Dubbo - 03用法示例

Dubbo - 03用法示例

（1）配置

官方文档： http://dubbo.apache.org/zh/docs/v2.7/user/configuration/

                      

消费端Consumer配置（遵循： 精确优先；消费者设置优先）

    <!-- timeout: 默认是1000ms；  retries: 重试次数，不包含第一次调用 -->
    <dubbo:reference id="userService" interface="com.bearpx.dubbo.user.api.UserService"
                     check="false" timeout="5000" retries="3" version="1.0.0" >
        <dubbo:method name="getUser" timeout="5000" />
    </dubbo:reference>
    <!-- 配置当前消费者的统一规则： 所有的服务都不检查-->
    <dubbo:consumer check="false" timeout="5000"/> 

服务端Provider配置

    <bean id="userServiceImpl" class="com.bearpx.dubbo.user.api.impl.UserServiceImpl" />
    <!--4. 暴露服务  ref： 指向服务的真正的实现对象 -->
    <dubbo:service interface="com.bearpx.dubbo.user.api.UserService" ref="userServiceImpl"
                   timeout="5000" retries="3" version="1.0.0"/>

 

（2）多版本

    <!--4. 暴露服务-->
    <dubbo:service interface="com.bearpx.dubbo.user.api.UserService" ref="userServiceImpl"
                   timeout="5000" retries="3" version="1.0.0"/>

    <dubbo:service interface="com.bearpx.dubbo.user.api.UserService" ref="userServiceImpl02"
                   timeout="5000" retries="4" version="2.0.0"/>
    <bean id="userServiceImpl02" class="com.bearpx.dubbo.user.api.impl.UserServiceImpl" />

 

（3）本地存根

  <dubbo:service interface="com.bearpx.dubbo.user.api.UserService" ref="userServiceImpl02"
                   timeout="5000" retries="4" version="2.0.0" 
                   stub="com.bearpx.dubbo.user.api.impl.UserServiceStub"/>

public class UserServiceStub implements UserService {

    private UserService userService;

    public UserServiceStub(UserService userService){
        super();
        this.userService = userService;
    }

    @Override
    public List<User> getUser(String userId) {
        System.out.println("UserServiceStub...getUser()...");
        if(!StringUtils.isEmpty(userId)){
            return userService.getUser(userId);
        }
        return null;
    }
}

 

（4）SpringBoot与Dubbo整合方式

（4.1）导入 dubbo-spring-boot-starter,在application.properties配置属性，使用@Service暴露服务，使用@Reference引用服务，开启注解@EnableDubbo

（4.2）保留 dubbo xml配置文件,导入dubbo-spring-boot-starter，使用@ImportResource导入Dubbo的配置文件即可

@ImportResource(locations = "classpath:dubbo-provider.xml")
@SpringBootApplication
public class UserProviderApplicationV3 {}

（4.3）使用注解API方式，将每一个组件手动创建到容器中

@Configuration
public class MyDubboConfig {

    @Bean
    public ApplicationConfig applicationConfig(){
        ApplicationConfig applicationConfig = new ApplicationConfig();
        applicationConfig.setName("user-service-provider-config");
        return  applicationConfig;
    }

    @Bean
    public RegistryConfig registryConfig(){
        RegistryConfig registryConfig = new RegistryConfig();
        registryConfig.setProtocol("zookeeper");
        registryConfig.setAddress("192.168.100.86:2181");
        return registryConfig;
    }

    @Bean
    public ProtocolConfig protocolConfig(){
        ProtocolConfig protocolConfig = new ProtocolConfig();
        protocolConfig.setName("dubbo");
        protocolConfig.setPort(20888);
        return protocolConfig;
    }
}