public class InstanceTest {
    private static Logger logger = LoggerFactory.getLogger(InstanceTest.class);

    @Test
    public void testDescribeInstances() {
        EnvContext context = new EnvContext("ACCESS_KEY_ID_EXAMPLE", "SECRET_ACCESS_KEY_EXAMPLE");
        context.setProtocol("https");
        context.setHost("api.qingcloud.com");
        context.setPort("443");
        context.setZone("pek3b");
        context.setApiLang("zh-cn"); // optional, set return message i18n, default to us-en
        InstanceService service = new InstanceService(context);

        InstanceService.DescribeInstancesInput input = new InstanceService.DescribeInstancesInput();
        input.setLimit(1);

        try {
            InstanceService.DescribeInstancesOutput output = service.describeInstances(input);
            for (Types.InstanceModel model : output.getInstanceSet()) {
                System.out.println("==================");
                System.out.println(model.getInstanceID());
                System.out.println(model.getInstanceName());
                System.out.println(model.getImage().getImageID());
                for (Types.NICVxNetModel vxNetModel : model.getVxNets()) {
                    System.out.println("==================");
                    System.out.println(vxNetModel.getVxNetID());
                    System.out.println(vxNetModel.getVxNetType());
                }
            }
        } catch (QCException e) {
            e.printStackTrace();
        }
    }
}