Object Storage Service:Obtain the metadata of an object

Sample code

The following code provides an example on how to obtain object metadata:

// Create a request to synchronously obtain the metadata of an object. 
// Specify the bucket name such as examplebucket and the full path of the object such as exampledir/exampleobject.txt. The full path cannot contain the bucket name. 
HeadObjectRequest head = new HeadObjectRequest("examplebucket", "exampledir/exampleobject.txt");

// Obtain the metadata of the object. 
OSSAsyncTask task = oss.asyncHeadObject(head, new OSSCompletedCallback<HeadObjectRequest, HeadObjectResult>() {
    @Override
    public void onSuccess(HeadObjectRequest request, HeadObjectResult result) {
    
    // Obtain the length of the object. 
        Log.d("headObject", "object Size: " + result.getMetadata().getContentLength()); 
    // Obtain the type of the object. 
        Log.d("headObject", "object Content Type: " + result.getMetadata().getContentType()); 
    }

    @Override
    public void onFailure(HeadObjectRequest request, ClientException clientExcepion, ServiceException serviceException) {
        // Handle request exceptions. 
        if (clientExcepion != null) {
            // Handle client exceptions, such as network exceptions. 
            clientExcepion.printStackTrace();
        }
        if (serviceException != null) {
            // Handle service exceptions. 
            Log.e("ErrorCode", serviceException.getErrorCode());
            Log.e("RequestId", serviceException.getRequestId());
            Log.e("HostId", serviceException.getHostId());
            Log.e("RawMessage", serviceException.getRawMessage());
        }
    }
});

// task.waitUntilFinished(); // Wait until the metadata of the object is obtained. 

References

For more information about the API operation that you can call to obtain object metadata, see GetObjectMeta.