Overview

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

API	Operation	Description
DELETE Object	Deleting an object	Deletes an object from a bucket.
DELETE Multiple Objects	Deleting multiple objects	Deletes multiple objects from a bucket in a single request

SDK API References

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

Deleting a Single Object

Description

This API (DELETE Object) is used to delete a specified 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
DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(bucket,
       cosPath);
cosXmlService.deleteObjectAsync(deleteObjectRequest,
       new CosXmlResultListener() {
   @Override
   public void onSuccess(CosXmlRequest cosXmlRequest, CosXmlResult result) {
       DeleteObjectResult deleteObjectResult = (DeleteObjectResult) result;
   }
    @Override
   public void onFail(CosXmlRequest cosXmlRequest,
                      CosXmlClientException clientException,
                      CosXmlServiceException serviceException) {
       if (clientException != null) {
           clientException.printStackTrace();
       } else {
           serviceException.printStackTrace();
       }
   }
});

Note：

For more samples, please visit GitHub.

Deleting Multiple Objects

Description

This API is used to delete multiple objects in a single request.

Sample code

String bucket = "examplebucket-1250000000"; // Bucket name in the format of BucketName-APPID
List<String> objectList = new ArrayList<String>();
objectList.add("exampleobject1"); // The location identifier of the object in the bucket, i.e., the object key
objectList.add("exampleobject2"); // The location identifier of the object in the bucket, i.e., the object key
DeleteMultiObjectRequest deleteMultiObjectRequest =
       new DeleteMultiObjectRequest(bucket, objectList);
// In quiet mode, only information on objects that fail to be deleted will be returned; otherwise, the deletion result of each object will be returned.
deleteMultiObjectRequest.setQuiet(true);
cosXmlService.deleteMultiObjectAsync(deleteMultiObjectRequest,
       new CosXmlResultListener() {
   @Override
   public void onSuccess(CosXmlRequest cosXmlRequest, CosXmlResult result) {
       DeleteMultiObjectResult deleteMultiObjectResult =
               (DeleteMultiObjectResult) result;
   }
    @Override
   public void onFail(CosXmlRequest cosXmlRequest,
                      CosXmlClientException clientException,
                      CosXmlServiceException serviceException) {
       if (clientException != null) {
           clientException.printStackTrace();
       } else {
           serviceException.printStackTrace();
       }
   }
});

Note：

For more samples, please visit GitHub.

Deleting a Directory

Description

COS uses slashes (/) as the delimiter to show directories in order to achieve the effect of a file system. Therefore, if you want to delete a directory in COS, you need to delete objects that are prefixed with a specified value. For example, the directory prefix/ is actually all objects prefixed with prefix/. Therefore, you can delete all objects prefixed with prefix/ to delete the prefix/ directory.

Currently, COS’s Android SDK did not provide an API to perform this operation. However, you can still do it using a combination of basic operations.

Sample code

String bucket = "examplebucket-1250000000"; // Bucket name in the format of BucketName-APPID
String prefix = "folder1/"; // Specify a prefix
GetBucketRequest getBucketRequest = new GetBucketRequest(bucket);
getBucketRequest.setPrefix(prefix);
// "prefix" indicates the directory to delete.
getBucketRequest.setPrefix(prefix);
// Set the maximum number of traversed objects (up to 1,000 per listobject request)
getBucketRequest.setMaxKeys(1000);
GetBucketResult getBucketResult = null;
do {
   try {
       getBucketResult = cosXmlService.getBucket(getBucketRequest);
       List<ListBucket.Contents> contents = getBucketResult.listBucket.contentsList;
       DeleteMultiObjectRequest deleteMultiObjectRequest = new DeleteMultiObjectRequest(bucket);
       for (ListBucket.Contents content : contents) {
           deleteMultiObjectRequest.setObjectList(content.key);
       }
       cosXmlService.deleteMultiObject(deleteMultiObjectRequest);
       getBucketRequest.setMarker(getBucketResult.listBucket.nextMarker);
   } catch (CosXmlClientException e) {
       e.printStackTrace();
       return;
   } catch (CosXmlServiceException e) {
       e.printStackTrace();
       return;
   }
} while (getBucketResult.listBucket.isTruncated);

Note：

For more samples, please visit GitHub.