@Service public class UserServiceImpl implements UserService { @Override public User getUserById(int id) { // ... } } <dubbo:application name="user-service-provider"/> <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"/> <dubbo:protocol name="dubbo" port="20880"/> <dubbo:service interface="com.example.UserService" ref="userServiceImpl"/> public class UserController { public static void main(String[] args) { // ... } } <dubbo:application name="user-service-consumer"/> <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"/> <dubbo:reference interface="com.example.UserService" id="userService"/>