SpringBoot集成Apache Dubbo

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