Help Center/ Object Storage Service/ SDK Reference/ Java/ Object Upload (SDK for Java)/ Setting a Callback for a Resumable Upload (SDK for Java)
Updated on 2025-09-22 GMT+08:00
View PDF
Share

Setting a Callback for a Resumable Upload (SDK for Java)

Function

You can specify the callback parameters in a resumable upload (uploadFile) request. After the object is successfully uploaded, OBS calls back the upload result to a specific server and returns the callback result to you.

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

Restrictions

  • To upload an object, you must be the bucket owner or have the required permission (obs:object:PutObject in IAM or PutObject in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Configuring an Object Policy.
  • The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.
  • The file uploaded by the resumable upload API must exceed 100 KB.
  • You must enable the resumable upload option when you use this API, so the progress of the last upload can be obtained for upload resumption.
  • A callback can be performed only after objects are successfully uploaded.

Method

obsClient.uploadFile(UploadFileRequest request)

Request Parameters

Table 1 uploadFile

Parameter

Type

Mandatory (Yes/No)

Description

request

UploadFileRequest

Yes

Explanation:

Request parameters for uploading an object. For details, see Table 2.
Table 2 UploadFileRequest

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 with 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

Yes

Explanation:

Object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path of the object that does not contain the bucket name.

For example, if the access path is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt.

Value range:

The value can contain 1 to 1,024 characters.

Default value:

None

objectMetadata

ObjectMetadata

No

Explanation:

Object metadata. For details, see Table 14.

Default value:

None

acl

AccessControlList

No

Explanation:

An ACL that can be specified at bucket creation. You can use either a pre-defined or a user-defined ACL. For more information about ACLs, see ACLs.

Value range:

  • To use a pre-defined ACL, see Table 3 for the available options.
  • To use a user-defined ACL, see Table 15 to configure the required parameters.

Default value:

AccessControlList.REST_CANNED_PRIVATE

sseKmsHeader

SseKmsHeader

No

Explanation:

Server-side encryption header. For details, see Table 9.

Default value:

None

sseCHeader

SseCHeader

No

Explanation:

Server-side encryption header. For details, see Table 8.

Default value:

None

enableCheckpoint

boolean

No

Explanation:

Whether to enable the resumable mode.

Value range:

true: The resumable mode is enabled.

false: The resumable mode is disabled.

Default value:

false

checkpointFile

String

No

Explanation:

Path of a file generated for recording the progress of a resumable download. The file contains the information about parts and the progress.

Restrictions:

This parameter is valid only in the resumable mode.

Default value:

If this parameter is left blank, the progress file will be in the same directory as the local file to be uploaded.

uploadFile

String

Yes

Explanation:

Full path of the file or folder to be uploaded, for example, aa/bb.txt or aa/.

Default value:

None

extensionPermissionMap

Map<ExtensionObjectPermissionEnum, Set<String>>

No

Explanation:

A permission map for granting bucket ACL permissions to one or more accounts. ExtensionObjectPermissionEnum specifies the permissions to grant, and Set<String> describes the list of account IDs (indicated by domain_id) the granted permissions apply to.

Value range:

Default value:

None

progressListener

ProgressListener

No

Explanation:

Data transmission listener, used for obtaining the upload progress. For details, see Table 4.

partSize

long

No

Explanation:

Part size.

Value range:

The value ranges from 100 KB to 5 GB, in bytes.

Default value:

9MB

taskNum

int

No

Explanation:

Maximum number of files that can be uploaded concurrently in a multipart upload.

Value range:

An integer from 1 to 10000

Default value:

1, indicating concurrent uploads are not used.

encodeHeaders

boolean

No

Explanation:

Whether to enable OBS to automatically encode request headers.

Due to HTTP coding restrictions, only ASCII characters can be sent. If your request headers contain full-width characters, the SDK will URL encode these characters before sending the request. When you use a browser, the browser automatically decodes the data.

Value range:

true: Encoding with SDK is enabled.

false: Encoding with SDK is disabled.

Default value:

true

callback

Callback

No

Explanation:

Upload callback configuration.

Default value:

None
Table 3 Pre-defined ACL

Constant

Description

AccessControlList.REST_CANNED_PRIVATE

Private read/write.

A bucket or object can only be accessed by its owner.

AccessControlList.REST_CANNED_PUBLIC_READ

Public read.

If this permission is granted on a bucket, anyone can read the object list, multipart uploads, bucket metadata, and object versions in the bucket.

If this permission is granted on an object, anyone can read the content and metadata of the object.

AccessControlList.REST_CANNED_PUBLIC_READ_WRITE

Public read/write.

