public SetObjectTaggingResult setObjectTagging(SetObjectTaggingRequest setObjectTaggingRequest);

String bucketName = "examplebucket-1250000000";
String key = "exampletkey";
List<Tag> tags = new LinkedList<>();
tags.add(new Tag("tag1", "value1"));
tags.add(new Tag("tag2", "value2"));
ObjectTagging objectTagging = new ObjectTagging(tags);
SetObjectTaggingRequest setObjectTaggingRequest = new SetObjectTaggingRequest(bucketName, key, objectTagging);
cosclient.setObjectTagging(setObjectTaggingRequest);

String bucketName = "examplebucket-1250000000";
String key = "testfiles/testTagging.txt";
InputStream is = new ByteArrayInputStream(new byte[]{'d', 'a', 't', 'a'});
ObjectMetadata objectMetadata = new ObjectMetadata();
objectMetadata.setHeader("x-cos-tagging", "tag1=value1&tag2=value2");
cosclient.putObject(bucketName, key, is, objectMetadata);

public GetObjectTaggingResult getObjectTagging(GetObjectTaggingRequest getObjectTaggingRequest);

String bucketName = "exampletbucket-1250000000";
String key = "exampletkey";
GetObjectTaggingRequest getObjectTaggingRequest = new GetObjectTaggingRequest(bucketName, key);
GetObjectTaggingResult getObjectTaggingResult = cosclient.getObjectTagging(getObjectTaggingRequest);
List<Tag> resultTagSet = getObjectTaggingResult.getTagSet();
System.out.println(resultTagSet.toString());

public DeleteObjectTaggingResult deleteObjectTagging(DeleteObjectTaggingRequest deleteObjectTaggingRequest);

String bucketName = "examplebucket-1250000000";
String key = "exampleobject";
DeleteObjectTaggingRequest deleteObjectTaggingRequest = new DeleteObjectTaggingRequest(bucketName, key);
cosclient.deleteObjectTagging(deleteObjectTaggingRequest);