String bucket = "examplebucket-1250000000";
// Objects must be files in JSON or csv format.
String cosPath = "exampleobject";
final String expression = "Select * from COSObject";

SelectObjectContentRequest selectObjectContentRequest = new SelectObjectContentRequest(
        bucket, cosPath, expression, true,
        new InputSerialization(CompressionType.NONE, new JSONInput(JSONType.DOCUMENT)),
        new OutputSerialization(new JSONOutput(","))
);

// Set the query result callback, which may be called multiple times.
selectObjectContentRequest.setSelectObjectContentProgressListener(new SelectObjectContentListener() {
    @Override
    public void onProcess(SelectObjectContentEvent event) {

    }
});
cosXmlService.selectObjectContentAsync(selectObjectContentRequest,
        new CosXmlResultListener() {
    @Override
    public void onSuccess(CosXmlRequest request, CosXmlResult result) {
        SelectObjectContentResult selectObjectContentResult =
                (SelectObjectContentResult) result;
    }

    // If you call the API using kotlin, note that the exception in the callback method must be nullable. Otherwise, the onFail method will not be called, as follows:
    // The type of clientException is CosXmlClientException?, and the type of serviceException is CosXmlServiceException?
    @Override
    public void onFail(CosXmlRequest cosXmlRequest,
                       @Nullable CosXmlClientException clientException,
                       @Nullable CosXmlServiceException serviceException) {
        if (clientException != null) {
            clientException.printStackTrace();
        } else {
            serviceException.printStackTrace();
        }
    }
});