基于ZooKeeper的Dubbo简单抽样登记中心

一：设备zookeeper

系统环境

Ubuntu 14.04.2 LTS x64

IP : 192.168.1.102

下载zookeeper-3.4.6.tar.gz到文件夹/opt。拉开拉链

mkdir /opt/zookeeper-3.4.6/data

vim /opt/zookeeper-3.4.6/conf/zoo.cfg

输入例如以下内容

tickTime=2000
dataDir=/opt/zookeeper-3.4.6/data
clientPort=2181

然后。启动 sh /opt/zookeeper-3.4.6/bin/zkServer.sh start

这样，一个简单的单机zookeeper就安装好了

二：编写dubbo代码

这里有三个maven项目

dubbo-service 定义了一个接口，供其它两个项目使用

dubbo-provider提供服务

dubbo-consumer消费服务

dubbo-service代码例如以下：

package com.lala.service;

import java.util.List;
import java.util.Map;

public interface UserService {

	public Map<String, Object> findById(int id);
	
	public List<Map<String, Object>> queryList();
}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.lala</groupId>
	<artifactId>dubbo-service</artifactId>
	<version>1.0.0</version>
	<packaging>jar</packaging>

	<name>dubbo-service</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.10</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<verbose>true</verbose>
				</configuration>
			</plugin>

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-source-plugin</artifactId>
				<version>2.4</version>
				<executions>
					<execution>
						<id>attach-sources</id>
						<phase>verify</phase>
						<goals>
							<goal>jar-no-fork</goal>
						</goals>
					</execution>
				</executions>
			</plugin>

		</plugins>
	</build>
</project>

完毕之后，运行mvn install 安装到本地仓库

dubbo-provider 代码例如以下：

package com.lala.service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class UserServiceImpl implements UserService 
{
	public Map<String, Object> findById(int id) 
	{
		return get(id);
	}

	public List<Map<String, Object>> queryList() 
	{
		List<Map<String, Object>> list = new ArrayList<>();
		for(int i=1;i<=10;i++)
		{
			list.add(get(i));
		}
		return list;
	}

	private Map<String, Object> get(int id)
	{
		Map<String, Object> res = new HashMap<>();
		res.put("id", id);
		res.put("name", "项羽");
		res.put("type", "西楚霸王");
		res.put("date", "公元前232年―公元前202年");
		return res;
	}
}

package com.lala.dubbo;

import java.util.concurrent.TimeUnit;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Hello world!
 *
 */
public class StartServer 
{
    public static void main( String[] args )throws Exception
    {
    	ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(  
    			  new String[]{"application-provider.xml"});  
    	context.start();
    	TimeUnit.HOURS.sleep(1l);
    }
}

application-provider.xml 内容为：

<?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-4.0.xsd 
	   http://code.alibabatech.com/schema/dubbo  
	   http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

	<!-- 提供方应用信息，用于计算依赖关系 -->
	<dubbo:application name="my_provider" />

	<!-- 使用multicast广播注冊中心暴露服务地址 -->
	<dubbo:registry protocol="zookeeper" address="192.168.1.102:2181" />

	<!-- 用dubbo协议在20880端口暴露服务 -->
	<dubbo:protocol name="dubbo" port="20880" />

	<!-- 详细的实现bean -->
	<bean id="userService" class=" com.lala.service.UserServiceImpl" />

	<!-- 声明须要暴露的服务接口 -->
	<dubbo:service interface=" com.lala.service.UserService" ref="userService" />
		
</beans>  

pom.xml 内容为：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.lala</groupId>
	<artifactId>dubbo-Provider</artifactId>
	<version>1.0.0</version>
	<packaging>jar</packaging>

	<name>dubbo-provider</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>com.lala</groupId>
			<artifactId>dubbo-service</artifactId>
			<version>1.0.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.zookeeper</groupId>
			<artifactId>zookeeper</artifactId>
			<version>3.4.6</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.5.3</version>
		</dependency>
		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.5</version>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<verbose>true</verbose>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

然后，运行StartServer.java 启动服务

dubbo-consumer 代码：

application-consumer.xml 内容

<?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-4.0.xsd 
	   http://code.alibabatech.com/schema/dubbo  
	   http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

	<!-- 提供方应用信息，用于计算依赖关系 -->
	<dubbo:application name="my_provider" />

	<!-- 使用multicast广播注冊中心暴露服务地址 -->
	<dubbo:registry address="zookeeper://192.168.1.102:2181" />

	<dubbo:reference id="userService" interface="com.lala.service.UserService" />  
</beans>  

pom.xml 内容

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.lala</groupId>
	<artifactId>dubbo-Consumer</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>dubbo-consumer</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.5.3</version>
		</dependency>
		<dependency>
			<groupId>org.apache.zookeeper</groupId>
			<artifactId>zookeeper</artifactId>
			<version>3.4.6</version>
		</dependency>
		<dependency>
			<groupId>com.github.sgroschupf</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.1</version>
		</dependency>
		<dependency>
			<groupId>com.lala</groupId>
			<artifactId>dubbo-service</artifactId>
			<version>1.0.0</version>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<verbose>true</verbose>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

package com.lala.client;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.lala.service.UserService;

public class Client 
{
	public static void main(String[] args) throws Exception
	{
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(  
  			  new String[]{"application-consumer.xml"});  
		
		UserService us = (UserService)context.getBean("userService");
		System.out.println(us.findById(1));
		
	}
}

最后。运行Client.java 输出结果为：

{date=公元前232年―公元前202年, name=项羽, id=1, type=虞姬}

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