dubbo客戶端版本選擇

dubbo 2.5.x 及 2.5.x以前的版本，用zkclient操作zookeeper

pom.xml配置：

<dependency>
????<groupId>com.alibaba</groupId>
????<artifactId>dubbo</artifactId>
????<version>2.5.6</version>
</dependency>
<!--?zkclient?-->
<dependency>
????<groupId>com.101tec</groupId>
????<artifactId>zkclient</artifactId>
????<version>0.10</version>
</dependency>

applicationContext.xml文件頭配置：（注意命名空間）

<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-4.3.xsd?
????http://code.alibabatech.com/schema/dubbo?http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

dubbo 2.6.x及以后的版本，用curator操作zookeeper

pom.xml配置：

<dependency>
????<groupId>com.alibaba</groupId>
????<artifactId>dubbo</artifactId>
????<version>2.6.2</version>
</dependency>
<!--?curator?-->
<dependency>
????<groupId>org.apache.curator</groupId>
????<artifactId>curator-framework</artifactId>
????<version>2.12.0</version>
</dependency>

applicationContext.xml文件頭配置：（注意命名空間）

<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">

注：2.6.x以后集成spring，命名空間也要修改，否則會有如下異常：

Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]