SpringBoot集成Apache Dubbo

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1.Apache Dubbo 的前身 -Dubbo

Dubbo 是阿里巴巴内部使用的一个分布式服务治理框架, 于 2012 年开源。

2018 年 2 月份,Dubbo 进入 Apache 孵化,2019 年 5 月,Apache Dubbo 框架正式从孵化器中毕业, 代表着 Apache Dubbo 正式成为 Apache 的顶级项目

2.Apache Dubbo 概述

Apache Dubbo 是一个分布式服务框架, 主要实现多个系统之间的高性能、透明化调用, 简单来说它是一个 RPC 框架，但是和普通的 RPC 框架不同的是, 它提供了服务治理功能, 比如服务注册、监控、路由、容错等。

3.Spring Boot 集成 Apache Dubbo

3.1 开发服务提供者

步骤：

1. 创建一个普通的 Maven 工程 springboot-provider

2. 添加依赖

		
		<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring-boot.version>2.2.2.RELEASE</spring-boot.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

2. 添加子模块 sample-api

3. 添加依赖

		<parent>
        <groupId>com.tyschool</groupId>
        <artifactId>springboot-provider</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
		<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-site-plugin</artifactId>
                    <version>3.7.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-project-info-reports-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

4. 在子模块 sample-api 中添加接口 IHelloService

public interface IHelloService {String sayHello(String name);
}

5. 将 sample-api 安装到本地仓库

6. 添加子模块 sample-provider, 此模块为 springboot 工程

7. 添加依赖

		<parent>
        <groupId>com.tyschool</groupId>
        <artifactId>springboot-provider</artifactId>
        <version>1.0-SNAPSHOT</version>
    </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.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.5</version>
        </dependency>
        <dependency>
            <groupId>com.tyschool</groupId>
            <version>1.0-SNAPSHOT</version>
            <artifactId>sample-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.5.3-beta</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

8. 添加 HelloServiceImpl

@Service
public class HelloServiceImpl implements IHelloService {@Value("${spring.application.name}")
    private String serviceName;
    @Override
    public String sayHello(String name) {return serviceName;
    }
}

9. 添加配置信息

spring.application.name=sample-provider
#提供方应用信息
dubbo.application.name=springboot-provider
# Dubbo 服务暴露的协议配置，其中子属性 name 为协议名称，port 为协议端口（-1 表示自增端口，从 20880 开始）dubbo.protocol.name=dubbo
dubbo.protocol.port=20880
# 服务注册中心的地址,N/ A 表示不注册
dubbo.registry.address=N/A

10. 修改启动类

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

}

3.2 开发服务消费者

步骤：

1. 创建 springboot 工程：springboot-consumer

2. 添加依赖

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.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>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.5</version>
        </dependency>
        <dependency>
            <groupId>com.tyschool</groupId>
            <version>1.0-SNAPSHOT</version>
            <artifactId>sample-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

3. 添加 controller, 调用服务提供者

@RestController
public class HelloController {@Reference(url = "dubbo://localhost:20880/com.tyschool.service.IHelloService")
    private IHelloService helloService;

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

4. 添加配置

spring.application.name=springboot-consumer
# dubbo 服务扫描基础包路径
dubbo.scan.base-packages=com.tyschool
dubbo.application.name=springboot-consumer

3.3 测试

步骤：

1. 启动服务提供者

2. 启动服务调用者

3. 访问服务调用者的 controller