SpringCloud微服务 Stream集成RabbitMQ(一)

Love The Way You Lie 2022-02-22 11:12 257阅读 0赞

## 前言 ##

本小结我们将学习一下如何使用Spring Cloud Stream 来集成Rabbit MQ 并实现常规业务场景中的发布/订阅模式及其确认机制。  
在学习本小结之前我假设大家已对Spring Cloud Stream 和Rabbit MQ 有实际场景应用的能力，如果暂未掌握请自行学习，这里不赘述。

通常而言，对于发布/订阅模式模式而言，消息的发送者一般只注重将消息推送到相应的Exchange 对应的Channel中，并不在意订阅者是否成功接收并消费掉某条消息。消息发布者只负责把消息送到队列中，订阅者只负责把消息从队列中取出然后消费，两者在业务逻辑上理应是不存在任何耦合或关联的，这也是发布/订阅模式的职责和优点所在。

## 案例 ##

案例说明：本小结将创建两个服务节点Publisher和Subscribe 其中两者互为消息的发布和订阅者。即Pub是Sub的消息发布者，同时为了实现消息确认机制Pub也是Sub的订阅者，Sub至于Pub也是如此。

*  新建 microservice-deal-cloud-stream-rabbitmq-publisher服务节点
    
     *  项目结构  
        ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI0Mzc3ODE_size_16_color_FFFFFF_t_70]
     *  Core Code
        
         *  pom.xml
            
                <?xml version="1.0" encoding="UTF-8"?>
                <project xmlns="http://maven.apache.org/POM/4.0.0"
                	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
                	<modelVersion>4.0.0</modelVersion>
                
                	<artifactId>microservice-deal-cloud-stream-rabbitmq-publisher</artifactId>
                	<packaging>jar</packaging>
                
                	<name>microservice-deal-cloud-stream-rabbitmq-publisher</name>
                	<description>Demo project for Spring Boot</description>
                
                	<parent>
                		<groupId>com.example</groupId>
                		<artifactId>microservice-deal-parent</artifactId>
                		<version>0.0.1-SNAPSHOT</version>
                	</parent>
                
                	<dependencies>
                
                		
                		<dependency>
                			<groupId>org.springframework.boot</groupId>
                			<artifactId>spring-boot-starter-web</artifactId>
                			<exclusions>
                				<exclusion>
                					<groupId>org.springframework.boot</groupId>
                					<artifactId>spring-boot-starter-logging</artifactId>
                				</exclusion>
                			</exclusions>
                		</dependency>
                
                		
                		<dependency>
                			<groupId>org.springframework.boot</groupId>
                			<artifactId>spring-boot-starter-log4j2</artifactId>
                		</dependency>
                		
                
                		
                		<dependency>
                			<groupId>com.fasterxml.jackson.dataformat</groupId>
                			<artifactId>jackson-dataformat-yaml</artifactId>
                		</dependency>
                		
                		<dependency>
                			<groupId>org.springframework.cloud</groupId>
                			<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
                		</dependency>
                	</dependencies>
                
                </project>
         *  application.yml
            
                server:
                  port: 8081
                spring:
                  application:
                    name: microservice-deal-cloud-stream-rabbitmq-publisher #与 microservice-deal-cloud-stream-rabbitmq-subscribe互为 Pub/Sub
                    
                  cloud:
                    stream:
                      binders: 
                        defaultRabbit: 
                          type: rabbit
                          environment: #配置rabbimq连接环境
                            spring: 
                              rabbitmq:
                                host: localhost
                                username: Dustyone
                                password: bai5331359
                                virtual-host: / 
                      bindings: 
                        output:
                          destination: Subscribe  #exchange名称，交换模式默认是topic
                          content-type: application/json
                        input: 
                          destination: Publisher
                          content-type: application/json
                
