(十七) 整合spring cloud云架构 -消息驱动 Spring Cloud Stream

在使用spring cloud云架构的时候，我们不得不使用Spring cloud Stream，因为消息中间件的使用在项目中无处不在，我们公司后面做了娱乐方面的APP，在使用spring cloud做架构的时候，其中消息的异步通知，业务的异步处理都需要使用消息中间件机制。spring cloud的官方给出的集成建议（使用rabbit mq和kafka），我看了一下源码和配置，只要把rabbit mq集成，kafka只是换了一个pom配置jar包而已，闲话少说，我们就直接进入配置实施：

1. 简介：
   Spring cloud Stream 数据流操作开发包，封装了与Redis,Rabbit、Kafka等发送接收消息。
2. 使用工具：
   rabbit，具体的下载和安装细节我这里不做太多讲解，网上的实例太多了
3. 创建commonservice-mq-producer消息的发送者项目，在pom里面配置stream-rabbit的依赖

<span style="font-size: 16px;"><!-- 引入MQ消息驱动的微服务包，引入stream只需要进行配置化即可，是对rabbit、kafka很好的封装 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-stream-rabbit</artifactId> </dependency></span>

4.在yml文件里面配置rabbit mq

<span style="font-size: 16px;">server: port: 5666 spring: application: name: commonservice-mq-producer profiles: active: dev cloud: config: discovery: enabled: true service-id: commonservice-config-server <span style="color: rgb(255, 0, 0);"># rabbitmq和kafka都有相关配置的默认值，如果修改，可以再次进行配置 stream: bindings: mqScoreOutput: destination: honghu_exchange contentType: application/json rabbitmq: host: localhost port: 5672 username: honghu password: honghu</span> eureka: client: service-url: defaultZone: http://honghu:123456@localhost:8761/eureka instance: prefer-ip-address: true</span>

5定义接口ProducerService

<span style="font-size: 16px;">package com.honghu.cloud.producer; import org.springframework.cloud.stream.annotation.Output; import org.springframework.messaging.SubscribableChannel; public interface ProducerService { String SCORE_OUPUT = "mqScoreOutput"; @Output(ProducerService.SCORE_OUPUT) SubscribableChannel sendMessage(); }</span>

6 定义绑定

<span style="font-size: 16px;">package com.honghu.cloud.producer; import org.springframework.cloud.stream.annotation.EnableBinding; @EnableBinding(ProducerService.class) public class SendServerConfig { }</span>

7定义发送消息业务ProducerController

<span style="font-size: 16px;">package com.honghu.cloud.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.integration.support.MessageBuilder; import org.springframework.messaging.Message; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.honghu.cloud.common.code.ResponseCode; import com.honghu.cloud.common.code.ResponseVO; import com.honghu.cloud.entity.User; import com.honghu.cloud.producer.ProducerService; import net.sf.json.JSONObject; @RestController @RequestMapping(value = "producer") public class ProducerController { @Autowired private ProducerService producerService; /** * 通过get方式发送</span>对象<span style="font-size: 16px;"> * @param name 路径参数 * @return 成功|失败 */ @RequestMapping(value = "/sendObj", method = RequestMethod.GET) public ResponseVO sendObj() { User user = new User(1, "hello User"); <span style="color: rgb(255, 0, 0);">Message<User> msg = MessageBuilder.withPayload(user).build();</span> boolean result = producerService.sendMessage().send(msg); if(result){ return ResponseCode.buildEnumResponseVO(ResponseCode.RESPONSE_CODE_SUCCESS, false); } return ResponseCode.buildEnumResponseVO(ResponseCode.RESPONSE_CODE_FAILURE, false); } /** * 通过get方式发送字符串消息 * @param name 路径参数 * @return 成功|失败 */ @RequestMapping(value = "/send/{name}", method = RequestMethod.GET) public ResponseVO send(@PathVariable(value = "name", required = true) String name) { Message msg = MessageBuilder.withPayload(name.getBytes()).build(); boolean result = producerService.sendMessage().send(msg); if(result){ return ResponseCode.buildEnumResponseVO(ResponseCode.RESPONSE_CODE_SUCCESS, false); } return ResponseCode.buildEnumResponseVO(ResponseCode.RESPONSE_CODE_FAILURE, false); } /** * 通过post方式发送</span>json对象<span style="font-size: 16px;"> * @param name 路径参数 * @return 成功|失败 */ @RequestMapping(value = "/sendJsonObj", method = RequestMethod.POST) public ResponseVO sendJsonObj(@RequestBody JSONObject jsonObj) { Message<JSONObject> msg = MessageBuilder.withPayload(jsonObj).build(); boolean result = producerService.sendMessage().send(msg); if(result){ return ResponseCode.buildEnumResponseVO(ResponseCode.RESPONSE_CODE_SUCCESS, false); } return ResponseCode.buildEnumResponseVO(ResponseCode.RESPONSE_CODE_FAILURE, false); } } </span>

8创建commonservice-mq-consumer1消息的消费者项目，在pom里面配置stream-rabbit的依赖

<!-- 引入MQ消息驱动的微服务包，引入stream只需要进行配置化即可，是对rabbit、kafka很好的封装 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-stream-rabbit</artifactId> </dependency>

9在yml文件中配置：

server: port: 5111 spring: application: name: commonservice-mq-consumer1 profiles: active: dev cloud: config: discovery: enabled: true service-id: commonservice-config-server <span style="color: rgb(255, 0, 0);">stream: bindings: mqScoreInput: group: honghu_queue destination: honghu_exchange contentType: application/json rabbitmq: host: localhost port: 5672 username: honghu password: honghu</span> eureka: client: service-url: defaultZone: http://honghu:123456@localhost:8761/eureka instance: prefer-ip-address: true

10定义接口ConsumerService

package com.honghu.cloud.consumer; import org.springframework.cloud.stream.annotation.Input; import org.springframework.messaging.SubscribableChannel; public interface ConsumerService { <span style="color: rgb(255, 0, 0);">String SCORE_INPUT = "mqScoreInput"; @Input(ConsumerService.SCORE_INPUT) SubscribableChannel sendMessage();</span> }

11 定义启动类和消息消费

package com.honghu.cloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.stream.annotation.EnableBinding; import org.springframework.cloud.stream.annotation.StreamListener; import com.honghu.cloud.consumer.ConsumerService; import com.honghu.cloud.entity.User; @EnableEurekaClient @SpringBootApplication @EnableBinding(ConsumerService.class) //可以绑定多个接口 public class ConsumerApplication { public static void main(String[] args) { SpringApplication.run(ConsumerApplication.class, args); } <span style="color: rgb(255, 0, 0);">@StreamListener(ConsumerService.SCORE_INPUT) public void onMessage(Object obj) { System.out.println("消费者1，接收到的消息：" + obj); }</span> }

12 分别启动commonservice-mq-producer、commonservice-mq-consumer1

13 通过postman来验证消息的发送和接收

可以看到接收到了消息，下一章我们介绍mq的集群方案。

到此，整个消息中心方案集成完毕
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