spingboot2整合dubbo

一、引入依赖（Dubbo 如今已被阿里卖给 Apache 维护和管理，所以最好是引入apache下面的包，网上七七八八的包一大堆，着实让人眼花缭乱，什么com.alibaba.boot，com.alibaba.spring.boot，io.dubbo.springboot等，都快看吐了）

<!--dubbo-springBoot依赖-->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.8</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>4.0.1</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>4.0.1</version>
        </dependency>
    </dependencies>

注：之前引入的ort.apache.curator相关的包是2.12.0版本，但是启动会报java.lang.NoClassDefFoundError:org/apache/curator/framework/recipes/cache/TreeCacheListener的错误，把版本改成4.0.1之后就不会了，试了各种版本，坑的一批

二、服务提供者

1、application.yml配置

dubbo:
  application:
    name: sys-server
  protocol:
    name: dubbo
    port: 20880
  registry:
    address: zookeeper://xxxx:12181
  scan:
    base-packages: com.sys.server.service

其中dubbo.scan.base-packages可以用@EnableDubbo(scanBasePackages = "com.sys.server.service")代替，二者选其一

2、创建服务类，用@DubboService注解表明该类为服务提供者（低版本用@Service）

import com.sys.server.inteface.common.ISystemCommonRpcService;
import org.apache.dubbo.config.annotation.DubboService;
import org.springframework.stereotype.Component;

/**
 * SystemCommonRpcServiceImpl
 *
 * @author admin
 * @date 2021-12-10 14:41
 */
@Component
@DubboService(interfaceName = "systemCommonRpcServiceImpl", version = "1.0.0")
public class SystemCommonRpcServiceImpl implements ISystemCommonRpcService {

    @Override
    public String getSystemInfo() {
        return "获取系统信息";
    }
}

3、创建调用接口

@RestController
@RequestMapping("/webapi")
public class CmServerBusiController {

    @Autowired
    private ICmServerBusiService cmServerBusiService;

    @GetMapping("/select")
    public String selectDataInfo() {
        Map<String, Object> result = cmServerBusiService.selectDataInfo();
        return JSONUtil.toJsonStr(result);
    }
}

三、服务消费者

1、application.yml配置文件

dubbo:
  application:
    name: cm-server
  protocol:
    name: dubbo
    port: 20880
  registry:
    address: zookeeper://xxxx:12181
  scan:
    base-packages: com.cm.server.service

注：消费者如果只是消费，可不用配置dubbo.scan.base-packages

2、调用方（ @DubboReference注入需要调用的服务，低版本用@Reference）

Slf4j
@Service
public class CmServerBusiServiceImpl implements ICmServerBusiService {

    @Autowired
    private CmServerBusiMapper cmServerBusiMapper;

    @DubboReference(version = "1.0.0")
    private ISystemCommonRpcService systemCommonRpcService;

    @Autowired
    private RedisUtil redisUtil;

    @Override
    @ReadDataSource
    public Map<String, Object> selectDataInfo() {
        log.info("============日志打印");
        Map<String, Object> map = cmServerBusiMapper.selectDataInfo();
        String str = systemCommonRpcService.getSystemInfo();
        map.put("system", str);
        return map;
    }
}

四、测试