Listing Object Versions (SDK for Java)_Object Storage Service

Function

This API lists some or all of the object versions in a bucket. When listing the object versions, you can specify the criteria such as the prefix, number, and start position. Returned object versions are listed in alphabetical order by object name.

The returned results of ObsClient.listVersions include the object versions and delete markers.

NOTICE:

If you have any questions during development, post them on the Issues page of GitHub.

Restrictions

To list object versions in a bucket, you must be the bucket owner or have the required permission (obs:bucket:ListBucketVersions in IAM or ListBucketVersions in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Creating a Custom Bucket Policy.
The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.
A maximum of 1,000 object versions can be returned in a single request. If a bucket contains more than 1,000 object versions, you can use pagination to list all versions. If ListVersionsResult.isTruncated is true, only part of object versions are returned. In this case, you can use ListVersionsResult.getNextKeyMarker and ListVersionsResult.getNextVersionIdMarker to obtain the start position for the next listing.

Method

obsClient.listVersions(ListVersionsRequest request)

Request Parameters

**Table 1** List of request parameters
Parameter	Type	Mandatory (Yes/No)	Description
request	ListVersionsRequest	Yes	Explanation: Request parameters for listing object versions in a bucket. For details, see Table 2.

**Table 2** ListVersionsRequest parameters
Parameter	Type	Mandatory (Yes/No)	Description
bucketName	String	Yes	Explanation: Bucket name. Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
prefix	String	No	Explanation: Prefix that the names of objects to list must contain. Value range: The value must contain 1 to 1,024 characters. Default value: None
keyMarker	String	No	Explanation: Object name to start with when listing object versions in a bucket. All object versions following this parameter are listed in alphabetical order. Restrictions: This parameter is only available for listing objects with multiple versions. Value range: The value of nextKeyMarker in the response body of the last request. Default value: None
maxKeys	int	No	Explanation: The maximum number of object versions returned in the response in alphabetical order. Value range: The value ranges from 1 to 1000. If the specified value is beyond this range, only 1,000 objects are returned. Default value: 1000
delimiter	String	No	Explanation: This parameter is used to group object names. If a prefix is specified, objects with the same string from the prefix to the first delimiter are grouped into one CommonPrefixes. If no prefix is specified, objects with the same string from the first character to the first delimiter are grouped into one CommonPrefixes. Assume that a bucket has objects abcd, abcde, and bbcde in it. If delimiter is set to d and prefix is set to a, objects abcd and abcde are grouped into a commonPrefix with abcd as the prefix. If only delimiter is set to d, objects abcd and abcde are grouped into a commonPrefix with abcd as the prefix, and bbcde is grouped separately into another commonPrefix with bbcd as the prefix. For a PFS, if this parameter is not specified, all the contents in the current directory are recursively listed by default, and subdirectories are also listed. In big data scenarios, PFSs usually have multiple directory levels and each directory level has a large number of files. In such case, you are advised to configure [delimiter=/] to list the contents in the current directory but exclude the contents in subdirectories, thereby accelerating the listing. Value range: The value must contain 1 to 1,024 characters. Default value: None
versionIdMarker	String	No	Explanation: Version ID you want to start listing from. All object versions following the value specified by this parameter are listed in alphabetical order by object name and version ID. This parameter must be used together with keyMarker. keyMarker specifies the object name, and versionIdMarker specifies the version of the specified object. Restrictions: This parameter is only available for listing objects with multiple versions. If the object version specified by versionIdMarker and the object name specified by keyMarker do not match, versionIdMarker is invalid. Value range: Object version ID, that is, the value of nextVersionIdMarker in the response body of the last request. Default value: None
encodingType	String	No	Explanation: Encoding type for some elements in the response. If delimiter, keyMarker, prefix, nextKeyMarker, and key contain control characters that are not supported by the XML 1.0 standard, you can set encodingType to encode delimiter, keyMarker, prefix (including the prefix in commonPrefixes), nextKeyMarker, and key in the response. Value range: url Default value: None. If you leave this parameter blank, encoding is not applied.

