• Object Storage Service

obs
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  2. Object Storage Service
  3. Developer Guide (Java SDK)
  4. Object Download
  5. Performing a Partial Download

Performing a Partial Download

When only partial data of an object is required, you can download data falling within a specific range. If the specified range is 0 to 1000, data at the 0th to the 1000th bytes, 1001 bytes in total, will be returned. If the specified range is invalid, data of the whole object will be returned. Sample code is as follows:

String endPoint = "yourdomainname";
String ak = "*** Provide your Access Key ***";
String sk = "*** Provide your Secret Key ***";

// Create an instance of ObsClient.
final ObsClient obsClient = new ObsClient(ak, sk, endPoint);

GetObjectRequest request = new GetObjectRequest("bucketname", "objectkey");
// Specify the start and end positions.
request.setRangeStart(0l);
request.setRangeEnd(1000l);
ObsObject obsObject = obsClient.getObject(request);

// Obtain data.
byte[] buf = new byte[1024];
InputStream in = obsObject.getObjectContent();
for (int n = 0; n != -1; ) {
    n = in.read(buf, 0, buf.length);
}

in.close();

// Close obsClient.
obsClient.close();
NOTE:
  • If the specified range is invalid (because the start or end position is set to a negative integer or the range is larger than the object length), data of the whole object will be returned.