springboot-zookeeper-dubbo 整合

springboot-zookeeper-dubbo

1. 建議maven項目，pom.xml加上相應依賴

   <parent>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-parent</artifactId>
           <version>2.3.3.RELEASE</version>
           <relativePath/> <!-- lookup parent from repository -->
       </parent>
   	<properties>
           <java.version>1.8</java.version>
       </properties>
       <dependencies>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
               <scope>compile</scope>
           </dependency>
           <!-- dubbo 相關依賴 -->
           <dependency>
               <groupId>org.apache.dubbo</groupId>
               <artifactId>dubbo-spring-boot-starter</artifactId>
               <version>2.7.8</version>
           </dependency>
           <dependency>
               <groupId>org.apache.curator</groupId>
               <artifactId>curator-recipes</artifactId>
               <version>2.13.0</version>
           </dependency>
           <dependency>
               <groupId>org.apache.zookeeper</groupId>
               <artifactId>zookeeper</artifactId>
               <version>3.4.13</version>
               <type>pom</type>
           </dependency>
       </dependencies>
              

2. 建立一個Module 專門存放Consumer和provider 公用元素，可取名xxx-base模闆，存放共同的接口和工具類等
3. 建立Consumer對應的Module和Provider對應的Module，兩者都引用base Module

   <dependencies>
           <dependency>
               <groupId>com.baoyong</groupId>
               <artifactId>dubbo-base</artifactId>
               <version>${project.parent.version}</version>
           </dependency>
       </dependencies>
              

4. 安裝zookeeper，下載下傳個壓縮包本地解壓修改一下conf/zoo.cfg即可，啟動zk；
   1. 消費者 application配置：

      #Dubbo configuration
      dubbo.application.name=dubbo_consumer
      dubbo.registry.protocol=zookeeper
      dubbo.registry.address=zookeeper://127.0.0.1:2181
      # 注解中引用此版本，之後消費者可通過配置該參數實作動态切換引用的生産者
      dubbo.provider.version=2.0
                 

   2. 生産者application配置：

      ## dubbo 配置
      dubbo.application.name=dubbo_provider
      dubbo.registry.protocol=zookeeper
      dubbo.registry.address=zookeeper://127.0.0.1:2181
      dubbo.protocol.name=dubbo
      dubbo.protocol.port=20880
      # 掃描注解包通過該設定将服務注冊到zookeeper
      dubbo.scan.base-packages=com.baoyong.provider.service.impl
                 

5. 接口實作及調用：
   1. 在base的項目中定義接口 如 TestService。
   2. 在provider項目中實作base定義的接口，TestServiceImpl，注意引用注解：

      @DubboService(interfaceClass = TestService.class, interfaceName = "testServiceImplProvider", version = "${dubbo.provider.version}")
      public class TestServiceImpl implements TestService {
      	...
      }
                 

      此處的實作類在bean容器中的id為 testServiceImpl
   3. 在consumer項目中引用provider的服務：

      @DubboReference(version = "${dubbo.provider.version}")
      private com.baoyong.base.service.TestService testService;
                 

6. 可配置不同version的provider，然後修改consumer調用provider的version即可切換不同版本調用。