Obtaining the Download Progress (SDK for Java)
Function
This API returns the download progress of a specified object.
You can call GetObjectRequest.setProgressInterval to obtain the download progress.
If you have any questions during development, post them on the Issues page of GitHub.
Restrictions
- To obtain the download progress, you must be the bucket owner or have the required permission (obs:object:GetObject in IAM or GetObject 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.
- You can obtain the download progress when downloading an object in streaming, partial, or resumable mode.
Method
GetObjectRequest.setProgressListener(ProgressListener progressListener)
Request parameters
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
progressListener |
Yes |
Explanation: Data transmission listener used for obtaining the progress. For details, see Table 2. |
Method |
Return Value Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
void |
Yes |
Explanation: Used for obtaining the progress. For details, see Table 3. |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
status |
Yes |
Explanation: Progress data. For details, see Table 4. |
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. |
Code Examples
This example returns the progress of downloading object objectname.
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import com.obs.services.ObsClient; import com.obs.services.exception.ObsException; import com.obs.services.model.GetObjectRequest; import com.obs.services.model.ObsObject; import com.obs.services.model.ProgressListener; import com.obs.services.model.ProgressStatus; import java.io.ByteArrayOutputStream; import java.io.InputStream; public class GetObject003 { 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 { // Obtain the download progresses. GetObjectRequest request = new GetObjectRequest("examplebucket", "objectname"); request.setProgressListener( new ProgressListener() { @Override public void progressChanged(ProgressStatus status) { // Obtain the average download rate. System.out.println("AverageSpeed:" + status.getAverageSpeed()); // Obtain the download progress in percentage. System.out.println("TransferPercentage:" + status.getTransferPercentage()); } }); // Refresh the download progress each time 1 MB data is downloaded. request.setProgressInterval(1024 * 1024L); ObsObject obsObject = obsClient.getObject(request); // Read the object content. System.out.println("Object content:"); InputStream input = obsObject.getObjectContent(); byte[] b = new byte[1024]; ByteArrayOutputStream bos = new ByteArrayOutputStream(); int len; while ((len = input.read(b)) != -1) { bos.write(b, 0, len); } System.out.println("getObjectContent successfully"); System.out.println(new String(bos.toByteArray())); bos.close(); input.close(); } catch (ObsException e) { System.out.println("getObjectContent 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("getObjectContent failed"); // Print other error information. e.printStackTrace(); } } } |
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