dubbo注册到zookeeper

 zk注册中心安装，参见dubbo官网：http://dubbo.apache.org/books/dubbo-admin-book/install/zookeeper.html

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://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <dubbo:application name="demo-provider"/>
    <!--<dubbo:registry address="multicast://224.5.6.7:1234"/>-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <dubbo:protocol name="dubbo" port="20880" threads="205" threadpool="limited"/>
    <dubbo:service protocol="dubbo" interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" timeout="20000"/>
    <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl"/>
</beans>

Provider程序：

public class Provider {

    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("spring/dubbo-demo-provider.xml");
        context.start();
        System.out.println("started...");
        System.in.read();
    }
}

这时执行程序会有如下异常：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/curator/RetryPolicy
	at com.alibaba.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.connect(CuratorZookeeperTransporter.java:26)
	at com.alibaba.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java)
	at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry.<init>(ZookeeperRegistry.java:69)
	at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistryFactory.createRegistry(ZookeeperRegistryFactory.java:37)
	at com.alibaba.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:95)
	at com.alibaba.dubbo.registry.RegistryFactory$Adaptive.getRegistry(RegistryFactory$Adaptive.java)
	at com.alibaba.dubbo.registry.integration.RegistryProtocol.getRegistry(RegistryProtocol.java:200)
	at com.alibaba.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:134)
	at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:54)
	at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:91)
	at com.alibaba.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:54)
	at com.alibaba.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java)
	at com.alibaba.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:505)
	at com.alibaba.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:357)
	at com.alibaba.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:316)
	at com.alibaba.dubbo.config.ServiceConfig.export(ServiceConfig.java:215)
	at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:121)
	at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:50)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
	at Provider.main(Provider.java:7)
Caused by: java.lang.ClassNotFoundException: org.apache.curator.RetryPolicy
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	... 27 more

上面堆栈里java.lang.NoClassDefFoundError、java.lang.ClassNotFoundException，通常指缺少jar依赖。需增加如下依赖：

        <!-- zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>${zookeeper.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>io.netty</groupId>
                    <artifactId>netty</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>${curator.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>${curator.version}</version>
        </dependency>

jar版本定义：

    <properties>
        <!--<dubbo.version>2.4.11</dubbo.version>-->
        <dubbo.version>2.6.1</dubbo.version>
        <zookeeper.version>3.4.6</zookeeper.version>
        <curator.version>2.8.0</curator.version>
    </properties>

consumer.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">
    <dubbo:application name="demo-consumer"/>
    <!--<dubbo:registry address="multicast://224.5.6.7:1234"/>-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.SubDemoService" timeout="6000"/>
</beans>

同样，consumer端也要依赖以上zookeeper和curator的jar。

dubbo管理端

dubbo管理端安装：https://www.cnblogs.com/xhkj/p/7407092.html

dubbo官网：http://dubbo.apache.org/books/dubbo-admin-book/install/admin-console.html

DOS下cd命令的使用：

cmd窗口里。比如要进入目录：D:Javadubboincubator-dubbo-ops-masterdubbo-admin，首先要执行命令cd d: 到D盘根目录，然后cd D:Javadubboincubator-dubbo-ops-masterdubbo-admin，即可进入目标目录。

ZooKeeper可视化管理工具ZooInspector

下载：https://issues.apache.org/jira/secure/attachment/12436620/ZooInspector.zip 

解压后，在文件夹下创建run.bat，内容为 java -jar zookeeper-dev-ZooInspector.jar （即，通过java -jar的方式启动程序）

运行run.bat，可在打开的GUI里，指定zk服务器地址（zookeeper默认端口是2181）

 然后，就可以看到注册的dubbo服务列表，每个服务下显示注册的消费者节点和生产者节点。

可以删掉某个注册的节点。我们在测试系统时，如果开发环境和测试环境用同一套maven配置，那么，大家的服务会注册到同一个zk上。而在这种情况下，一旦各节点的程序版本不一致，往往就会干扰我们的测试结果。所以，可以通过这个工具来删除某些节点。（当然，隔离开发环境和测试环境的zk是根本解决办法。）

Zookeeper监控管理工具ZkWeb

上面的ZooInspector只能管理节点，没有集群状态监控功能。zkWeb就是这么一个强大的工具。以后有时间再做分享吧。

ref:http://www.cnblogs.com/chanshuyi/p/deep_insight_dubbo_config.html “创建 com.chanshuyi.Launcher.java，用于启动 provider 服务，是启动入口”

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