If this permission is granted on a bucket, anyone can read the object list, multipart uploads, and bucket metadata, and can upload or delete objects, initiate multipart uploads, upload parts, assemble parts, copy parts, and abort multipart upload tasks.

If this permission is granted on an object, anyone can read the content and metadata of the object.

AccessControlList.REST_CANNED_PUBLIC_READ_DELIVERED

Public read on a bucket as well as objects in the bucket.

If this permission is granted on a bucket, anyone can read the object list, multipart tasks, and bucket metadata, and can also read the content and metadata of the objects in the bucket.

This permission cannot be granted on objects.

AccessControlList.REST_CANNED_PUBLIC_READ_WRITE_DELIVERED

Public read/write on a bucket as well as objects in the bucket.

If this permission is granted on a bucket, anyone can read the object list, multipart uploads, and bucket metadata, and can upload or delete objects, initiate multipart upload tasks, upload parts, assemble parts, copy parts, and abort multipart uploads. They can also read the content and metadata of the objects in the bucket.

This permission cannot be granted on objects.

AccessControlList.REST_CANNED_BUCKET_OWNER_FULL_CONTROL

If this permission is granted on an object, only the bucket and object owners have the full control over the object.

By default, if you upload an object to a bucket owned by another user, the bucket owner does not have the permissions on your object. After you grant this permission to the bucket owner, the bucket owner can have full control over your object.

For example, if user A uploads object x to user B's bucket, user B does not have the control over object x. If user A sets bucket-owner-full-control for object x, user B then has the control over object x.
Table 4 ProgressListener members

Method

Return Value Type

Mandatory (Yes/No)

Description

progressChanged

void

Yes

Explanation:

Used for obtaining the upload progress. For details, see Table 5.

Default value:

None
Table 5 progressChanged

Parameter

Type

Mandatory (Yes/No)

Description

status

ProgressStatus

Yes

Explanation:

Progress data. For details, see Table 6.

Default value:

None
Table 6 ProgressStatus

Method

Return Value Type

Description

getAverageSpeed()

double

Average transmission rate.

getInstantaneousSpeed()

double

Instantaneous transmission rate.

getTransferPercentage()

int

Transmission progress, in percentage.

getNewlyTransferredBytes()

long

Number of the newly transmitted bytes.

getTransferredBytes()

long

Number of bytes that have been transmitted.

getTotalBytes()

long

Number of the bytes to be transmitted.
Table 7 ExtensionObjectPermissionEnum

Constant

Description

GRANT_READ

Grants a specific tenant the permissions to read the object and object metadata.

GRANT_READ_ACP

Grants a specific tenant the permissions to obtain the object ACL.

GRANT_WRITE_ACP

Grants a specific tenant the permissions to write the object ACL.

GRANT_FULL_CONTROL

Grants a specific tenant the permissions to read the content, metadata, and ACL of the object and write the object ACL.
Table 8 SseCHeader

Parameter

Type

Mandatory (Yes/No)

Description

algorithm

ServerAlgorithm

Yes

Explanation:

SSE-C is used for encrypting objects on the server side.

Value range:

AES256, indicating AES is used to encrypt the object in SSE-C. For details, see Table 10.

Default value:

None

sseAlgorithm

SSEAlgorithmEnum

No

Explanation:

Encryption algorithm.

Restrictions:

Only AES256 is supported.

Value range:

See Table 12.

Default value:

None

sseCKey

byte[]

Yes

Explanation:

Original key used for encrypting the object when SSE-C is used, in byte[] format.

Default value:

None

sseCKeyBase64

String

No

Explanation:

Base64-encoded original key used for encrypting the object when SSE-C is used.

Default value:

None
Table 9 SseKmsHeader

Parameter

Type

Mandatory (Yes/No)

Description

encryption

ServerEncryption

Yes

Explanation:

SSE-KMS is used for encrypting objects on the server side.

Value range:

kms. For details, see Table 11.

Default value:

None

sseAlgorithm

SSEAlgorithmEnum

No

Explanation:

Encryption algorithm.

Restrictions:

Only KMS is supported.

Value range:

See Table 12.

Default value:

None

kmsKeyId

String

No

Explanation:

ID of the KMS master key when SSE-KMS is used.

Value range:

Valid value formats are as follows:

  1. regionID:domainID:key/key_id
  2. key_id

In the preceding formats:

Default value:

  • If this parameter is not specified, the default master key will be used.
  • If there is no such a default master key, OBS will create one and use it by default.
Table 10 ServerAlgorithm

Constant

Default Value

AES256

AES256
Table 11 ServerEncryption

Constant

Default Value

OBS_KMS

kms
Table 12 SSEAlgorithmEnum

Constant

Default Value

KMS

kms

AES256

AES256
Table 13 StorageClassEnum

Constant

Default Value

Description

STANDARD

STANDARD

Standard storage class

WARM

WARM

Infrequent Access storage class.

