01_dubbo实例_服务分组

【为什么要服务分组？】

当一个接口有多种实现时，可以用group区分。

【 Provider 的配置信息】

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
                            http://code.alibabatech.com/schema/dubbo
                            http://code.alibabatech.com/schema/dubbo/dubbo.xsd">


    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="hello-world-app"  />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="com.higgin.dubbo.service.AnimalService" ref="catService" group="catGroup" />
    <dubbo:service interface="com.higgin.dubbo.service.AnimalService" ref="dogService" group="dogGroup" />

    <!-- 和本地bean一样实现服务 -->
    <bean id="catService" class="com.higgin.dubbo.service.impl.CatServiceImpl"/>
    <bean id="dogService" class="com.higgin.dubbo.service.impl.DogServiceImpl"/>
</beans>

【Provider 启动服务】

public static void main(String[] args) throws Exception{
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        context.start();
        System.in.read();
    }

【 Consumer 配置信息】

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo
       http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <dubbo:application name="dubbo-client" />

    <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" />
    
    <dubbo:reference interface="com.higgin.dubbo.service.AnimalService"
                     id="catService"
                     group="catGroup"/>

    <dubbo:reference interface="com.higgin.dubbo.service.AnimalService"
                     id="dogService"
                     group="dogGroup"/>
    
</beans>

【Consumer 消费服务】

public static void main(String[] args) throws Exception{
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
    AnimalService catService = context.getBean("catService",AnimalService.class);
    System.out.println(catService.sayHello());

    AnimalService dogService = context.getBean("dogService",AnimalService.class);
    System.out.println(dogService.sayHello());
}

【注意】

Consumer只能消费与自己服务分组相同的Provider的服务