Springboot 集成 Dubbo，注解方式

Springboot 项目也可以使用 Dubbo 了，方式比较简单，mark 下。

这里我们新建一个maven项目，然后下面对应建provider、consumer、api三个模块。

一、引入依赖

my-dubbo父项目中，我们加入dubbo的公共依赖，

    <dependencies>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.6</version>
            <type>pom</type>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.11</version>
        </dependency>
    </dependencies>

题外话，没有maven私服的话，也可以使用阿里云的maven库，比国外官网的快很多，

    <!-- 设定主仓库，按设定顺序进行查找。 -->
    <repositories>
        <repository>
            <id>aliyun</id>
            <name>aliyun Repository</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
    <!-- 设定插件仓库 -->
    <pluginRepositories>
        <pluginRepository>
            <id>aliyunplugin</id>
            <name>aliyunplugin Repository</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </pluginRepository>
    </pluginRepositories>

二、provider 配置

1、在启动类上，加上 @EnableDubboConfig 注解，

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

2、springboot项目yml配置文件中的dubbo配置，

server:
  port: 8081
spring:
  application:
    name: provider
  dubbo:
    appname: provider
    registry: zookeeper://127.0.0.1:2181
    protocol: dubbo
    port: 20880

3、在写接口实现类的时候，注意两个@Service注解（springboot的@Service注解和dubbo的@Service注解同名）的引用，一个用全称。

import com.spf.dubbo.demoapi.service.IBookService;
import org.apache.dubbo.config.annotation.Service;

@org.springframework.stereotype.Service
@Service(interfaceClass = IBookService.class, loadbalance = "roundrobin", weight = 60,
        cluster = "failover", retries = 3, version = "1.0")
public class BookServiceImpl implements IBookService {

    @Override
    public String sayHello() {
        return "Hello World";
    }
}

三、consumer 配置

1、在启动类上，加上 @EnableDubboConfig 注解，

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

2、springboot项目yml配置文件中的dubbo配置，

server:
  port: 9091
spring:
  application:
    name: consumer
  dubbo:
    appname: consumer
    registry: zookeeper://127.0.0.1:2181
    protocal: dubbo
    port: 20880

3、消费者使用@Reference引用服务，

import com.spf.dubbo.demoapi.service.IBookService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Service;

@Service
public class DubboService {

    @Reference(interfaceClass = IBookService.class, loadbalance = "random", cluster = "failover",retries = 3, version = "1.0")
    IBookService bookService;

    public String test(){
        return bookService.sayHello();
    }
}

四、启动

这里使用zookeeper作为注册中心，记得首先启动zk，然后provider、consumer。