Spring boot 2.1 + Dubbo 2.7.1 + Zookeeper 3.4.14 Demo 搭建

Zookeeper 安装

• 下载：zookeeper-3.4.14.tar.gz

• 解压

• 配置：
  将 conf/zoo_sample.cfg 复制为 zoo.cfg
  修改 zoo.cfg

  dataDir=D:\\zookeeper-3.4.14\\data
  dataLogDir=D:\\zookeeper-3.4.14\\log
  

  创建文件夹 data log

• 启动：
  bin/zkServer.cmd
  

Dubbo 样例代码

• 创建项目
  父项目 dubbo-demo 子项目 dubbo-demo-api、dubbo-demo-consumer、dubbo-demo-provider

• 父项目结构
  

• 父项目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">
  
      <parent>
          <groupId>org.springframework.bootgroupId>
          <artifactId>spring-boot-starter-parentartifactId>
          <version>2.1.3.RELEASEversion>
          <relativePath/> 
      parent>
  
      <groupId>org.apache.dubbogroupId>
      <version>1.0-SNAPSHOTversion>
      <modelVersion>4.0.0modelVersion>
      <artifactId>dubbo-demoartifactId>
      <packaging>pompackaging>
  
      <modules>
          <module>dubbo-demo-apimodule>
          <module>dubbo-demo-consumermodule>
          <module>dubbo-demo-providermodule>
      modules>
  
      <properties>
          <java.version>1.8java.version>
          <spring-boot.version>2.1.1.RELEASEspring-boot.version>
          <dubbo.version>2.7.1dubbo.version>
      properties>
  
      <dependencies>
  
          <dependency>
              <groupId>org.springframework.bootgroupId>
              <artifactId>spring-boot-starterartifactId>
          dependency>
  
          <dependency>
              <groupId>org.springframework.bootgroupId>
              <artifactId>spring-boot-starter-webartifactId>
          dependency>
  
          <dependency>
              <groupId>org.springframework.bootgroupId>
              <artifactId>spring-boot-starter-testartifactId>
              <scope>testscope>
          dependency>
  
          <dependency>
              <groupId>org.apache.dubbogroupId>
              <artifactId>dubbo-spring-boot-starterartifactId>
              <version>${dubbo.version}version>
          dependency>
          <dependency>
              <groupId>org.apache.dubbogroupId>
              <artifactId>dubboartifactId>
              <version>${dubbo.version}version>
          dependency>
          <dependency>
              <groupId>org.apache.curatorgroupId>
              <artifactId>curator-recipesartifactId>
              <version>2.7.0version>
          dependency>
  
      dependencies>
  
      <build>
          <plugins>
  
              <plugin>
                  <groupId>org.springframework.bootgroupId>
                  <artifactId>spring-boot-maven-pluginartifactId>
              plugin>
  
          plugins>
      build>
  project>
  

• debbo-demo-api 项目提供接口
  

• debbo-demo-api 项目pom.xml很简单，继承父亲，完全不用其他的

  
  <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">
  
      <parent>
          <groupId>org.apache.dubbogroupId>
          <artifactId>dubbo-demoartifactId>
          <version>1.0-SNAPSHOTversion>
      parent>
  
      <artifactId>dubbo-demo-apiartifactId>
      <packaging>warpackaging>
      <version>1.0-SNAPSHOTversion>
      <modelVersion>4.0.0modelVersion>
  
  project>
  

• dubbo-demo-provider 引入 dubbo-demo-api ，实现接口
  

• 配置文件 application.properties

  # demo-provider配置文件
  
  # 端口配置
  server.port=8081
  
  ## Dubbo 服务提供者配置
  # provider应用名称
  spring.application.name=demo-provider
  
  # Dubbo组件扫描的基础包
  dubbo.scan.base-packages=org.apache.dubbo.demo
  
  dubbo.application.name=dubbo-provider
  
  #注册中心地址
  dubbo.registry.address=zookeeper://192.168.2.101:2181
  
  # Dubbo 协议与端口
  dubbo.protocol.name=dubbo
  dubbo.protocol.port=12345
  

• 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">
  
      <parent>
          <groupId>org.apache.dubbogroupId>
          <artifactId>dubbo-demoartifactId>
          <version>1.0-SNAPSHOTversion>
      parent>
  
