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前言

在之前的工作中，微服务框架使用的是springcloud，消息中间件使用的rocketmq，这段时间看到阿里出了spring cloud alibaba集成了rocketmq，出于好奇，写了个demo

一些概念

• 官方对 Spring Cloud Stream 的一段介绍：Spring Cloud Stream 是一个用于构建基于消息的微服务应用框架。基于 SpringBoot 创建具有生产级别的单机 Spring 应用，并且使用 Spring Integration 与 Broker 进行连接。
• Binder ：Components responsible to provide integration with the external messaging systems.【与外部消息中间件进行集成】
• Binding：Bridge between the external messaging systems and application provided Producers and Consumers of messages (created by the Destination Binders).【在消息中间件与应用程序提供的 Provider 和 Consumer 之间提供了一个桥梁，开发者只需使用应用程序的 生产者或消费者生产或消费数据即可，屏蔽了开发者与底层消息中间件的接触。】
• Message: The canonical data structure used by producers and consumers to communicate with Destination Binders (and thus other applications via external messaging systems).【生产者和消费者用于与目标绑定器通信的规范数据结构。】

快速在本地启动rocketmq

第一步：下载：https://www.apache.org/dyn/closer.cgi?path=rocketmq/4.3.2/rocketmq-all-4.3.2-bin-release.zip
第二步：解压
第三步：修改三个配置文件：runbroker.sh,runserver.sh,tools.sh,将其中JAVA_HOME改成自己电脑的环境配置,修改完如下

[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=自己的地址
#[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=/usr/java
[ ! -e "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOME variable in your environment, We need java(x64)!"

第四步：依次执行命令

./mqnamesrv
./mqbroker -n localhost:9876
./mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t test-topic

如果启动成功，没有报错，代表启动成功哈，下面就可以开发了

开发demo

第一步：导入相关的pom

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>0.2.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
 </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-rocketmq</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
         <!-- 为了Endpoint 信息查看 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>io.dropwizard.metrics</groupId>
            <artifactId>metrics-core</artifactId>
            <version>3.2.6</version>
        </dependency>

第二步：建一个springboot项目，启动类如下：

@SpringBootApplication
@EnableBinding({ Source.class, Sink.class })
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

第三步：创建provider

@Service
public class RocketmqProducer {
    public void send(String message) throws MQClientException, RemotingException, InterruptedException, MQBrokerException {
        DefaultMQProducer producer = new DefaultMQProducer("test_producer_group");
        producer.setNamesrvAddr("127.0.0.1:9876");
        producer.start();

        Message msg = new Message("test-topic", "test-tag", message.getBytes());
        producer.send(msg);
    }
}

第四步：创建consumer

@Service
public class ReceiveService {

    /**
     * 默认是input，在Sink类中指定，如果想要多个input，需要写一个实现Sink的类
     * @param receiveMsg
     */
    @StreamListener("input")
    public void receiveInput1(String receiveMsg) {
        System.out.println("input receive: " + receiveMsg);
    }

}

第五步：加入配置文件：

server.port=8087
spring.application.name=spring-cloud-alibaba-rocketmq-demo

# 配置rocketmq的nameserver地址
spring.cloud.stream.rocketmq.binder.namesrv-addr=127.0.0.1:9876
# 定义name为output的binding
spring.cloud.stream.bindings.output.destination=test-topic
spring.cloud.stream.bindings.output.content-type=application/json
#定义name为input的binding
spring.cloud.stream.bindings.input.destination=test-topic
spring.cloud.stream.bindings.input.content-type=application/json
spring.cloud.stream.bindings.input.group=test-group

management.endpoint.health.show-details=always

第六步：写一个controller，启动项目，访问接口

@RestController
@RequestMapping(value = "/api/demo/test")
public class TestController {

    @Autowired
    RocketmqProducer rocketmqProducer;

    @RequestMapping(value = "/send", method = RequestMethod.GET)
    public String send() throws InterruptedException, RemotingException, MQClientException, MQBrokerException {
        rocketmqProducer.send("test rocketmq message");
        return "success";
    }
}

会看到控制台输出：input receive: test rocketmq message

Endpoint 信息查看

浏览器输入：http://127.0.0.1:8087/actuator/rocketmq-binder

结语

这一篇文章只是将spring cloud stream 和 rocketmq跑通了，其实对于spring cloud stream和rocketmq还是学习的阶段，只能感叹spring cloud博大精深