片数据大小。
                        System.out.println(part.getSize());
                        // 获取分片的ETag。
                        System.out.println(part.getETag());
                        // 获取分片的最后修改时间。
                        System.out.println(part.getLastModified());
                    }
                    // 指定List的起始位置,只有分片号大于此参数值的分片会被列出。
                    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();
                }
            }
        }
    }
  • 分页列举所有已上传的分片

    以下代码用于指定每页分片的数量、分页列举所有分片。

    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以华东1(杭州)为例,其它Region请按实际情况填写。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称,例如examplebucket。
            String bucketName = "examplebucket";
            // 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
            String objectName = "exampledir/exampleobject.txt";
            // 填写uploadId,例如0004B999EF518A1FE585B0C9360D****。uploadId来源于调用InitiateMultipartUpload完成初始化分片之后,且在调用CompleteMultipartUpload完成分片上传之前的返回结果。
            String uploadId = "0004B999EF518A1FE585B0C9360D****";
            // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 创建OSSClient实例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 分页列举已上传的分片。
                PartListing partListing;
                ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
                // 设置分页列举时,每页列举100个分片。
                listPartsRequest.setMaxParts(100);
    
                do {
                    partListing = ossClient.listParts(listPartsRequest);
    
                    for (PartSummary part : partListing.getParts()) {
                        // 获取分片号。
                        System.out.println(part.getPartNumber());
                        // 获取分片数据大小。
                        System.out.println(part.getSize());
                        // 获取分片的ETag。
                        System.out.println(part.getETag());
                        // 获取分片的最后修改时间。
                        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();
                }
            }
        }
    }                    

列举分片上传事件

调用ossClient.listMultipartUploads方法列举出所有执行中的分片上传事件,即已初始化但尚未完成或已取消的分片上传事件。可设置的参数请参见下表。

参数

作用

设置方法

prefix

限定返回的文件名称必须以指定的prefix作为前缀。注意使用prefix查询时,返回的文件名称中仍会包含prefix。

ListMultipartUploadsRequest.setPrefix(String prefix)

delimiter

用于对文件名称进行分组的一个字符。所有名称包含指定的前缀且第一次出现delimiter字符之间的文件作为一组元素。

ListMultipartUploadsRequest.setDelimiter(String delimiter)

maxUploads

限定此次返回分片上传事件的最大个数,默认值和最大值均为1000。

ListMultipartUploadsRequest.setMaxUploads(Integer maxUploads)

keyMarker

所有文件名称的字典序大于keyMarker参数值的分片上传事件。与uploadIdMarker参数一同使用,用于指定返回结果的起始位置。

ListMultipartUploadsRequest.setKeyMarker(String keyMarker)

uploadIdMarker

keyMarker参数一同使用,用于指定返回结果的起始位置。 如果未设置keyMarker参数,则此参数无效。如果设置了keyMarker参数,则查询结果中包含:

  • 文件名称的字典序大于keyMarker参数值的所有文件。

  • 文件名称等于keyMarker参数值且uploadIduploadIdMarker参数值大的所有分片上传事件。

ListMultipartUploadsRequest.setUploadIdMarker(String uploadIdMarker)

  • 简单列举分片上传事件

    以下代码用于列举分片上传事件。

    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以华东1(杭州)为例,其它Region请按实际情况填写。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称,例如examplebucket。
            String bucketName = "examplebucket";
            // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 创建OSSClient实例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列举分片上传事件。默认列举1000个分片。
                ListMultipartUploadsRequest listMultipartUploadsRequest = new ListMultipartUploadsRequest(bucketName);
                MultipartUploadListing multipartUploadListing = ossClient.listMultipartUploads(listMultipartUploadsRequest);
    
                for (MultipartUpload multipartUpload : multipartUploadListing.getMultipartUploads()) {
                    // 获取uploadId。
                    System.out.println(multipartUpload.getUploadId());
                    // 获取Key。
                    System.out.println(multipartUpload.getKey());
                    // 获取分片上传的初始化时间。
                    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();
                }
            }
        }
    }

    返回结果中isTruncatedtrue,返回nextKeyMarkernextUploadIdMarker作为下次读取的起点。如果无法一次性获取所有的上传事件,可以采用分页列举的方式。

  • 列举全部分片上传事件

    默认情况下,listMultipartUploads只能一次列举1000个分片。当分片数量大于1000时,请使用以下代码列举全部分片上传事件。

    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以华东1(杭州)为例,其它Region请按实际情况填写。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称,例如examplebucket。
            String bucketName = "examplebucket";
            // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 创建OSSClient实例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列举分片上传事件。
                MultipartUploadListing multipartUploadListing;
                ListMultipartUploadsRequest listMultipartUploadsRequest = new ListMultipartUploadsRequest(bucketName);
    
                do {
                    multipartUploadListing = ossClient.listMultipartUploads(listMultipartUploadsRequest);
    
                    for (MultipartUpload multipartUpload : multipartUploadListing.getMultipartUploads()) {
                        // 获取uploadId。
                        System.out.println(multipartUpload.getUploadId());
                        // 获取文件名称。
                        System.out.println(multipartUpload.getKey());
                        // 获取分片上传的初始化时间。
                        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();
                }
            }
        }
    }
  • 分页列举全部上传事件

    以下代码用于分页列举所有上传事件。

    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以华东1(杭州)为例,其它Region请按实际情况填写。
            String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
            // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
            EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
            // 填写Bucket名称,例如examplebucket。
            String bucketName = "examplebucket";
            // 填写Bucket所在地域。以华东1(杭州)为例,Region填写为cn-hangzhou。
            String region = "cn-hangzhou";
    
            // 创建OSSClient实例。
            ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
            clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
            OSS ossClient = OSSClientBuilder.create()
            .endpoint(endpoint)
            .credentialsProvider(credentialsProvider)
            .clientConfiguration(clientBuilderConfiguration)
            .region(region)               
            .build();
            
            try {
                // 列举分片上传事件。
                MultipartUploadListing multipartUploadListing;
                ListMultipartUploadsRequest listMultipartUploadsRequest = new ListMultipartUploadsRequest(bucketName);
                // 设置每页列举的分片上传事件个数。
                listMultipartUploadsRequest.setMaxUploads(50);
    
                do {
                    multipartUploadListing = ossClient.listMultipartUploads(listMultipartUploadsRequest);
    
                    for (MultipartUpload multipartUpload : multipartUploadListing.getMultipartUploads()) {
                        // 获取uploadId。
                        System.out.println(multipartUpload.getUploadId());
                        // 获取Key。
                        System.out.println(multipartUpload.getKey());
                        // 获取分片上传的初始化时间。
                        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();
                }
            }
        }
    }

相关文档

  • 关于分片上传的完整示例代码,请参见GitHub示例

  • 分片上传的完整实现涉及三个API接口,详情如下:

  • 关于取消分片上传事件的API接口说明,请参见AbortMultipartUpload

  • 关于列举已上传分片的API接口说明,请参见ListParts

  • 关于列举所有执行中的分片上传事件(即已初始化但尚未完成或已取消的分片上传事件)的API接口说明,请参见ListMultipartUploads