Zookeeper+Dubbo+SpringMVC环境搭建

项目码云GIT地址：https://gitee.com/xshuai/dubbo/

开发工具	MyEclipse 10.7
JDK	1.7
容器	Tomcat 8(运行dubbo)
zookeeper版本	zookeeper-3.4.6
dubbo	dubbo-admin-2.5.3

dubbo-admin-2.5.3下载地址：http://pan.baidu.com/s/1bozCMzP

zookeeper下载地址：http://www-eu.apache.org/dist/zookeeper/zookeeper-3.4.6/

• Dubbo+Zookeeper 的下载安装配置启动

1.dubbo-admin-2.5.3下载完成后。放在webapps文件夹下面。先把默认的tomcat的ROOT项目备份后移除。将dubbo-admin-2.5.3.war改成ROOT.war 备用

2.zookeeper下载后解压安装即可。windows安装完成后如下图

进入到conf里面，会看到zoo_sample.cfg文件。复制一个修改为zoo.cfg，修改相关配置内容

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/tmp/zookeeper
# the port at which the clients will connect
#这块是设置zookeeper的端口。默认2181
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

到bin文件夹下面。启动zookeeper，windows 点击zkServer.cmd即可，启动成功如下图

3.可以启动tomcat了。这样直接访问 就能看到dubbo的页面。要不然dubbo启动会报错。第一次入门的话建议就用默认的端口配置即可。默认用户 root 密码 root

登录成功以后看到如下页面

以上就是dubbo+zookeeper的配置和启动。下面开始Java代码的编写

• 整合Dubbo+Zookeeper+SpringMVC

1.创建myDubbo项目为主项目，结构图如下 myC P S后续才创建，刚开始是没有的。

POM.XML配置如下

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com</groupId>
  <artifactId>mydubbo</artifactId>
  注意这里。打包为POM，分布式系统的第一步
  <packaging>pom</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>mydubbo</name>
  <url>http://maven.apache.org</url>
   <properties>
        <spring.version>3.2.4.RELEASE</spring.version>
    </properties>
  <dependencies>
            <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--dubbo注册中心-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!--zookeeper客户端-->
        <dependency>
            <groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>0.1</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency></dependencies><build><finalName>mydubbo</finalName></build>
  创建子项目后自动会加载。刚开始是没有的
  <modules><module>myService</module><module>myProvider</module><module>myConsumer</module></modules></project>

2.创建服务提供商子项目，MyEclipse操作如下图示意 对mydubbo项目鼠标右键new或者maven插件直接创建maven module项目，填写子项目名称。有的如果不选种Create a simple project 自定义创建会报错。选择则不会。根据实际情况来确定是否选择

3.创建3个子项目分别为 myService(服务商(接口)，模块提供方) myProvider(供应者，给dubbo zookeeper注册暴露接口) myConsumer

• myService 项目相关配置

1. pom配置

   <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>
     <parent>
       <artifactId>mydubbo</artifactId>
       <groupId>com</groupId>
       <version>0.0.1-SNAPSHOT</version>
     </parent>
     <name>myService</name>
     <artifactId>myService</artifactId>
     <packaging>jar</packaging>
   </project>

2. 新建一个接口类

   package com.xiaoshuai;
   
   public interface HelloService {
   	public String speakHello(String name);
   }

3. 以上工作完成后，进行maven install

• myProvider项目相关配置

1. pom配置

   <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>
     <parent>
       <artifactId>mydubbo</artifactId>
       <groupId>com</groupId>
       <version>0.0.1-SNAPSHOT</version>
     </parent>
     <artifactId>myProvider</artifactId>
   引用接口服务项目 子项目maven install 为jar
   	<dependencies>
   		<dependency>
   			<groupId>com</groupId>
   			<artifactId>myService</artifactId>
   			<version>0.0.1-SNAPSHOT</version>
   		</dependency>
   	</dependencies>
   </project>

2. 实现接口服务者

   package com.xiaoshuai.impl;
   
   import com.xiaoshuai.HelloService;
   public class HelloServiceImpl implements HelloService{
   
   	public String speakHello(String name) {
   		return "你好:"+name+"欢迎查阅小帅丶博客";
   	}
   
   }
   

3. 将实现类接口类暴露给dubbo+zookeeper 在myProvider创建provider.xml 内容如下

   <?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">  
   
       <!-- 提供方应用信息，用于计算依赖关系 -->
       <dubbo:application name="hello-provider"  />  
   
       <!-- 使用multicast广播注册中心暴露服务地址 -->
       <dubbo:registry address="zookeeper://127.0.0.1:2181" />  
   
       <!-- 用dubbo协议在20880端口暴露服务 -->
       <dubbo:protocol name="dubbo" port="20880" />  
   
       <!-- 声明需要暴露的服务接口 -->
       <dubbo:service interface="com.xiaoshuai.HelloService" ref="helloService" />  
   
       <!-- 和本地bean一样实现服务 -->
       <bean id="helloService" class="com.xiaoshuai.impl.HelloServiceImpl" />  
   
   </beans>
   

4. 需要创建一个Java类写个方法 去 加载provider.xml 注册到dubbo + zookeeper

   package com.xiaoshuai.impl;
   import org.springframework.context.support.ClassPathXmlApplicationContext;
   
   public class ProviderServer {
   	public static void main(String[] args){
   		try {
   			ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
   			context.start();
   			System.in.read();
   		} catch (Exception e) {
   			e.printStackTrace();
   		}
   	}
   }
   

5. 可以运行。启动该提供者服务，编写消费者。

6. 可以看到dubbo 提供者服务已经注册

• myConsumer 项目相关配置

1. pom配置

   <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>
     <parent>
       <artifactId>mydubbo</artifactId>
       <groupId>com</groupId>
       <version>0.0.1-SNAPSHOT</version>
     </parent>
     <artifactId>myConsumer</artifactId>
   	<dependencies>
   		<dependency>
   			<groupId>com</groupId>
   			<artifactId>myService</artifactId>
   			<version>0.0.1-SNAPSHOT</version>
   		</dependency>
   	</dependencies>
   </project>

2. 消费者进行订阅provider的服务，也就是需要去zookeeper读取加载服务，那就需要创建一个consumer.xml去加载zookeeper

   <?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">
   	<!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->
   	<dubbo:application name="hello-consumer" />
   	<!-- 使用multicast广播注册中心暴露发现服务地址 -->
   	<dubbo:registry address="zookeeper://127.0.0.1:2181" />
   	<!-- 生成远程服务代理，可以和本地bean一样使用demoService -->
   	<dubbo:reference id="helloService" interface="com.xiaoshuai.HelloService" />
   </beans>
   

3. 创建一个消费者方法，进行调用ConsumerClient

   package com.xiaoshuai;
   
   import org.springframework.context.support.ClassPathXmlApplicationContext;
   
   public class ConsumerClient {
   	public static void main(String[] args) {
   		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("consumer.xml");
   		HelloService helloService = (HelloService) context.getBean("helloService");
   		String result = helloService.speakHello("xiaoshuai");
   		System.out.println(result);
   	}
   }
   

4. 运行该方法输出一下内容

5. 接下来看dubbo中心有什么内容。

6. 看看消费者里面显示些什么内容

7. 详细消费者信息如图所示

• 以上一个简单的分布式的Demo就已经完结