dubbo中对服务多版本的支持

在dubbo的文档中说：

    当一个接口实现，出现不兼容升级时，可以用版本号过渡，版本号不同的服务相互间不引用。在低压力时间段，先升级一半提供者为新版本再将所有消费者升级为新版本然后将剩下的一半提供者升级为新版本<dubbo:service interface="com.foo.BarService" version="1.0.0" /><dubbo:service interface="com.foo.BarService" version="2.0.0" /><dubbo:reference id="barService" interface="com.foo.BarService" version="1.0.0" /><dubbo:reference id="barService" interface="com.foo.BarService" version="2.0.0" />不区分版本：(2.2.0以上版本支持)<dubbo:reference id="barService" interface="com.foo.BarService" version="*" />
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示例

服务提供方

// 服务接口定义package com.dubbosample.service;public interface IDubbodoSomethingService {      public String doSomething();    }
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// 服务接口实现package com.dubbosample.service.impl;import com.dubbosample.service.IDubbodoSomethingService;public class DubbodoSomething1ServiceImpl implements IDubbodoSomethingService {    @Override    public String doSomething() {                logger.info( "v1 版本");        return "----";    }    }
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// 服务接口实现package com.dubbosample.service.impl; import com.dubbosample.service.IDubbodoSomethingService;public class DubbodoSomething2ServiceImpl implements IDubbodoSomethingService {    @Override    public String doSomething() {         logger.info( "v2 版本");        return "*****";    }}
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下面是spring应用的配置 
applicationContext.xml配置：

<?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">    <!-- 配置Bean -->    <bean id="serviceVersion1" class="com.dubbosample.service.impl.DubbodoSomething1ServiceImpl"/>    <bean id="serviceVersion2" class="com.dubbosample.service.impl.DubbodoSomething2ServiceImpl"/>    <!-- 引入配置文件 -->    <import resource="classpath:dubbo.xml"/> </beans>
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dubbo.xml配置：

<?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">    <!-- 指定web服务名字 -->    <dubbo:application name="DubbodoSomething"/>    <!-- 声明服务注册中心 -->    <dubbo:registry  protocol="zookeeper" address="127.0.0.1:2181"/>    <!-- 指定传输层通信协议 -->    <dubbo:protocol name="dubbo" port="20880"/>    <dubbo:protocol name="rmi" port="1099"/>    <!-- 暴露你的服务地址 -->    <!-- 这里使用了版本配置 version -->    <dubbo:service         ref="serviceVersion1"         interface="com.dubbosample.service.IDubbodoSomethingService"        protocol="dubbo,rmi"        version="1.0.0"    />     <dubbo:service         ref="serviceVersion2"         interface="com.dubbosample.service.IDubbodoSomethingService"        protocol="dubbo,rmi"        version="1.0.1"    /> </beans>
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客户端

// 接口声明package com.dubbosample.service;public interface IDubbodoSomethingService {    public String doSomething();    }
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applicationContext.xml 配置：

<?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">    <!-- 引入配置文件 -->    <import resource="classpath:dubbo.xml"/> </beans>
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dubbo.xml 配置： 
在这里也配置了服务的多个版本实现引用，使用version

 <?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">    <!-- 指定web服务名字 -->    <dubbo:application name="DubbodoSomething"/>    <!-- 声明服务注册中心 -->    <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"/>    <!-- 指定传输层通信协议 -->    <dubbo:protocol name="dubbo" port="20881"/>    <dubbo:protocol name="rmi" port="1010"/>    <!-- 暴露你的服务地址 -->    <dubbo:reference         id="serviceVersion1"         interface="com.dubbosample.service.IDubbodoSomethingService"        protocol="dubbo"        version="1.0.0"    />     <dubbo:reference         id="serviceVersion2"         interface="com.dubbosample.service.IDubbodoSomethingService"        protocol="dubbo"        version="1.0.1"    />    <dubbo:reference         id="serviceVersion3"         interface="com.dubbosample.service.IDubbodoSomethingService"        protocol="dubbo"        version="*"    /> </beans>
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客户端代码

package com.dubbosample.service;import java.io.IOException;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext; public class DubboStart{    public static void main(String[] args) throws IOException {        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");        //访问 v1 版本        IDubbodoSomethingService serviceVersion1=(IDubbodoSomethingService) ctx.getBean("serviceVersion1");        System.out.println(serviceVersion1.doSomething());        //访问 v2 版本        IDubbodoSomethingService serviceVersion2=(IDubbodoSomethingService) ctx.getBean("serviceVersion2");        System.out.println(serviceVersion2.doSomething());        //访问随机版本        IDubbodoSomethingService serviceVersion3=(IDubbodoSomethingService) ctx.getBean("serviceVersion3");        System.out.println(serviceVersion3.doSomething());    }}