Dubbo的使用入门

一、包引入

1、父模块pom.xml中加入依赖：

  　　　　<!-- dubbo -->
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.0</version>
        </dependency>

我这里还引入了SpringBoot和一些常用组件 

    <!--Add Spring boot Parent-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <!--SpringBoot核心模块，包括自动配置支持、日志和YAML-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--测试模块，包括JUnit、Hamcrest、Mockito-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <version>2.0.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>
        <!-- JPA操作数据库 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>2.0.4.RELEASE</version>
        </dependency>
        <!-- dubbo -->
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.0</version>
        </dependency>
        <!--Web模块-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.51</version>
        </dependency>
    </dependencies>

2、服务提供者子模块的application.properties中加入下列配置

server.port=8084
spring.application.name=dubbo-provider-users
dubbo.application.name=dubbo-provider-users
dubbo.registry.protocol=zookeeper
dubbo.registry.address=172.16.4.132:2181|172.16.4.131:2181|172.16.4.133:2181
dubbo.protocol.name=dubbo
dubbo.protocol.port=20884
dubbo.scan.base-packages=com.test.usersservice
dubbo.consumer.timeout=3600000
dubbo.provider.timeout=3600000
dubbo.registry.timeout=3600000
dubbo.consumer.retries=5
dubbo.provider.retries=5
dubbo.consumer.callbacks=3600000
dubbo.provider.callbacks=3600000
dubbo.consumer.check=false
dubbo.registry.check=false
dubbo.application.qos-enable=false

发部服务，可以这样：

import com.alibaba.dubbo.config.annotation.Service;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.validation.constraints.NotNull;
import java.util.List;

@Service(version = "1.0.0")
@RestController
public class UserProvider implements IUserProvider {

    @Resource
    private TenantBusiness tenantBusiness;

    @Override
    public FuncResultBo<UserVo> createUser(UserVo user, ApiKeyVo api_info) {
        return tenantBusiness.createUser(user, api_info);
    }
}

3、服务提供者SpringBoot启动类中加入：@EnableDubbo属性标记，例如我的：

package com.test.usersservice;

import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@Configuration
@SpringBootApplication()
@ComponentScan({"com.test"})
@EnableJpaRepositories(basePackages = {"com.test.repository"})
@EnableAutoConfiguration
@EntityScan("com.test.domain.po")
@EnableDubbo
public class UsersProviderApplication {

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

4、消费者的application.properties中加入：

spring.application.name=dubbo-consumer-backendsync
dubbo.application.name=dubbo-consumer-backendsync
dubbo.registry.protocol=zookeeper
dubbo.registry.address=172.16.4.131:2181|172.16.4.132:2181|172.16.4.133:2181
dubbo.scan.base-packages=com.test.syncbackend
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880
dubbo.consumer.timeout=3600000
dubbo.provider.timeout=3600000
dubbo.registry.timeout=3600000
dubbo.consumer.retries=5
dubbo.provider.retries=5
dubbo.consumer.callbacks=3600000
dubbo.provider.callbacks=3600000
dubbo.consumer.check=true
dubbo.registry.check=false
dubbo.application.qos-enable=false

5、在消费者启动类中，可以加入EnableDubbo属性标记

@SpringBootApplication
@EnableAutoConfiguration
@EntityScan("com.test.domain.po")
@ComponentScan("com.test")
@PropertySource({"classpath:schedule.properties"})
@EnableJpaRepositories(basePackages = "com.test.repository")
@EnableScheduling
@EnableDubbo
public class BackendApplicationServer {
    public static void main(String[] args) {
        SpringApplicationBuilder springApplicationBuilder = new SpringApplicationBuilder(BackendApplicationServer.class);
        springApplicationBuilder.web(WebApplicationType.NONE);
        springApplicationBuilder.run(args);
    }
}

消费者中调用服务：

    @Reference(version = "1.0.0", timeout = 360000)
    private ITenantProvider iTenantProvider = null;

Reference属性类完整路径位于：import com.alibaba.dubbo.config.annotation.Reference;