COLD

COLD

Archive storage class.
Table 14 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 objects 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 name for the requested object. When the object with the default 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

storageClass

StorageClassEnum

No

Explanation:

Object storage class. When creating an object, you can use this header to specify the storage class for the object. If this parameter is not specified, the object inherits the storage class of the bucket.

Value range:

See Table 13.

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.

To another object in the same bucket:

WebsiteRedirectLocation:/anotherPage.html

To an external URL:

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 of objects that are in the root directory.

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 15 AccessControlList

Parameter

Type

Mandatory (Yes/No)

Type

owner

Owner

No

Explanation:

Bucket owner information. For details, see Table 16.

delivered

boolean

No

Explanation:

Whether the bucket ACL is applied to all objects in the bucket.

Value range:

true: The bucket ACL is applied to all objects in the bucket.

false: The bucket ACL is not applied to any objects in the bucket.

Default value:

false

grants

Set<GrantAndPermission>

No

Explanation:

Grantee information. For details, see Table 17.
Table 16 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 17 GrantAndPermission

Parameter

Type

Mandatory (Yes/No)

Description

grantee

GranteeInterface

Yes

Explanation:

Grantees (users or user groups). For details, see Table 19.

permission

Permission

Yes

Explanation:

Permissions to grant.

Value range:

See Table 18.

Default value:

None

delivered

boolean

No

Explanation:

Whether the bucket ACL is applied to all objects in the bucket.

Value range:

true: The bucket ACL is applied to all objects in the bucket.

false: The bucket ACL is not applied to any objects in the bucket.

Default value:

false
Table 18 Permission

Constant

Default Value

Description

PERMISSION_READ

READ

Read permission.

A grantee with this permission for a bucket can obtain the list of objects, multipart uploads, bucket metadata, and object versions in the bucket.

A grantee with this permission for an object can obtain the object content and metadata.

PERMISSION_WRITE

WRITE

Write permission.

A grantee with this permission for a bucket can upload, overwrite, and delete any object or part in the bucket.

This permission is not available for objects.

PERMISSION_READ_ACP

READ_ACP

Permission to read an ACL.

A grantee with this permission can obtain the ACL of a bucket or object.

A bucket or object owner has this permission for their bucket or object by default.

PERMISSION_WRITE_ACP

WRITE_ACP

Permission to modify an ACL.

A grantee with this permission can update the ACL of a bucket or object.

A bucket or object owner has this permission for their bucket or object by default.

This permission allows the grantee to change the access control policies, meaning the grantee has full control over a bucket or object.

PERMISSION_FULL_CONTROL

FULL_CONTROL

Full control access, including read and write permissions for a bucket and its ACL, or for an object and its ACL.

A grantee with this permission for a bucket has READ, WRITE, READ_ACP, and WRITE_ACP permissions for the bucket.

A grantee with this permission for an object has READ, READ_ACP, and WRITE_ACP permissions for the object.
Table 19 GranteeInterface

Parameter

Description

CanonicalGrantee

Explanation:

Grantee (user) information. For details, see Table 20.

GroupGrantee

Explanation:

Grantee (user group) information.

Value range:

See Table 21.

Default value:

None
Table 20 CanonicalGrantee

Parameter

Type

Mandatory (Yes/No)

Description

grantId

String

Yes if Type is set to GranteeUser

Explanation:

Account (domain) ID of the grantee.

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 grantee.

Value range:

To obtain the account name, see How Do I Get My Account ID and User ID?

Default value:

None
Table 21 GroupGrantee

Constant

Description

ALL_USERS

All users.

AUTHENTICATED_USERS

Authorized users. This constant is deprecated.

LOG_DELIVERY

Log delivery group. This constant is deprecated.
Table 22 Callback

Parameter

Type

Mandatory (Yes/No)

Description

callbackUrl

String

Yes

Explanation:

After an object is uploaded successfully, OBS sends a callback request to the URL using the POST method.

Restrictions:

  • You can specify a maximum of 10 URLs. Use semicolons (;) to separate URLs.
  • URL-encoding is required. For example, http://www.example.com/Chinese?key=Chinese name should be encoded into http://www.example.com/%E4%B8%AD%E6%96%87?key=%E4%B8%AD%E6%96%87%E5%90%8D.

callbackHost

String

No

Explanation:

Value of the Host header in the callback request.

Restrictions:

If callbackHost is not specified, the value of host parsed from the callbackUrl parameter is used.

callbackBody

String

Yes

Explanation:

Body of the callback request.