                
                eureka:
                  client:
                    serviceUrl:
                       #defaultZone: http://Dustyone:bai5331359@192.168.100.232:8080/eureka/
                       defaultZone: http://localhost:8080/eureka/ #http://eureka.springcloud.cn/eureka/
                      #Authorization
                      
                  instance:
                    hostname: Swift
                    prefer-ip-address: true
                    metadata-map:
                      zone: Asia #Eureka可以解析的metadata，会影响到客户端的行为
                      customizedMetadata: eurekaCustomizedMetadata #Eureka不能解析的metadata,不会影响客户端行为  块通过 http://localhost:8761/eureka/apps/{serviceName}查找
                      #instanceId: ${spring.application.name}:${vcap.application.instance_id:${spring.application.instance_id:${random.value}}}
                      instanceId: ${spring.application.name}:${server.port}
                      
                feign:
                  hystrix:
                    enabled: true
         *  ReceiveMsgImpl.java
            
                package com.example.deal.service.impl;
                
                import org.slf4j.Logger;
                import org.slf4j.LoggerFactory;
                import org.springframework.cloud.stream.annotation.EnableBinding;
                import org.springframework.cloud.stream.annotation.StreamListener;
                import org.springframework.cloud.stream.messaging.Sink;
                import org.springframework.messaging.Message;
                import org.springframework.stereotype.Component;
                
                import com.example.deal.service.ReceiveMsg;
                
                /**
                 * 
                 * @ClassName:：ReceiveMsgImpl
                 * @author ：Dustyone
                 * @date ：2019年4月3日 上午11:06:25
                 */
                @Component
                @EnableBinding(value = { Sink.class })
                public class ReceiveMsgImpl implements ReceiveMsg {
                
                	/**
                	 * 引入日志，注意都是"org.slf4j"包下
                	 */
                	private final static Logger logger = LoggerFactory.getLogger(ReceiveMsgImpl.class);
                
                	@Override
                	@StreamListener(Sink.INPUT)
                	public void receiveTime(Message<String> message) {
                		logger.info("接收消息" + message.getPayload().toString());
                	}
                
                }
         *  SendMsgImpl.java
            
                package com.example.deal.service.impl;
                
                import java.text.SimpleDateFormat;
                import java.util.Date;
                
                import org.slf4j.Logger;
                import org.slf4j.LoggerFactory;
                import org.springframework.cloud.stream.annotation.EnableBinding;
                import org.springframework.cloud.stream.messaging.Source;
                import org.springframework.context.annotation.Bean;
                import org.springframework.integration.annotation.InboundChannelAdapter;
                import org.springframework.integration.annotation.Poller;
                import org.springframework.integration.core.MessageSource;
                import org.springframework.messaging.support.GenericMessage;
                
                import com.example.deal.service.SendMsg;
                
                /**
                 * 
                * @ClassName:：SendMsgImpl 
                * @author ：Dustyone
                * @date ：2019年4月3日 上午11:05:08
                 */
                
                @EnableBinding(value = { Source.class })
                public class SendMsgImpl implements SendMsg {
                
                	/**
                	 * 引入日志，注意都是"org.slf4j"包下
                	 */
                	private final static Logger logger = LoggerFactory.getLogger(SendMsgImpl.class);
                
                	private String format = "yyyy-mm-dd  HH:mm:ss";
                	
                	
                	@Bean
                	@InboundChannelAdapter(value = Source.OUTPUT, poller = @Poller(fixedDelay = "2000", maxMessagesPerPoll = "1"))
                	@Override
                	public MessageSource<String> sendTime() {
                		logger.info(new SimpleDateFormat(format).format(new Date()));
                		return () -> new GenericMessage<>(new SimpleDateFormat(format).format(new Date()));
                	}
                
                }
         *  ReceiveMsg.java
            
                package com.example.deal.service;
                
                import org.springframework.messaging.Message;
                
                /**
                 * 
                 * @ClassName:：ReceiveMsg
                 * @author ：Dustyone
                 * @date ：2019年4月3日 上午11:06:09
                 */
                public interface ReceiveMsg {
                	public void receiveTime(Message<String> message);
                }
         *  SendMsg.java
            
                package com.example.deal.service;
                
                import org.springframework.integration.core.MessageSource;
                