Responses

**Table 3** ListVersionsResult
Parameter	Type	Description
bucketName	String	Explanation: Bucket name. Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
prefix	String	Explanation: Object name prefix. Assume that you have the following objects: logs/day1, logs/day2, logs/day3, and ExampleObject.jpg. If you specify logs/ as the prefix, logs/day1, logs/day2, and logs/day3 will be returned. If this parameter is left blank and there are no other filtering criteria, all objects in the bucket will be returned. Value range: The value must contain 1 to 1,024 characters. Default value: None
versionIdMarker	String	Explanation: Object version for the object specified by KeyMarker. All object versions following the value specified by this parameter are listed in alphabetical order by object name and version ID. This parameter must be used together with KeyMarker. KeyMarker specifies the object name, and versionIdMarker specifies the version of the specified object. Restrictions: This parameter is only available for listing objects with multiple versions. If the object version specified by versionIdMarker and the object name specified by keyMarker do not match, versionIdMarker is invalid. Value range: The value must contain 32 characters. Default value: None
nextVersionIdMarker	String	Explanation: Version ID to start with in the next request for listing object versions. It must be used together with nextKeyMarker. If only part of the object versions are returned for the current request, this parameter is included in the response for your use in the subsequent request. Restrictions: This parameter is only available for listing objects with multiple versions. Value range: The value must contain 32 characters. Default value: None
objectSummaries	List<ObsObject>	Explanation: Object information. For details, see Table 4.
commonPrefixes	List<String>	Explanation: List of object name prefixes grouped according to the delimiter parameter (if specified) Value range: The value must contain 1 to 1,024 characters. Default value: None
truncated	boolean	Explanation: Whether all objects are returned in the response. A maximum of 1,000 objects can be listed at a time. If the number of objects is greater than 1,000, the objects beyond 1,000 cannot be returned. Value range: true: Not all objects are returned. false: All objects are returned. Default value: None
keyMarker	String	Explanation: Object name to start listing from. All object versions following the value specified by this parameter are listed in alphabetical order by object name. Restrictions: This parameter is only available for listing objects with multiple versions. Value range: The value must contain 1 to 1,024 characters. Default value: None
maxKeys	int	Explanation: Maximum number of objects to list. No more than the specified number of objects can be returned in the response in alphabetical order. Value range: The value ranges from 1 to 1000. If the specified value is beyond this range, only 1,000 objects are returned. Default value: 1000
delimiter	String	Explanation: Object names are grouped by this parameter, which is often used with Prefix. If a prefix is specified, objects with the same string from the prefix to the first delimiter are grouped into one CommonPrefixes. If no prefix is specified, objects with the same string from the first character to the first delimiter are grouped into one CommonPrefixes. Assume that a bucket has objects abcd, abcde, and bbcde in it. If delimiter is set to d and prefix is set to a, files abcd and abcde are grouped into a CommonPrefixes with abcd as the prefix. If only delimiter is set to d, files abcd and abcde are grouped into a CommonPrefixes with abcd as the prefix, and bbcde is grouped separately into another CommonPrefixes with bbcd as the prefix. For a PFS, if this parameter is not specified, all the contents in the current directory are recursively listed by default, and subdirectories are also listed. In big data scenarios, PFSs usually have multiple directory levels and each directory level has a large number of files. In such case, you are advised to configure [delimiter=/] to list the contents in the current directory but exclude the contents in subdirectories, thereby accelerating the listing. Value range: The value must contain 1 to 1,024 characters. Default value: None
nextKeyMarker	String	Explanation: Object name to start with for the next request for listing object versions. If only part of the object versions are returned for the current request, this parameter is included in the response for your use in the subsequent request. Restrictions: This parameter is only available for listing objects with multiple versions. Value range: The value must contain 1 to 1,024 characters. Default value: None
location	String	Explanation: Region where a bucket is located. Restrictions: If the endpoint used is obs.myhuaweicloud.com, this parameter is not required. If any other endpoints are used, this parameter is required. Value range: To learn about valid regions and endpoints, see Regions and Endpoints. An endpoint is the request address for calling an API. Endpoints vary depending on services and regions. To obtain the regions and endpoints, contact the enterprise administrator. Default value: If obs.myhuaweicloud.com is used as the endpoint and no region is specified, cn-north-1 (the CN North-Beijing1 region) is used by default.
statusCode	int	Explanation: HTTP status code. Value range: A status code is a group of digits that can be 2xx (indicating successes) or 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code. Default value: None
responseHeaders	Map<String, Object>	Explanation: Response header list, composed of tuples. In a tuple, the String key indicates the name of the header, and the Object value indicates the value of the header. Default value: None
versions	VersionOrDeleteMarker[]	Explanation: Object version information. For details, see Table 8.