Restrictions:

The body format must comply with the media type specified in the callbackBodyType field.

Default value:

The callback body supports system variables and custom variables. Custom variables are those starting with x:. For example, in key=$(key)&hash=$(etag)&fileid=$(x:fileid), variables key and etag are system variables, and x:fileid is a custom variable. If the object to be uploaded is an image, you can use imageInfo.width and imageInfo.height in the parameter to indicate the width and height of the image. Example: key=$(key)&hash=$(etag)&w=$(imageInfo.width)&h=$(imageInfo.height)

callbackBodyType

String

No

Explanation:

Value of the Content-Type header in the callback request.

Value range:

  • application/x-www-form-urlencoded
  • application/json

Default value:

If this parameter is not set, the default value application/json is used.

Responses

Table 23 CompleteMultipartUploadResult

Parameter

Type

Description

statusCode

int

Explanation:

HTTP status code.

Value range:

A status code is a group of digits indicating the status of a response. It ranges from 2xx (indicating successes) to 4xx or 5xx (indicating errors).

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

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 with 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 of the object that does not contain the bucket name.

For example, if the access path is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt.

Value range:

The value can contain 1 to 1,024 characters.

Default value:

None

etag

String

Explanation

ETag of an object, which is a Base64-encoded 128-bit MD5 digest. ETag is the unique identifier of the object content. It can be used to determine whether the object content is changed. For example, if the ETag is A when an object is uploaded and is B when the object is downloaded, the object content is changed. The ETag reflects changes only to the contents of the object, not its metadata. An object created by an upload or copy operation has a unique ETag.

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

versionId

String

Explanation

Object version ID. If versioning is enabled for the bucket, the object version number will be returned.

Value range:

The value must contain 32 characters.

Default value:

None

callbackResponseBody

java.io.InputStream

Explanation:

Callback response body stream.

Restrictions:

This parameter is returned only when Callback is set in UploadFileRequest.

Default value:

None

Code Examples

This example sets a callback for a resumable upload (uploadFile) request.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
 
import com.obs.services.ObsClient;
import com.obs.services.ObsConfiguration;
import com.obs.services.exception.ObsException;
import com.obs.services.model.Callback;
import com.obs.services.model.CompleteMultipartUploadResult;
import com.obs.services.model.UploadFileRequest;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
public class UploadFileWithCallback {
    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 North-Beijing4 is used here as an example. Replace it with the one currently in use.
        // Obtain an endpoint using environment variables or import it in other ways.
        // String endPoint = System.getenv("ENDPOINT");
        String endPoint = "https://obs.cn-north-4.myhuaweicloud.com";
        ObsConfiguration configuration = new ObsConfiguration();
        configuration.setEndPoint(endPoint);
        // Create an ObsClient instance.
        try (ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint)) {
            UploadFileRequest request = new UploadFileRequest("example-bucket", "exampleObjectKey");
            // Configure the local file to be uploaded. localfile is the path of the file to be uploaded. You must specify a file name with the extension.
            request.setUploadFile("localfile");
            // Set the maximum number of parts that can be concurrently uploaded.
            request.setTaskNum(5);
            // Set the part size to 10 MB.
            request.setPartSize(5 * 1024 * 1024);
            // Enable the resumable upload.
            request.setEnableCheckpoint(true);
            Callback callback = new Callback();
            callback.setCallbackUrl("callbackUrl1; callbackUrl2");//Mandatory. A maximum of 10 URLs can be set. Separate them with semicolons (;).
            callback.setCallbackHost("Host");//Optional. It indicates the value of the Host header in the callback request. If this parameter is not set, the Host field parsed from callbackUrl is used.
            callback.setCallbackBody("key=$(key)&hash=$(etag)");//Mandatory. Body of the callback request. The key and etag variables are system variables.
            callback.setCallbackBodyType("application/json");//Optional. Value of the Content-Type header in the callback request. If this parameter is not set, the default value is application/x-www-form-urlencoded.
            request.setCallback(callback);
            // Perform a resumable upload.
            CompleteMultipartUploadResult result = obsClient.uploadFile(request);
            // Obtain the callback response.
            InputStream input = result.getCallbackResponseBody();
            if(input != null){
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                // Print the callback response.
                StringBuilder sb = new StringBuilder();
                for(String line; (line = reader.readLine())!=null; sb.append(line));
                System.out.println(sb);
                input.close();
                System.out.println("UploadFileWithCallback successfully");
            } else {
                System.out.println("UploadFileWithCallback failed, callback response is null");
            }
        } catch (ObsException e) {
            // If there is an exception, you can call the API again to resume the upload.
            System.out.println("UploadFileWithCallback 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("UploadFileWithCallback failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

Helpful Links