                /**
                 * 
                * @ClassName:：SendMsg 
                * @author ：Dustyone
                * @date ：2019年4月3日 上午11:04:30
                 */
                public interface SendMsg {
                
                	public MessageSource<String> sendTime();
                
                }
 *  新建microservice-deal-cloud-stream-rabbitmq-subscribe服务节点
    
     *  项目结构  
        ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI0Mzc3ODE_size_16_color_FFFFFF_t_70 1]
     *  Core Code
        
         *  pom.xml
            
                <?xml version="1.0" encoding="UTF-8"?>
                <project xmlns="http://maven.apache.org/POM/4.0.0"
                	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
                	<modelVersion>4.0.0</modelVersion>
                
                	<artifactId>microservice-deal-cloud-stream-rabbitmq-subscribe</artifactId>
                	<packaging>jar</packaging>
                
                	<name>microservice-deal-cloud-stream-rabbitmq-subscribe</name>
                	<description>Demo project for Spring Boot</description>
                
                	<parent>
                		<groupId>com.example</groupId>
                		<artifactId>microservice-deal-parent</artifactId>
                		<version>0.0.1-SNAPSHOT</version>
                	</parent>
                
                	<dependencies>
                
                		
                		<dependency>
                			<groupId>org.springframework.boot</groupId>
                			<artifactId>spring-boot-starter-web</artifactId>
                			<exclusions>
                				<exclusion>
                					<groupId>org.springframework.boot</groupId>
                					<artifactId>spring-boot-starter-logging</artifactId>
                				</exclusion>
                			</exclusions>
                		</dependency>
                
                		
                		<dependency>
                			<groupId>org.springframework.boot</groupId>
                			<artifactId>spring-boot-starter-log4j2</artifactId>
                		</dependency>
                		
                
                		
                		<dependency>
                			<groupId>com.fasterxml.jackson.dataformat</groupId>
                			<artifactId>jackson-dataformat-yaml</artifactId>
                		</dependency>
                		
                		<dependency>
                			<groupId>org.springframework.cloud</groupId>
                			<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
                		</dependency>
                
                	</dependencies>
                
                </project>
         *  application.yml
            
                server:
                  port: 8082
                spring:
                  application:
                    name: microservice-deal-cloud-stream-rabbitmq-subscribe
                  cloud:
                    stream:
                      binders: 
                        defaultRabbit: 
                          type: rabbit
                          environment: #配置rabbimq连接环境
                            spring: 
                              rabbitmq:
                                host: localhost
                                username: Dustyone
                                password: bai5331359
                                virtual-host: / 
                      bindings: 
                        output:
                          destination: Publisher   #exchange名称，交换模式默认是topic
                          content-type: application/json
                        input: 
                          destination: Subscribe
                          content-type: application/json
                eureka:
                  client:
                    serviceUrl:
                       #defaultZone: http://Dustyone:bai5331359@192.168.100.232:8080/eureka/
                       defaultZone: http://localhost:8080/eureka/ #http://eureka.springcloud.cn/eureka/
                      #Authorization
                      
                  instance:
                    hostname: Swift
                    prefer-ip-address: true
                    metadata-map:
                      zone: Asia #Eureka可以解析的metadata，会影响到客户端的行为
                      customizedMetadata: eurekaCustomizedMetadata #Eureka不能解析的metadata,不会影响客户端行为  块通过 http://localhost:8761/eureka/apps/{serviceName}查找
                      #instanceId: ${spring.application.name}:${vcap.application.instance_id:${spring.application.instance_id:${random.value}}}
                      instanceId: ${spring.application.name}:${server.port}
                      
                feign:
                  hystrix:
                    enabled: true
         *  ReceiveMsgImpl.java
            
                package com.example.deal.service.impl;
                
                import org.slf4j.Logger;
                import org.slf4j.LoggerFactory;
                import org.springframework.cloud.stream.annotation.EnableBinding;
                import org.springframework.cloud.stream.annotation.StreamListener;
                import org.springframework.cloud.stream.messaging.Sink;
                import org.springframework.messaging.Message;
                import org.springframework.stereotype.Component;
                
                import com.example.deal.service.ReceiveMsg;
                