**Table 4** ObsObject
Parameter	Type	Description
bucketName	String	Explanation: Bucket name. Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
objectKey	String	Explanation: Object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name. For example, if the address for accessing the object is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt. Value range: The value must contain 1 to 1,024 characters. Default value: None
owner	Owner	Explanation: Owner of the object. For details, see Table 5.
metadata	ObjectMetadata	Explanation: Object metadata. For details, see Table 6.
objectContent	InputStream	Explanation: Object data stream. Default value: None

**Table 5** Owner
Parameter	Type	Mandatory (Yes/No)	Description
id	String	Yes	Explanation: Account (domain) ID of the bucket owner. Value range: To obtain the account ID, see How Do I Get My Account ID and User ID? Default value: None
displayName	String	No	Explanation: Account name of the owner. Value range: To obtain the account name, see How Do I Get My Account ID and User ID? Default value: None

**Table 6** ObjectMetadata
Parameter	Type	Mandatory (Yes/No)	Description
contentLength	Long	No	Explanation: Object size. Restrictions: The object size in a single upload ranges from 0 to 5 GB. To upload files larger than 5 GB, multipart uploads should be used. Default value: If this parameter is not specified, the SDK automatically calculates the size of the object.
contentType	String	No	Explanation: MIME type of the object file. MIME type is a standard way of describing a data type and is used by the browser to decide how to display data. Value range: See What Is Content-Type (MIME)? (Java SDK) Default value: If this parameter is not specified, the SDK determines the file type based on the suffix of the object name and assigns a value to the parameter. For example, if the suffix of the object name is .xml, the object is an application/xml file. If the suffix is .html, the object is a text/html file.
contentEncoding	String	No	Explanation: Content-Encoding header in the response. It specifies which encoding is applied to the object. Default value: None
contentDisposition	String	No	Explanation: Provides a default file name for the requested object. When the object with the default file name is being downloaded or accessed, the content is displayed as part of a web page in the browser or as an attachment in a download dialog box. Default value: None
cacheControl	String	No	Explanation: Cache-Control header in the response. It specifies the cache behavior of the web page when an object is downloaded. Default value: None
contentLanguage	String	No	Explanation: Language or language combination for visitors to customize and use. For details, see the definition of ContentLanguage in the HTTP protocol. Default value: None
expires	String	No	Explanation: The time a cached web page object expires. Restrictions: The time must be in the GMT format. Default value: None
contentMd5	String	No	Explanation: Base64-encoded MD5 value of the file data. It is provided for the OBS server to verify data integrity. The OBS server will compare this MD5 value with the MD5 value calculated based on the file data. If the two values are not the same, HTTP status code 400 is returned. Restrictions: The MD5 value of the file must be Base64 encoded. If the MD5 value is not specified, the OBS server will not verify the MD5 value of the object. Value range: Base64-encoded 128-bit MD5 value of the request body calculated according to RFC 1864. Example: n58IG6hfM7vqI4K0vnWpog== Default value: None
storageClass	StorageClassEnum	No	Explanation: Storage class of an object that can be specified at object creation. If you do not specify this header, the object inherits the storage class of the bucket. Value range: See Table 7. Default value: None
webSiteRedirectLocation	String	No	Explanation: If the bucket is configured with website hosting, the request for obtaining the object can be redirected to another object in the bucket or an external URL. This parameter specifies the address the request for the object is redirected to. The request is redirected to an object anotherPage.html in the same bucket: WebsiteRedirectLocation:/anotherPage.html The request is redirected to an external URL http://www.example.com/: WebsiteRedirectLocation:http://www.example.com/ Restrictions: The value must start with a slash (/), http://, or https:// and cannot exceed 2 KB. OBS only supports redirection for objects in the root directory of a bucket. Default value: None
nextPosition	long	No	Explanation: Start position for the next append upload. Value range: 0 to the object length, in bytes. Default value: None
appendable	boolean	No	Explanation: Whether the object is appendable. Value range: true: The object is appendable. false: The object is not appendable. Default value: None
userMetadata	Map<String, Object>	No	Explanation: User-defined metadata of the object. To define it, you can add a header starting with x-obs-meta- in the request. In Map, the String key indicates the name of the user-defined metadata that starts with x-obs-meta-, and the Object value indicates the value of the user-defined metadata. To obtain the user-defined metadata of an object, use ObsClient.getObjectMetadata. For details, see Obtaining Object Metadata (SDK for Java). Restrictions: An object can have multiple pieces of metadata. The size of the metadata cannot exceed 8 KB in total. When you call ObsClient.getObject to download an object, its user-defined metadata will also be downloaded. Default value: None

**Table 7** StorageClassEnum
Constant	Default Value	Description
STANDARD	STANDARD	Standard storage class
WARM	WARM	Infrequent Access storage class.
COLD	COLD	Archive storage class.

