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Querying Object Metadata

Last updated: 2022-01-24 12:37:08

    Overview

    This document provides an overview of APIs and SDK code samples related to querying object metadata.

    API Operation Description
    HEAD Object Querying object metadata Queries the metadata of an object.

    SDK API References

    For the parameters and method descriptions of all the APIs in the SDK, see SDK API Reference.

    Querying Object Metadata

    Description

    This API is used to query the metadata of an object.

    Sample code

    String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
    String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
    HeadObjectRequest headObjectRequest = new HeadObjectRequest(bucket, cosPath);
    cosXmlService.headObjectAsync(headObjectRequest, new CosXmlResultListener() {
       @Override
       public void onSuccess(CosXmlRequest request, CosXmlResult result) {
           HeadObjectResult headObjectResult = (HeadObjectResult) result;
       }
        // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
       // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
       @Override
       public void onFail(CosXmlRequest cosXmlRequest,
                          @Nullable CosXmlClientException clientException,
                          @Nullable CosXmlServiceException serviceException) {
           if (clientException != null) {
               clientException.printStackTrace();
           } else {
               serviceException.printStackTrace();
           }
       }
    });
    
    Note:

    For more samples, please visit GitHub.

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