DUBBO 泛化调用

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什么是泛化调用？

说白一点就是服务消费者并没有服务的接口。

先定义一个简单的接口

public interface EasyCommonService {            public String helloService(String name);    }

接口的具体实现

public class EasyCommonServiceImpl implements EasyCommonService {        public String helloService(String name) {          System.out.println("name is "+ name);          return "hello " + name;      }    }

服务端的spring配置文件

<?xml version="1.1" 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 owner="lyncc" name="bazinga-app" />      <!--zookeeper注册中心 -->      <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"/>             <dubbo:protocol name ="dubbo" port="20880" />            <bean id="easyCommonService" class="org.bazinga.service.impl.EasyCommonServiceImpl" />      <dubbo:service  interface="org.bazinga.service.EasyCommonService" ref="easyCommonService" />        </beans>

消费端的spring配置文件

<?xml version="1.1" 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 owner="lyncc" name="bazinga-consumer" />      <!--zookeeper注册中心 -->      <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"/>             <dubbo:reference id="easyCommonService" interface="org.bazinga.service.EasyCommonService" generic="true"/>         </beans>

有两点需要注意：第一个是interface，其实该接口在消费者并不存在，第二个地方需要注意的地方就是generic="true"，表示该接口支持泛型调用。

public class DubboConsumerGenericService {                  public static void main(String[] args) {                              /////////////////Spring泛化调用/////////        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                "spring-dubbo-consumer-generic.xml");        context.start();                GenericService easyCommonService = (GenericService) context.getBean("easyCommonService");        Object result = easyCommonService.$invoke("helloService", new String[] { "java.lang.String" }, new Object[] { "hello" });        System.out.println(result);                        }    }

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