dubbo 部分配置的关系-dubbo github 官方案例

1、dubbo 有一个 dubbo.properties 作为默认配置

默认配置可以在不添加新的配置的前提下使用dubbo

dubbo.properties 的内容（来自 https://github.com/alibaba/dubbo）

2、dubbo 学习参考链接

·dubbo-admin管理控制台的安装和使用：http://www.cnblogs.com/aqsunkai/p/6690607.html
·dubbo官网，下载和配置说明：http://dubbo.io/
·dubbo结合Spring:http://blog.csdn.net/congcong68/article/details/41113239
·dubbo 配置：http://www.cnblogs.com/linjiqin/p/5859153.html
·zookeeper 基本含义: http://blog.csdn.net/gyflyx/article/details/18652913

3、本地环境搭建-zookeeper(windows 环境)

http://blog.csdn.net/bestcxx/article/details/73440892

4、从github下载 dubbo 测试所需的几个工程

https://github.com/alibaba/dubbo

先全部下载，然后取其中的 dubbo-admin和dubbo-demo

dubbo-admin是dubbo监控平台，可以打包为war或者直接jetty运行(maven 配置 jetty 插件),启动后访问 http://localhost:9999/dubbo-admin 端口9999看你怎么定义了

需要输入用户名和密码：root/root

之后点击返回首页

然后进入预期的界面了

dubbo-demo聚合了demo-api\demo-consumer\demo-provider

demo-api是接口，demo-proveider 实现了demo-api

demo-provider是提供者

demo-consumer是消费者

demo-provider和demo-consumer 都是在test中提供main方法启动，demo-consumer 一直调用，可以看到两个平台的交互

5、实验得出的结论

dubbo.properties 会起到默认配置的作用

但是 dubbo-demo-provider.xml 中的配置可以对dubbo.properties 的配置进行覆盖和扩展（这意味着某些配置不是必须的）

dubbo-demo-provider.xml 的内容（DemoTwoServiceImpl.java 和 DemoTwoService.java 是新增的两个类，分别加在dubbo-provider 和 dubbo-api中，参照先例即可）

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<?xml version="1.0" encoding="UTF-8"?>
<!--
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-->
<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-2.5.xsd
http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" />
<bean id="demoTwoService" class="com.alibaba.dubbo.demo.provider.DemoTwoServiceImpl" />
<dubbo:service interface="com.alibaba.dubbo.demo.DemoTwoService" ref="demoTwoService" group="dubbodemoregister2"/>
<dubbo:registry id="dubbodemoregister" address="zookeeper://127.0.0.1:2181" protocol="dubbo"/>
<dubbo:registry id="dubbodemoregister2" address="zookeeper://127.0.0.1:2181" protocol="dubbo"/>
<dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" group="dubbodemoregister"/>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<!--- Copyright 1999-2011 Alibaba Group.-  - Licensed under the Apache License, Version 2.0 (the "License");- you may not use this file except in compliance with the License.- You may obtain a copy of the License at-  -      http://www.apache.org/licenses/LICENSE-2.0-  - Unless required by applicable law or agreed to in writing, software- distributed under the License is distributed on an "AS IS" BASIS,- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.- See the License for the specific language governing permissions and- limitations under the License.
-->
<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-2.5.xsdhttp://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"><!-- bean的声明和Spring无差异 --><bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" /><bean id="demoTwoService" class="com.alibaba.dubbo.demo.provider.DemoTwoServiceImpl" /><!-- 由于dubbo.propertirs 的存在，可以直接配置 <dubbo:service>对外暴露服务,即存在默认的配置， --><dubbo:service interface="com.alibaba.dubbo.demo.DemoTwoService" ref="demoTwoService" group="dubbodemoregister2"/><!-- 如果需要使用个性化配置，则需要单独配置，比如服务提供者协议配置、注册中心配置 、服务提供者缺省值配置--><!-- 服务提供者协议配置-dubbo会覆盖dubbo.properties： --><!-- <dubbo:protocol id="dubbodemo" name="dubbo" port="20882"/> --><!-- 注册中心配置-会覆盖 dubbo.proerties，这个本质就是 dubbo:service的group： --><dubbo:registry id="dubbodemoregister" address="zookeeper://127.0.0.1:2181" protocol="dubbo"/><dubbo:registry id="dubbodemoregister2" address="zookeeper://127.0.0.1:2181" protocol="dubbo"/><!-- 服务提供者缺省值配置-所有服务提供者自动拥有此配置-这意味着，这个配置一个就够了： --><!-- <dubbo:provider id="dubbodemoprovider" group="dubbodemoregister" timeout="30000" retries="0"/> --><!-- 服务提供者暴露服务配置： --><dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" group="dubbodemoregister"/> </beans>