Dubbo 采用全 Spring 配置方式,透明化接入应用,对应用没有任何 API 侵入,只需用 Spring 加载 Dubbo 的配置即可,Dubbo 基于 Spring 的 Schema 扩展进行加载。
如果不想使用 Spring 配置,可以通过 API 的方式 进行调用。
完整安装步骤,请参见:示例提供者安装
DemoService.java ^1:
package com.alibaba.dubbo.demo; public interface DemoService { String sayHello(String name); }
DemoServiceImpl.java ^2:
package com.alibaba.dubbo.demo.provider; import com.alibaba.dubbo.demo.DemoService; public class DemoServiceImpl implements DemoService { public String sayHello(String name) { return "Hello " + name; } }
provider.xml:
<?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://dubbo.apache.org/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/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multicast广播注册中心暴露服务地址 --> <dubbo:registry address="multicast://224.5.6.7:1234" /> <!-- 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.alibaba.dubbo.demo.DemoService" ref="demoService" /> <!-- 和本地bean一样实现服务 --> <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" /> </beans>
Provider.java:
import org.springframework.context.support.ClassPathXmlApplicationContext; public class Provider { public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"http://10.20.160.198/wiki/display/dubbo/provider.xml"}); context.start(); System.in.read(); // 按任意键退出 } }
完整安装步骤,请参见:示例消费者安装
consumer.xml:
<?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://dubbo.apache.org/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd"> <!-- 消费方应用名,用于计算依赖关系,不是匹配条件,不要与提供方一样 --> <dubbo:application name="consumer-of-helloworld-app" /> <!-- 使用multicast广播注册中心暴露发现服务地址 --> <dubbo:registry address="multicast://224.5.6.7:1234" /> <!-- 生成远程服务代理,可以和本地bean一样使用demoService --> <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.DemoService" /> </beans>
Consumer.java [^3]:
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.alibaba.dubbo.demo.DemoService; public class Consumer { public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"http://10.20.160.198/wiki/display/dubbo/consumer.xml"}); context.start(); DemoService demoService = (DemoService)context.getBean("demoService"); // 获取远程服务代理 String hello = demoService.sayHello("world"); // 执行远程方法 System.out.println( hello ); // 显示调用结果 } }
[^3]: 也可以使用 IoC 注入