Dubbo学习二之简单示例

服务提供者

定义服务接口: (该接口需单独打包，在服务提供方和消费方共享)

DemoService.java

packagecom.alibaba.dubbo.demo;

 

publicinterface DemoService {

 

    String sayHello(String name);

 

}

在服务提供方实现接口：(对服务消费方隐藏实现)

DemoServiceImpl.java

packagecom.alibaba.dubbo.demo.provider;

 

importcom.alibaba.dubbo.demo.DemoService;

 

publicclass DemoServiceImpl implementsDemoService {

 

    publicString sayHello(String name) {

        return"Hello " + name;

    }

 

}

用Spring配置声明暴露服务：

provider.xml

<?xmlversion="1.0"encoding="UTF-8"?>

<beansxmlns="<a href="http://www.springframework.org/schema/beans" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://www.springframework.org/schema/beans"

    xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://www.w3.org/2001/XMLSchema-instance"

    xmlns:dubbo="<a href="http://code.alibabatech.com/schema/dubbo" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">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        <a href="http://code.alibabatech.com/schema/dubbo/dubbo.xsd" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

 

    <!-- 提供方应用信息，用于计算依赖关系 -->

    <dubbo:applicationname="hello-world-app" />

 

    <!-- 使用multicast广播注册中心暴露服务地址 -->

    <dubbo:registryaddress="multicast://224.5.6.7:1234"/>

 

    <!-- 用dubbo协议在20880端口暴露服务 -->

    <dubbo:protocolname="dubbo"port="20880"/>

 

    <!-- 声明需要暴露的服务接口 -->

    <dubbo:serviceinterface="com.alibaba.dubbo.demo.DemoService"ref="demoService"/>

 

    <!-- 和本地bean一样实现服务 -->

    <beanid="demoService"class="com.alibaba.dubbo.demo.provider.DemoServiceImpl"/>

 

</beans>

加载Spring配置：

Provider.java

importorg.springframework.context.support.ClassPathXmlApplicationContext;

 

publicclass Provider {

 

    publicstatic void main(String[] args) throwsException {

        ClassPathXmlApplicationContext context = newClassPathXmlApplicationContext(newString[] {"<a href="http://10.20.160.198/wiki/display/dubbo/provider.xml" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://10.20.160.198/wiki/display/dubbo/provider.xml"});

        context.start();

 

        System.in.read();// 按任意键退出

    }

 

}

服务消费者

通过Spring配置引用远程服务：

consumer.xml

<?xmlversion="1.0"encoding="UTF-8"?>

<beansxmlns="<a href="http://www.springframework.org/schema/beans" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://www.springframework.org/schema/beans"

    xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://www.w3.org/2001/XMLSchema-instance"

    xmlns:dubbo="<a href="http://code.alibabatech.com/schema/dubbo" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">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        <a href="http://code.alibabatech.com/schema/dubbo/dubbo.xsd" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">http://code.alibabatech.com/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:applicationname="consumer-of-helloworld-app" />

 

    <!-- 使用multicast广播注册中心暴露发现服务地址 -->

    <dubbo:registryaddress="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:referenceid="demoService"interface="com.alibaba.dubbo.demo.DemoService"/>

 

</beans>

加载Spring配置，并调用远程服务：(也可以使用IoC注入)

Consumer.java

importorg.springframework.context.support.ClassPathXmlApplicationContext;

importcom.alibaba.dubbo.demo.DemoService;

 

publicclass Consumer {

 

    publicstatic void main(String[] args) throwsException {

        ClassPathXmlApplicationContext context = newClassPathXmlApplicationContext(newString[] {"<a href="http://10.20.160.198/wiki/display/dubbo/consumer.xml" "="" style="outline: none; text-decoration: none; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.2em !important; margin: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-size: 1em !important; min-height: inherit !important; color: rgb(0, 51, 102) !important; background: none !important;">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

    }

 

}