**Table 8** VersionOrDeleteMarker
Parameter	Type	Description
bucketName	String	Explanation: Bucket name. Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
key	String	Explanation: Object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name. For example, if the address for accessing the object is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt. Value range: The value must contain 1 to 1,024 characters. Default value: None
versionId	String	Explanation: Object version ID. Value range: The value must contain 32 characters. Default value: None
isLatest	boolean	Explanation: Whether the object is the latest version. Value range: true: The object is the latest version. false: The object is not the latest version. Default value: false
lastModified	Date	Explanation: Time when the object was last modified. Value range: UTC time Default value: None
owner	Owner	Explanation: User information, including the domain ID and name of the object owner. For details, see Table 5.
etag	String	Explanation: Base64-encoded, 128-bit MD5 value of an object. ETag is the unique identifier of the object contents and is used to determine whether the contents of an object are changed. For example, if the ETag value is A when an object is uploaded and is B when the object is downloaded, this indicates the contents of the object are changed. The ETag reflects changes only to the contents of an object, not its metadata. Objects created by the upload and copy operations have unique ETags after being encrypted using MD5. Restrictions: If an object is encrypted using server-side encryption, the ETag is not the MD5 value of the object. Value range: The value must contain 32 characters. Default value: None
size	long	Explanation: Object size, in bytes. Value range: The value ranges from 0 TB to 48.8 TB, in bytes. Default value: None
storageClass	StorageClassEnum	Explanation: Storage class of an object that can be specified at object creation. If you do not specify this header, the object inherits the storage class of the bucket. Value range: See Table 7. Default value: None
isDeleteMarker	boolean	Explanation: Whether the object version is a delete marker. Value range: true false Default value: None

Code Example: Listing Object Versions in a Bucket

This example lists object versions in bucket examplebucket. A maximum of 1,000 object versions can be returned.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions001 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // Listing object versions.
            ListVersionsResult result = obsClient.listVersions("examplebucket");
            System.out.println("listVersions successfully");
            for (VersionOrDeleteMarker v : result.getVersions()) {
                System.out.println("Key:" + v.getKey());
                System.out.println("Owner:" + v.getOwner());
                System.out.println("isDeleteMarker:" + v.isDeleteMarker());
            }
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

      

    
   

Code Example: Specifying the Version Count to List

This example lists a specified number of object versions in bucket examplebucket.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions002 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List a specified number of object versions.
            ListVersionsResult result = obsClient.listVersions("examplebucket", 100);
            System.out.println("listVersions successfully");
            for (VersionOrDeleteMarker v : result.getVersions()) {
                System.out.println("Key:" + v.getKey());
                System.out.println("Owner:" + v.getOwner());
                System.out.println("isDeleteMarker:" + v.isDeleteMarker());
            }
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

      

    
   

Code Example: Specifying the Version Prefix to List

This example specifies a prefix to list object versions in bucket examplebucket. A maximum of 100 object versions will be returned.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsRequest;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions003 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List object versions by specifying a prefix.
            // List 100 object versions with the specified prefix.
            ListVersionsRequest request = new ListVersionsRequest("examplebucket", 100);
            request.setPrefix("prefix");
            ListVersionsResult result = obsClient.listVersions(request);
            System.out.println("listVersions successfully");
            for (VersionOrDeleteMarker v : result.getVersions()) {
                System.out.println("Key:" + v.getKey());
                System.out.println("Owner:" + v.getOwner());
                System.out.println("isDeleteMarker:" + v.isDeleteMarker());
            }
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

      

    
   

Code Example: Specifying the Start Position to List

This example lists 100 object versions whose names follow test in lexicographical order in bucket examplebucket.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsRequest;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions004 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List objects from a specified start position.
            // List 100 object versions whose names following test in lexicographic order.
            ListVersionsRequest request = new ListVersionsRequest("examplebucket", 100);
            request.setKeyMarker("test");
            ListVersionsResult result = obsClient.listVersions(request);
            System.out.println("listVersions successfully");
            for (VersionOrDeleteMarker v : result.getVersions()) {
                System.out.println("Key:" + v.getKey());
                System.out.println("Owner:" + v.getOwner());
                System.out.println("isDeleteMarker:" + v.isDeleteMarker());
            }
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

      

    
   

