平时用的消息组件有,RabbitMQ,RocketMQ,Kafka,ActiveMQ

用消息驱动是为了屏蔽底层消息中间件的差异,降低切换版本,统一消息的编程模型

举个例子,你不需要学习mysql,sql server,只需要学会hibernate就可以用包装好的方法去调用sql语句

 

目前SpringCloud Stream消息驱动只支持RabbitMQ,Kafka

先确定好RabbitMQ启动

然后新建三个模块,8801,生产者。8802,8803消费者

 

生产者模块

pom

<?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">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-stream-rabbitmq-provider8801</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
        </dependency>
        <!--基础配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

application.yml。注意这是生产者是output

server:
  port: 8801

spring:
  application:
    name: cloud-stream-provider
  cloud:
    stream:
      binders: # 在此处配置要绑定的rabbitmq的服务信息;
        defaultRabbit: # 表示定义的名称,用于于binding整合
          type: rabbit # 消息组件类型
          environment: # 设置rabbitmq的相关的环境配置
            spring:
              rabbitmq:
                host: localhost
                port: 5672
                username: guest
                password: guest
      bindings: # 服务的整合处理
        output: # 这个名字是一个通道的名称
          destination: studyExchange # 表示要使用的Exchange名称定义
          content-type: application/json # 设置消息类型,本次为json,文本则设置“text/plain”
          binder: defaultRabbit # 设置要绑定的消息服务的具体设置

eureka:
  client: # 客户端进行Eureka注册的配置
    service-url:
      defaultZone: http://localhost:7001/eureka
  instance:
    lease-renewal-interval-in-seconds: 2 # 设置心跳的时间间隔(默认是30秒)
    lease-expiration-duration-in-seconds: 5 # 如果现在超过了5秒的间隔(默认是90秒)
    instance-id: send-8801.com  # 在信息列表时显示主机名称
    prefer-ip-address: true     # 访问的路径变为IP地址

启动类

@SpringBootApplication
public class StreamMQMain8801
{
    public static void main(String[] args)
    {
        SpringApplication.run(StreamMQMain8801.class,args);
    }
}

service接口

public interface IMessageProvider
{
    public String send();
}

service实现类。注意虽然是service实现类,但是不加@Service注解。这个注解上面图有。指的信道channel和exchange绑定在一起

package com.atguigu.springcloud.service.impl;

import com.atguigu.springcloud.service.IMessageProvider;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.integration.support.MessageBuilderFactory;
import org.springframework.messaging.MessageChannel;
import org.springframework.integration.support.MessageBuilder;
import javax.annotation.Resource;
import org.springframework.cloud.stream.messaging.Source;

import javax.annotation.Resource;
import java.util.UUID;

/**
 * Created by IntelliJ IDEA.
 * User: zhuangzibing
 * Date: 2020/7/9
 */
@EnableBinding(Source.class) //定义消息的推送管道
public class MessageProviderImpl implements IMessageProvider
{
    @Resource
    private MessageChannel output; // 消息发送管道

    @Override
    public String send()
    {
        String serial = UUID.randomUUID().toString();
        output.send(MessageBuilder.withPayload(serial).build());
        System.out.println("*****serial: "+serial);
        return null;
    }
}

控制器

package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.service.IMessageProvider;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * Created by IntelliJ IDEA.
 * User: zhuangzibing
 * Date: 2020/7/9
 */
@RestController
public class SendMessageController
{
    @Resource
    private IMessageProvider messageProvider;

    @GetMapping(value = "/sendMessage")
    public String sendMessage()
    {
        return messageProvider.send();
    }

}

启动7001,在启动8801即可,控制台和rabbitMQ有反应

上图的studyExchange就是application里命名的

 

接下来是8802和8803,因为是一样的步骤 ,除了些命名方式从8802改为8803即可,所以只写8802的步骤

pom

<?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">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-stream-rabbitmq-consumer8802</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--基础配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

application.yml。注意这里是bindings的input,接收消息。

server:
  port: 8802

spring:
  application:
    name: cloud-stream-consumer
  cloud:
    stream:
      binders: # 在此处配置要绑定的rabbitmq的服务信息;
        defaultRabbit: # 表示定义的名称,用于于binding整合
          type: rabbit # 消息组件类型
          environment: # 设置rabbitmq的相关的环境配置
            spring:
              rabbitmq:
                host: localhost
                port: 5672
                username: guest
                password: guest
      bindings: # 服务的整合处理
        input: # 这个名字是一个通道的名称
          destination: studyExchange # 表示要使用的Exchange名称定义
          content-type: application/json # 设置消息类型,本次为对象json,如果是文本则设置“text/plain”
          binder: defaultRabbit # 设置要绑定的消息服务的具体设置



eureka:
  client: # 客户端进行Eureka注册的配置
    service-url:
      defaultZone: http://localhost:7001/eureka
  instance:
    lease-renewal-interval-in-seconds: 2 # 设置心跳的时间间隔(默认是30秒)
    lease-expiration-duration-in-seconds: 5 # 如果现在超过了5秒的间隔(默认是90秒)
    instance-id: receive-8802.com  # 在信息列表时显示主机名称
    prefer-ip-address: true     # 访问的路径变为IP地址




启动类

@SpringBootApplication
public class StreamMQMain8802 {

    public static void main(String[] args) {
        SpringApplication.run(StreamMQMain8802.class, args);
    }

}

控制器 

package com.atguigu.springcloud.controller;

import org.springframework.beans.factory.annotation.Value;
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 org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * Created by IntelliJ IDEA.
 * User: zhuangzibing
 * Date: 2020/7/9
 */

@Component
@EnableBinding(Sink.class)
public class ReceiveMessageListenerController {

    @Value("${server.port}")
    private String serverPort;

    @StreamListener(Sink.INPUT)
    public void input(Message<String> message){
        System.out.println("消费者1号。8802,街道的消息是:"+ message.getPayload() + "端口号" + serverPort);
    }
}

效果

 

 

有个问题,上一章说明这是为了解决特殊化需求的

就是不需要全部都获得消息,只需要自己指定的模块获得消息

现在的做法是8802,8803都获取到了消息

原因是,默认分组是不同的,认为是不同的组

我们可以用stream消息分组来解决,把他们分成一个组即可

不同组,都会消费,同一个组,只有一个会消费

 

先演示下如何分组。8802写atguiguA,8803写atguiguB

启动即可

 

轮询消费,改为同一个组名即可

其中还有个持久化功能(防止消息丢失)

停止8802和8803,然后去掉8802的分组。此时8801发送消息 ,消息会留在丢列中,启动8802,8802接收不到消息,但是启动还带着分组的8803,8803会接受到8801发来的消息

 

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