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Spring Cloud Stream整合RocketMQ

这里书接上回，默认你已经搭建好了RocketMQ主从异步集群，前面文章已经介绍过搭建方法。

1、Spring Cloud Stream介绍

Spring Cloud Stream是一个框架，用于构建与共享消息系统连接的高度可扩展的事件驱动微服务。

官网：https://spring.io/projects/spring-cloud-stream

该框架提供了一个灵活的编程模型，该模型基于已经建立和熟悉的Spring习惯用法和最佳实践，包括对持久pub/sub语义、消费者组和有状态分区的支持。

Spring Cloud Stream的核心构建块是：

• Destination Binders:负责提供与外部消息传递系统集成的组件。
• Destination Bindings:外部消息系统和最终用户提供的应用程序代码(生产者/消费者)之间的桥梁。
• Message:生产者和消费者用来与目标绑定器(以及通过外部消息系统的其他应用程序)进行通信的规范数据结构。

2、生产者

2.1 引入依赖

<dependencies><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>${spring-cloud-alibaba.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-stream-rocketmq</artifactId><version>2.2.2.RELEASE</version><exclusions><exclusion><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client</artifactId></exclusion><exclusion><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-acl</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client</artifactId><version>4.7.1</version></dependency><dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-acl</artifactId><version>4.7.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies>

注意，RocketMQ官方维护的Spring-Cloud-Stream依赖中的rocketmq版本为4.4，需要排出后加入4.7.1的依。

2.2 编写配置文件

spring:application:name: my-spring-cloud-rocketmq-producercloud:stream:bindings:output:destination: TopicTestrocketmq:binder:name-server: 192.168.159.34:9876
server:port: 8080

2.3 启动类打上注解

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;@EnableBinding(Source.class)
@SpringBootApplication
public class MySpringCloudRocketmqProducerApplication {public static void main(String[] args) {SpringApplication.run(MySpringCloudRocketmqProducerApplication.class, args);}
}

其中，@EnableBinding(Source.class)指向配置文件的output参数。

2.4 编写生产者程序

import org.apache.rocketmq.common.message.MessageConst;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map;@Component
public class MyProducer {@Resourceprivate Source source;public void sendMessage(String msg){//封装消息头Map<String,Object> headers=new HashMap<>();headers.put(MessageConst.PROPERTY_TAGS,"TagA");MessageHeaders messageHeaders=new MessageHeaders(headers);//创建消息对象Message<String> message = MessageBuilder.createMessage(msg, messageHeaders);//发送消息source.output().send(message);}
}

2.5 编写单元测试发送消息

@SpringBootTest
class MySpringCloudRocketmqProducerApplicationTests {@Autowiredprivate MyProducer producer;@Testvoid contextLoads() {producer.sendMessage("hello,spring cloud stream message");}}

3、消费者

3.1 引入依赖

与生产者相同。

3.2 编写配置文件

spring:application:name: my-spring-cloud-rocketmq-consumercloud:stream:bindings:# input消费者input:destination: TopicTestgroup: spring-cloud-stream-consumer-group# 配置RocketMQrocketmq:binder:name-server: 192.168.159.34:9876
server:port: 8081

3.3 启动类打上注解

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Sink;@EnableBinding(Sink.class)
@SpringBootApplication
public class MySpringCloudRocketmqConsumerApplication {public static void main(String[] args) {SpringApplication.run(MySpringCloudRocketmqConsumerApplication.class, args);}}

其中@EnableBinding(Sink.class)指向配置文件的input参数。

3.4 编写消费者程序

import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;
import org.springframework.stereotype.Component;@Component
public class MyConsumer {@StreamListener(Sink.INPUT)public void processMessage(String message){System.out.println("收到的消息："+message);}
}

先启动消费者，使用单元测试发送消息。