      <version>1.0-SNAPSHOTversion>
      <modelVersion>4.0.0modelVersion>
      <artifactId>dubbo-demo-providerartifactId>
  
      <dependencies>
  
          <dependency>
              <groupId>org.apache.dubbogroupId>
              <artifactId>dubbo-demo-apiartifactId>
              <version>1.0-SNAPSHOTversion>
          dependency>
  
      dependencies>
  
  project>
  
  

• spring boot 启动类

  package org.apache.dubbo.demo;
  
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  
  @SpringBootApplication
  public class Application {
  
      public static void main(String[] args) {
          SpringApplication.run(Application.class, args);
      }
  }
  

• dubbo-demo-consumer 作为服务的消费者（方法调用方）引入 dubbo-demo-api ，调用接口

  
  一个普通的Controller

• 配置文件 application.properties\

  # demo-consumer配置文件
  
  #端口配置，为防止端口冲突，该模块端口使用18080
  server.port=18080
  
  dubbo.application.name=dubbo-consumer
  
  #注册中心地址
  dubbo.registry.address=zookeeper://localhost:2181
  
  # 应用名称，配置模块项目名称即可
  spring.application.name=demo-consumer
  

• 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">
  
      <parent>
          <groupId>org.apache.dubbogroupId>
          <artifactId>dubbo-demoartifactId>
          <version>1.0-SNAPSHOTversion>
      parent>
  
      <version>1.0-SNAPSHOTversion>
      <modelVersion>4.0.0modelVersion>
      <artifactId>dubbo-demo-consumerartifactId>
  
      <dependencies>
          <dependency>
              <groupId>org.apache.dubbogroupId>
              <artifactId>dubbo-demo-apiartifactId>
              <version>1.0-SNAPSHOTversion>
          dependency>
      dependencies>
  
  project>
  

• sprint boot 启动类

  package org.apache.dubbo.demo;
  
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  
  @SpringBootApplication
  public class ConsumerApplication {
  
      public static void main(String[] args) {
          SpringApplication.run(ConsumerApplication.class, args);
      }
  }
  

• 先启动 provider，再启动 consumer，可以在zookeeper控制台看见连接的输出
  

• 访问 http://localhost:18080/hello/world 即可看见神奇的结果
  

Dubbo 监控页面

• GitHub 地址 https://github.com/apache/incubator-dubbo-admin

  git clone https://github.com/apache/incubator-dubbo-admin.git
  

• 修改配置文件 dubbo-admin-server/src/main/resources/application.properties

  admin.registry.address=zookeeper://127.0.0.1:2181
  admin.config-center=zookeeper://127.0.0.1:2181
  admin.metadata-report.address=zookeeper://127.0.0.1:2181
  

• 打包

  mvn clean package
  

• 启动

  cd dubbo-admin-distribution/target
  java -jar dubbo-admin-0.1.jar
  

• 访问 localhost:8080，神奇的页面就有了，也能看见我们注册的服务
  

问题与总结

• 父项目的pom的packaging方式为pom
• 我的消费者是个web Controller，所以 consumer 的 pom packaging 方式为 war
• 在父pom里面加上下面的依赖的原因是会报一个少包的异常

  <dependency>
      <groupId>org.apache.curatorgroupId>
      <artifactId>curator-recipesartifactId>
      <version>2.7.0version>
  dependency>
  

• 在provider里面用的 @Service 注解是用的Duddo的注解包，并且指定了version，在调用方法的地方也是需要指定 version 的
• 项目的方式是 zookeeper 的，也可以用其他的，或者采用直连的方式，直连的时候需要在调用service的地方指定 url=
• 在我的controler里面采用的是 @PathVariable 的方式从路径里面获取参数，如果没有 name 的参数，会找不到，我还以为可以映射进来 把 name 映射成 null
• 期待后续将老项目迁移过来