（十七）JavaB2B2Co2o多用戶商城-消息驅動 Spring Cloud Stream

在使用spring cloud雲架構的時候，我們不得不使用Spring cloud Stream，因爲消息中間件的使用在項目中無處不在，我們公司後面做了娛樂方面的APP，在使用spring cloud做架構的時候，其中消息的異步通知，業務的異步處理都需要使用消息中間件機制。spring cloud的官方給出的集成建議（使用rabbit mq和kafka），我看了一下源碼和配置，只要把rabbit mq集成，kafka只是換了一個pom配置jar包而已，閒話少說，我們就直接進入配置實施：

1. 簡介：

Spring cloud Stream 數據流操作開發包，封裝了與Redis,Rabbit、Kafka等發送接收消息。

2. 使用工具：

rabbit，具體的下載和安裝細節我這裏不做太多講解，網上的實例太多了

3. 創建commonservice-mq-producer消息的發送者項目，在pom裏面配置stream-rabbit的依賴

<span style="font-size: 16px;"><!-- 引入MQ消息驅動的微服務包，引入stream只需要進行配置化即可，是對rabbit、kafka很好的封裝 -->  
<dependency>  
    <groupId>org.springframework.cloud</groupId>  
    <artifactId>spring-cloud-starter-stream-rabbit</artifactId>  
</dependency></span>  

4. 在yml文件裏面配置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: #ff0000;"># rabbitmq和kafka都有相關配置的默認值，如果修改，可以再次進行配置  
    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. 定義接口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. 定義綁定

<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. 定義發送消息業務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;  

    /** 
     * 通過get方式發送</span>對象<span style="font-size: 16px;"> 
     * @param name 路徑參數 
     * @return 成功|失敗 
     */  
    @RequestMapping(value = "/sendObj", method = RequestMethod.GET)  
    public ResponseVO sendObj() {  
        User user = new User(1, "hello User");  
        <span style="color: #ff0000;">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);  
    }  

    /** 
     * 通過get方式發送字符串消息 
     * @param name 路徑參數 
     * @return 成功|失敗 
     */  
    @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);  
    }  

    /** 
     * 通過post方式發送</span>json對象<span style="font-size: 16px;"> 
     * @param name 路徑參數 
     * @return 成功|失敗 
     */  
    @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. 創建commonservice-mq-consumer1消息的消費者項目，在pom裏面配置stream-rabbit的依賴

<!-- 引入MQ消息驅動的微服務包，引入stream只需要進行配置化即可，是對rabbit、kafka很好的封裝 -->  
<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: #ff0000;">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. 定義接口ConsumerService

package com.honghu.cloud.consumer;  

import org.springframework.cloud.stream.annotation.Input;  
import org.springframework.messaging.SubscribableChannel;  

public interface ConsumerService {  

    <span style="color: #ff0000;">String SCORE_INPUT = "mqScoreInput";  

    @Input(ConsumerService.SCORE_INPUT)  
    SubscribableChannel sendMessage();</span>  

}