简单几步使用最新版本的DUBBO构建你的微服务体系

NACOS注册中心

• 从github下载最新版本的nacos
• 上传至服务器并解压
• 单机启动sh startup.sh -m standalone
• nacos 控制台访问地址http://192.168.136.129:8848/nacos,使用账号nacos/nacos登录并访问
  
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项目框架

本次案例包含三个组件

• 公共接口层 dubbo-api
• 生产者 dubbo-provider
• 消费者 dubbo-consumer
  代码目录如下：
  
  image

父目录

父目录主要是定义公共组件依赖，版本号，pom文件如下

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <packaging>pom</packaging>

    <modules>
        <module>dubbo-api</module>
        <module>dubbo-provider</module>
        <module>dubbo-consumer</module>
    </modules>

    <groupId>com.jianzh5</groupId>
    <artifactId>dubbo-demo</artifactId>
    <version>1.0-SNAPSHOT</version>


    <properties>
        <java.version>1.8</java.version>
        <netty-all.version>4.0.35.Final</netty-all.version>
        <spring-boot.version>2.1.9.RELEASE</spring-boot.version>
        <dubbo.version>2.7.3</dubbo.version>
        <nacos-client.version>1.1.4</nacos-client.version>
    </properties>


    <dependencyManagement>
        <dependencies>
            <!--SpringBoot-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- Apache Dubbo  -->
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-dependencies-bom</artifactId>
                <version>${dubbo.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- Dubbo Registry Nacos -->
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-registry-nacos</artifactId>
                <version>${dubbo.version}</version>
            </dependency>

            <dependency>
                <groupId>com.alibaba.nacos</groupId>
                <artifactId>nacos-client</artifactId>
                <version>${nacos-client.version}</version>
            </dependency>


            <!-- Dubbo Spring Boot Starter -->
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-spring-boot-starter</artifactId>
                <version>${dubbo.version}</version>
            </dependency>

            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo</artifactId>
                <version>${dubbo.version}</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework</groupId>
                        <artifactId>spring</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>javax.servlet</groupId>
                        <artifactId>servlet-api</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

            <!--接口-->
            <dependency>
                <groupId>com.jianzh5</groupId>
                <artifactId>dubbo-api</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>

        </dependencies>
    </dependencyManagement>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

在pom文件中直接依赖接口，这样生产者和消费者都可以使用了

接口层dubbo-api定义

• pom

<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>
        <artifactId>dubbo-demo</artifactId>
        <groupId>com.jianzh5</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.jianzh5</groupId>
    <artifactId>dubbo-api</artifactId>
    <packaging>jar</packaging>
</project>

• 定义真实的接口

/**
 * @author jianzh5
 * @date 2019/11/5 10:45
 */
public interface HelloService {
    String sayHello();
}

生产者dubbo-provider

• pom

<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>
        <artifactId>dubbo-demo</artifactId>
        <groupId>com.jianzh5</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jianzh5</groupId>
    <artifactId>dubbo-provider</artifactId>

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

        <!-- Dubbo -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>

        <!-- Dubbo Registry Nacos -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
        </dependency>


        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
        </dependency>

        <dependency>
            <groupId>com.jianzh5</groupId>
            <artifactId>dubbo-api</artifactId>
        </dependency>
    </dependencies>

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

• 配置文件application.xml

dubbo.application.name = dubbo-provider
dubbo.registry.address = nacos://192.168.136.129:8848
dubbo.scan.base-packages=com.jianzh5.provider.service.impl
dubbo.protocol.port=20881
dubbo.protocol.name=dubbo

• 接口实现

@Service
public class HelloServiceImpl implements HelloService {

    public String sayHello() {
        return "欢迎关注微信公众号：JAVA日知录";
    }

}

注意这里的@service引用的是org.apache.dubbo.config.annotation.Service,不要引用错了

• 启动类

@SpringBootApplication
@EnableDubbo
public class PrivoderBootstrap {
    public static void main(String[] args) {
        SpringApplication.run(PrivoderBootstrap.class, args);
    }
}

需要引入@EnableDubbo注解

消费者dubbo-consumer

• pom

<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>
        <artifactId>dubbo-demo</artifactId>
        <groupId>com.jianzh5</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jianzh5</groupId>
    <artifactId>dubbo-consumer</artifactId>

    <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>
        </dependency>

        <!-- Dubbo -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>

        <!-- Dubbo Registry Nacos -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
        </dependency>


        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
        </dependency>

        <dependency>
            <groupId>com.jianzh5</groupId>
            <artifactId>dubbo-api</artifactId>
        </dependency>
    </dependencies>


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

</project>

• 配置文件application.properties

spring.application.name=dubbo-consumer
dubbo.registry.address = nacos://192.168.136.129:8848
server.port=9090

• 消费者HelloController

/**
 * @author jianzh5
 * @date 2019/11/5 11:29
 */
@RestController
public class HelloController {

    @Reference
    private HelloService helloService;

    @GetMapping("/sayHello")
    public String sayHello(){
        return helloService.sayHello();
    }

}

使用@Reference注解注入HelloService

• 接口启动类

@SpringBootApplication
public class ConsumerBootstrap {

    public static void main(String[] args) {
        SpringApplication.run(ConsumerBootstrap.class, args);
    }

}

项目启动

• 启动生产者 dubbo-provider

• 启动消费者 dubbo-consumer

• 查看nacos控制台，观察是否注册

  
  
  image

• 访问浏览器http://localhost:9090/sayHello查看接口返回
  

  image

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