                /**
                 * 
                 * @ClassName:：ReceiveMsgImpl
                 * @author ：Dustyone
                 * @date ：2019年4月3日 上午11:06:25
                 */
                @Component
                @EnableBinding(value = { Sink.class })
                public class ReceiveMsgImpl implements ReceiveMsg {
                
                	/**
                	 * 引入日志，注意都是"org.slf4j"包下
                	 */
                	private final static Logger logger = LoggerFactory.getLogger(ReceiveMsgImpl.class);
                
                	@Override
                	@StreamListener(Sink.INPUT)
                	public void receiveTime(Message<String> message) {
                		logger.info("接收消息" + message.getPayload().toString());
                	}
                
                }
         *  SendMsgImpl.java
            
                package com.example.deal.service.impl;
                
                import java.text.SimpleDateFormat;
                import java.util.Date;
                
                import org.slf4j.Logger;
                import org.slf4j.LoggerFactory;
                import org.springframework.cloud.stream.annotation.EnableBinding;
                import org.springframework.cloud.stream.messaging.Source;
                import org.springframework.context.annotation.Bean;
                import org.springframework.integration.annotation.InboundChannelAdapter;
                import org.springframework.integration.annotation.Poller;
                import org.springframework.integration.core.MessageSource;
                import org.springframework.messaging.support.GenericMessage;
                
                import com.example.deal.service.SendMsg;
                
                /**
                 * 
                * @ClassName:：SendMsgImpl 
                * @author ：Dustyone
                * @date ：2019年4月3日 上午11:05:08
                 */
                
                @EnableBinding(value = { Source.class })
                public class SendMsgImpl implements SendMsg {
                
                	/**
                	 * 引入日志，注意都是"org.slf4j"包下
                	 */
                	private final static Logger logger = LoggerFactory.getLogger(SendMsgImpl.class);
                
                	private String format = "yyyy-mm-dd  HH:mm:ss";
                	
                	
                	@Bean
                	@InboundChannelAdapter(value = Source.OUTPUT, poller = @Poller(fixedDelay = "2000", maxMessagesPerPoll = "1"))
                	@Override
                	public MessageSource<String> sendTime() {
                		logger.info(new SimpleDateFormat(format).format(new Date()));
                		return () -> new GenericMessage<>(new SimpleDateFormat(format).format(new Date()));
                	}
                
                }
         *  ReceiveMsg.java
            
                package com.example.deal.service;
                
                import org.springframework.messaging.Message;
                
                /**
                 * 
                 * @ClassName:：ReceiveMsg
                 * @author ：Dustyone
                 * @date ：2019年4月3日 上午11:06:09
                 */
                public interface ReceiveMsg {
                	public void receiveTime(Message<String> message);
                }
         *  SendMsg.java
            
                package com.example.deal.service;
                
                import org.springframework.integration.core.MessageSource;
                
                /**
                 * 
                * @ClassName:：SendMsg 
                * @author ：Dustyone
                * @date ：2019年4月3日 上午11:04:30
                 */
                public interface SendMsg {
                
                	public MessageSource<String> sendTime();
                
                }
 *  分别运行Publisher和Subscribe
    
     *  Publisher  
        ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI0Mzc3ODE_size_16_color_FFFFFF_t_70 2]
     *  Subscribe  
        ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI0Mzc3ODE_size_16_color_FFFFFF_t_70 3]

## 小结 ##

*  完整源码参考  
    microservice-deal-cloud-stream-rabbitmq-publisher和microservice-deal-cloud-stream-rabbitmq-subscribe

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