Code Example: Using Pagination to List All Versions

This example lists 100 object versions whose names follow test in lexicographical order in bucket examplebucket.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsRequest;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions005 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List all object versions using pagination.
            ListVersionsResult result;
            ListVersionsRequest request = new ListVersionsRequest("examplebucket", 100);
            do {
                result = obsClient.listVersions(request);
                System.out.println("listVersions successfully");
                for (VersionOrDeleteMarker v : result.getVersions()) {
                    System.out.println("Key:" + v.getKey());
                    System.out.println("Owner:" + v.getOwner());
                    System.out.println("isDeleteMarker:" + v.isDeleteMarker());
                }
                request.setKeyMarker(result.getNextKeyMarker());
                request.setVersionIdMarker(result.getNextVersionIdMarker());
            } while (result.isTruncated());
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

      

    
   

Code Example: Listing All Object Versions in a Folder

There is no concept of folders in OBS. All elements stored in OBS buckets are objects. Folders are actually objects whose sizes are 0 and whose names end with a slash (/). You can set a folder name as a prefix to list objects in this folder. This example lists all object versions in a folder.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsRequest;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions006 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            //List all object versions in a folder.
            ListVersionsResult result;
            ListVersionsRequest request = new ListVersionsRequest("examplebucket", 100);
            // Set folder name dir/ as the prefix.
            request.setPrefix("dir/");
            do {
                result = obsClient.listVersions(request);
                System.out.println("listVersions successfully");
                for (VersionOrDeleteMarker v : result.getVersions()) {
                    System.out.println("Key:" + v.getKey());
                    System.out.println("Owner:" + v.getOwner());
                    System.out.println("isDeleteMarker:" + v.isDeleteMarker());
                }
                request.setKeyMarker(result.getNextKeyMarker());
                request.setVersionIdMarker(result.getNextVersionIdMarker());
            } while (result.isTruncated());
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

      

    
   

Code Example: Listing All Object Versions in a Bucket by Folder Name

This example lists all object versions in bucket examplebucket.

    
     
       
       import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ListVersionsRequest;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.VersionOrDeleteMarker;
public class ListVersions007 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // List all object versions in the root directory.
            ListVersionsRequest request = new ListVersionsRequest("examplebucket", 1000);
            request.setDelimiter("/");
            ListVersionsResult result = obsClient.listVersions(request);
            System.out.println("listVersions successfully");
            System.out.println("Objects in the root directory:");
            for (VersionOrDeleteMarker v : result.getVersions()) {
                System.out.println("Key:" + v.getKey());
                System.out.println("Owner:" + v.getOwner());
                System.out.println("isDeleteMarker:" + v.isDeleteMarker());
            }
            listVersionsByPrefix(obsClient, result);
        } catch (ObsException e) {
            System.out.println("listVersions failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("listVersions failed");
            // Print other error information.
            e.printStackTrace();
        }
    }

      

    
   

Code Example: Recursively Listing Object Versions in a Sub-folder

This example recursively lists object versions in a sub-folder.

    
     
       
           // Recursively list object versions in a sub-folder.
    static void listVersionsByPrefix(ObsClient obsClient, ListVersionsResult result) throws ObsException {
        for (String prefix : result.getCommonPrefixes()) {
            System.out.println("Objects in folder [" + prefix + "]:");
            ListVersionsRequest request = new ListVersionsRequest("examplebucket", 1000);
            request.setDelimiter("/");
            request.setPrefix(prefix);
            result = obsClient.listVersions(request);
            for (VersionOrDeleteMarker v : result.getVersions()) {
                System.out.println("Key:" + v.getKey());
                System.out.println("Owner:" + v.getOwner());
                System.out.println("isDeleteMarker:" + v.isDeleteMarker());
            }
            listVersionsByPrefix(obsClient, result);
        }
    }
}

      

    
   

NOTE:

The code examples above do not involve scenarios where there are more than 1,000 object versions in a folder.
Since all folder names end with a slash (/) and the objects and sub-folders to list are under the folder, delimiter is always a slash (/).
In the returned result of each recursion, ListVersionsResult.getVersions includes the object versions under the folder, and ListVersionsResult.getCommonPrefixes includes the sub-folders under the folder.

Listing Object Versions (SDK for Java)

Function

Restrictions

Method

Request Parameters

Responses

Code Example: Listing Object Versions in a Bucket

Code Example: Specifying the Version Count to List

Code Example: Specifying the Version Prefix to List

Code Example: Specifying the Start Position to List

Code Example: Using Pagination to List All Versions

Code Example: Listing All Object Versions in a Folder

Code Example: Listing All Object Versions in a Bucket by Folder Name

Code Example: Recursively Listing Object Versions in a Sub-folder

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