ZooKeeper+Dubbo+SpringBoot 微服务Demo搭建

　1、　首先创建springBoot项目，springBoot是一堆组件的集合，在pom文件中对需要的组件进行配置。生成如下目录结构

　　　　

　　　　创建test项目，同步在test创建dubbo-api,dubbo-consume,dubbo-provider三个Model

　　　　dubbo-provider 为服务的提供者，服务的实现层

　　　　dubbo-api 为服务提供者dubbo-provider的接口层 （此处dubbo-provider,dubbo-api相当于一个微服务，dubbo-api为对外接口，由消费者dubbo-consume调用）

　　　　dubbo-consume 为服务的消费者，消费由dubbo-api提供的服务

2、配置pom.xml

　　test中的pom.xml是其他三个Module的父文件，所以公共的部分在test中配置即可。

　　test 中 pom.xml部分配置　　

 <modules>
         <module>dubbo-provider</module>
         <module>dubbo-consume</module>
         <module>dubbo-api</module>
     </modules>
 <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.0.3.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
         <com.alibaba.dubbo.version>2.5.3</com.alibaba.dubbo.version>
         <org.apache.zookeeper.version>3.4.12</org.apache.zookeeper.version>
         <com.github.sgroschupf.zkclient.version>0.1</com.github.sgroschupf.zkclient.version>
     </properties>
 <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

pom.xml

　　dubbo-api中pom.xml

  <parent>
         <artifactId>test</artifactId>
         <groupId>com.example</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>

     <artifactId>dubbo-api</artifactId>
     <packaging>jar</packaging>
     <name>dubbo-api</name>
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
     </dependencies>
     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

pom.xml

　　dubbo-provider中pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <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>test</artifactId>
         <groupId>com.example</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>

     <artifactId>dubbo-provider</artifactId>
     <packaging>jar</packaging>
     <name>dubbo-provide</name>
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter</artifactId>
         </dependency>
         <dependency>
             <groupId>com.example</groupId>
             <artifactId>dubbo-api</artifactId>
             <version>0.0.1-SNAPSHOT</version>
         </dependency>
         <!-- dubbo -->
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>dubbo</artifactId>
             <exclusions>
                 <exclusion>
                     <groupId>org.springframework</groupId>
                     <artifactId>spring</artifactId>
                 </exclusion>
             </exclusions>
             <version>${com.alibaba.dubbo.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.zookeeper</groupId>
             <artifactId>zookeeper</artifactId>
             <version>${org.apache.zookeeper.version}</version>
         </dependency>
         <dependency>
             <groupId>com.github.sgroschupf</groupId>
             <artifactId>zkclient</artifactId>
             <version>${com.github.sgroschupf.zkclient.version}</version>
         </dependency>
     </dependencies>
     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>
 </project>

pom.xml

　　dubbo-consume中pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <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>test</artifactId>
         <groupId>com.example</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>

     <artifactId>dubbo-consume</artifactId>
      <name>dubbo-consume</name>
     <packaging>jar</packaging>
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>com.example</groupId>
             <artifactId>dubbo-api</artifactId>
             <version>0.0.1-SNAPSHOT</version>
         </dependency>
         <!-- dubbo -->
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>dubbo</artifactId>
             <exclusions>
                 <exclusion>
                     <groupId>org.springframework</groupId>
                     <artifactId>spring</artifactId>
                 </exclusion>
             </exclusions>
             <version>${com.alibaba.dubbo.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.zookeeper</groupId>
             <artifactId>zookeeper</artifactId>
             <version>${org.apache.zookeeper.version}</version>
         </dependency>
         <dependency>
             <groupId>com.github.sgroschupf</groupId>
             <artifactId>zkclient</artifactId>
             <version>${com.github.sgroschupf.zkclient.version}</version>
         </dependency>
     </dependencies>
     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>
 </project>

pom.xml

3、dubbo-api　　

　　

　　定义接口IDubboDemoService

public interface IDubboDemoService {

    public String getString();
}

4、dubbo-provider

首先创建启动类，和dubbo配置文件启动类，mainConfig项目启动类就不多说了

@Configuration
@PropertySource("classpath:dubbo-provider.properties")
@ImportResource({ "classpath:dubbo-provider.xml" })
public class DubboConfig {
}

DubboConfig.java

dubbo读取的两个配置文件

首先对dubbo进行配置

#应用名称
dubbo.application.name=dubbo-provider
#注册中心类型
dubbo.registry.protocol=zookeeper
#注册中心地址
dubbo.registry.address=127.0.0.1:2181
#暴露服务方式
dubbo.protocol.name=dubbo
#暴露服务端口
dubbo.protocol.port=20880

之后对dubbo中的接口进行配置

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

    <!-- 注册中心暴露服务地址 -->
    <!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->

    <!-- <dubbo:registry protocol="zookeeper" address="10.170.219.98:2181,10.173.55.173:2181" /> -->
    <dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address}" />

    <!-- 暴露服务 -->
    <dubbo:protocol name="${dubbo.protocol.name}" port="${dubbo.protocol.port}" />
　　<!-- 暴露的接口 -->
    <dubbo:service interface="com.example.service.IDubboDemoService"
                   ref="dubboDemoServiceImpl" retries="0" timeout="6000" />

</beans>

注意：mainConfig.java和DubboConfg.java 两个文件要放在接口的上一层，否则加载时会找不到接口

　　接口实现：

@Service
public class DubboDemoServiceImpl implements IDubboDemoService {
    @Override
    public String   getString() {
        return "成功";
    }
}

5、dubbo-consume

只来看下配置文件

　　dubbo.consume.properties:消费者只需要知道注册中心的类型和地址

#应用名称
dubbo.application.name=dubbo-consume
#注册中心类型
dubbo.registry.protocol=zookeeper
#注册中心地址
dubbo.registry.address=127.0.0.1:2181

　　dubbo-consume.xml:只需要配置消费方需要引用的接口即可

<?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="${dubbo.application.name}" />

    <!-- 注册中心暴露服务地址 -->
    <!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->

    <!-- <dubbo:registry protocol="zookeeper" address="10.170.219.98:2181,10.173.55.173:2181" /> -->
    <dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address}" />

    <dubbo:reference id="consumeService" interface="com.example.service.IDubboDemoService" />

</beans>

测试代码

　　

 @RestController
 @RequestMapping("/dubbo")
 public class DubboDemoController {

         @Resource
          public IDubboDemoService service;

         @RequestMapping(value = "/getString", method = RequestMethod.GET)
         public String getString(){
             return service.getString();
         }

 }

DubboDemoController.java

到此简单的配置已经ok了。

6、整个流程为 服务的提供者方面 dubbo将对外的服务注册到zooKeeper上，同时在zooKeeper生成相应的node,对其监控。消费方从zooKeeper中去拿服务，所以服务的接口必须到时提供者和消费者约定好的。这样就利用dubbo+zooKeeper实现的远程RPC调用