Dubbo Spring Cloud

1、Dubbo Spring Cloud 概述

Spring Cloud 为Java环境中解决微服务问题提供了非常完整的方案，所以在最近几年时间，Spring Cloud成了很多公司首选的技术方案。但是随着运用规模的扩大，Spring Cloud在服务治理领域局限性逐步显露出来。相对来说，在服务治理方面，Apache Dubbo有着非常大的优势，并且在Spring Cloud出现之前，它就已经被很多公司作为服务治理及微服务基础设施的首选框架。

Dubbo Spring Cloud 的出现，使Dubbo既能够完全整合到Spring Cloud的技术栈中，享受Spring Cloud生态中的技术支持和标准化输出，又能够弥补Spring Cloud中服务治理这方面的短板。

2、使用Dubbo Spring Cloud实现服务提供者和服务消费者

2.1、实现Dubbo服务提供方

步骤：

1、添加一个普通Maven工程

<packaging>pom</packaging>
    <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-cloud.version>Greenwich.SR2</spring-cloud.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.11.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <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>

2、创建两个模块:spring-cloud-dubbo-api(普通工程)和spring-cloud-dubbo-provider(spring cloud工程）

3、在spring-cloud-dubbo-api，添加依赖

    <parent>
        <artifactId>spring-dubbo</artifactId>
        <groupId>com.tyschool</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>spring-dubbo-api</artifactId>
    <properties>
        <java.version>1.8</java.version>
    </properties>

4、声明接口

public interface IHelloService {

    String sayHello(String name);
}

5、安装至本地仓库

6、添加服务提供者工程，添加依赖

		<parent>
        <groupId>com.tyschool</groupId>
        <artifactId>spring-dubbo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>com.tyschool</groupId>
            <artifactId>sample-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
    </dependencies>

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

7、修改application.properties

spring.application.name=springclouddubboprovider
dubbo.protocol.id=dubbo
# 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
spring.cloud.zookeeper.discovery.register=true
spring.cloud.zookeeper.connect-string=localhost:2181

8、添加服务类

@Service
public class HelloServiceImpl implements IHelloService {

    @Value("${spring.application.name}")
    private String serviceName;
    @Override
    public String sayHello(String s) {
        return serviceName;
    }
}

2.2 实现Dubbo服务消费者

步骤：

1、添加消费者工程，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>
        <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
            <version>2.1.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <version>2.1.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.tyschool</groupId>
            <artifactId>sample-api</artifactId>
            <version>1.0-SNAPSHOT</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>

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

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

2、添加application.properties

spring.application.name=spring-cloud-dubbo-consumer
spring.cloud.zookeeper.discovery.register=false
spring.cloud.zookeeper.connect-string=localhost:2181
server.port=8097

3、添加启动类

@SpringBootApplication
public class SpirngCloudDubboApplication {

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

4、添加测试Controller

@RestController
public class HelloController {

    @Reference
    private IHelloService helloService;

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