cd springboot-learning-example
mvn clean install

...
2017-03-01 16:31:38.473 INFO 9896 --- [      main] o.s.j.e.a.AnnotationMBeanExporter    : Registering beans for JMX exposure on startup
2017-03-01 16:31:38.538 INFO 9896 --- [      main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8081 (http)
2017-03-01 16:31:38.547 INFO 9896 --- [      main] org.spring.springboot.ClientApplication : Started ClientApplication in 6.055 seconds (JVM running for 7.026)
City{id=1, provinceId=2, cityName='温岭', description='是我的故乡'}

├── pom.xml
└── src
  └── main
    ├── java
    │  └── org
    │    └── spring
    │      └── springboot
    │        ├── ServerApplication.java
    │        ├── domain
    │        │  └── City.java
    │        └── dubbo
    │          ├── CityDubboService.java
    │          └── impl
    │            └── CityDubboServiceImpl.java
    └── resources
      └── application.properties

4.0.0  springboot  springboot-dubbo-server  0.0.1-SNAPSHOT  springboot-dubbo 服务端:: 整合 Dubbo/ZooKeeper 详解 SOA 案例  
      org.springframework.boot    spring-boot-starter-parent    1.5.1.RELEASE        1.0.0        
          io.dubbo.springboot      spring-boot-starter-dubbo      ${dubbo-spring-boot}        
          org.springframework.boot      spring-boot-starter-web        
          org.springframework.boot      spring-boot-starter-test      test        
          junit      junit      4.12

## Dubbo 服务提供者配置
spring.dubbo.application.name=provider
spring.dubbo.registry.address=zookeeper://127.0.0.1:2181
spring.dubbo.protocol.name=dubbo
spring.dubbo.protocol.port=20880
spring.dubbo.scan=org.spring.springboot.dubbo

spring.dubbo.application.name 应用名称
spring.dubbo.registry.address 注册中心地址
spring.dubbo.protocol.name 协议名称
spring.dubbo.protocol.port 协议端口
spring.dubbo.scan dubbo 服务类包目录
c.CityDubboServiceImpl.java 城市业务 Dubbo 服务层实现层类
// 注册为 Dubbo 服务
@Service(version = "1.0.0")
public class CityDubboServiceImpl implements CityDubboService {
  public City findCityByName(String cityName) {
    return new City(1L,2L,"温岭","是我的故乡");
  }
}
@Service 注解标识为 Dubbo 服务，并通过 version 指定了版本号。

springboot-dubbo-client 工程目录结构
├── pom.xml
└── src
  └── main
    ├── java
    │  └── org
    │    └── spring
    │      └── springboot
    │        ├── ClientApplication.java
    │        ├── domain
    │        │  └── City.java
    │        └── dubbo
    │          ├── CityDubboConsumerService.java
    │          └── CityDubboService.java
    └── resources
      └── application.properties

## 避免和 server 工程端口冲突
server.port=8081
## Dubbo 服务消费者配置
spring.dubbo.application.name=consumer
spring.dubbo.registry.address=zookeeper://127.0.0.1:2181
spring.dubbo.scan=org.spring.springboot.dubbo

@Component
public class CityDubboConsumerService {
  @Reference(version = "1.0.0")
  CityDubboService cityDubboService;
  public void printCity() {
    String cityName="温岭";
    City city = cityDubboService.findCityByName(cityName);
    System.out.println(city.toString());
  }
}

@SpringBootApplication
public class ClientApplication {
  public static void main(String[] args) {
    // 程序启动入口
    // 启动嵌入式的 Tomcat 并初始化 Spring 环境及其各 Spring 组件
    ConfigurableApplicationContext run = SpringApplication.run(ClientApplication.class, args);
    CityDubboConsumerService cityService = run.getBean(CityDubboConsumerService.class);
    cityService.printCity();
  }
}