Spring-Boot & Dubbo 整合

为什么要用dubbo

• 服务治理框架
• 服务的监控
• 服务的注册发现
• 服务的通信
• 服务的容错
• 服务的负载均衡

dubbo支持的注册中心

• consul
• zookeeper
• eureka
• redis
• etcd
• nacos
• ....

创建 Demo

创建工程、在工程下创建三个模块、分别是 api、consumer、provider

provider & consumer 的 pom 依赖

<properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-boot.version>2.2.1.RELEASE</spring-boot.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <version>${spring-boot.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo-spring-boot-starter</artifactId>
        <version>2.7.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>${spring-boot.version}</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-dependencies-zookeeper -->
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo-dependencies-zookeeper</artifactId>
        <version>2.7.7</version>
        <type>pom</type>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <version>${spring-boot.version}</version>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.example</groupId>
        <artifactId>api</artifactId>
        <version>1.0-SNAPSHOT</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

先在 api 模块中新增一个接口

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

后续在 provider 模块中实现该接口

@DubboService(version = "1.0.0")
public class DefaultDemoService implements DemoService {
    /**
     * The default value of ${dubbo.application.name} is ${spring.application.name}
     */
    @Value("${dubbo.application.name}")
    private String serviceName;
    public String sayHello(String name) {
        return String.format("[%s] : Hello, %s", serviceName, name);
    }
}

编写 Spring Boot 启动类

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

在 resource 目录下新建 application.properties

spring.application.name=dubbo-auto-configuration-provider-demo
# 服务发布的协议
dubbo.protocol.name=dubbo
# dubbo 接收请求的端口
dubbo.protocol.port=12345
# 注册中心的协议和地址
dubbo.registry.address=zookeeper://127.0.0.1:2181

启动 Zookeeper

./zkServer.sh start
 ./zkServer.sh status

查看 Zookeeper 上面的节点信息

获取并对其进行解码、存储的该接口的一些基本信息

dubbo://127.0.0.1:12345/com.demo.api.DemoService
?anyhost=true
&application=dubbo-auto-configuration-provider-demo
&deprecated=false
&dubbo=2.0.2
&dynamic=true
&generic=false
&interface=com.demo.api.DemoService
&methods=sayHello
&pid=78391
&release=2.7.7
&revision=1.0.0
&side=provider
&timestamp=1642253598103
&version=1.0.0

编写消费端

@SpringBootApplication
public class DubboAutoConfigurationConsumerBootstrap {
    @DubboReference(version = "1.0.0")
    private DemoService demoService;
    public static void main(String[] args) {
        SpringApplication.run(DubboAutoConfigurationConsumerBootstrap.class).close();
    }
    @Bean
    public ApplicationRunner runner() {
        return new ApplicationRunner() {
            public void run(ApplicationArguments args) throws Exception {
                System.out.println(demoService.sayHello("mercyblitz"));
            }
        };
    }
}

配置文件

spring.application.name=dubbo-auto-configure-consumer-sample
server.port=8090
dubbo.registry.address=zookeeper://127.0.0.1:2181

控制台输出

[dubbo-auto-configuration-provider-demo] : Hello, mercyblitz