stream消息驱动--SpringCloud学习笔记

快速使用

先写一个8801消息的提供者。

pom依赖添加

<?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.meng</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <dependencies>
        <!--web-->
        <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>

        <!--devtool-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!--lombok-->
        <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>

        <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!--spring cloud stream rabbit-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
        </dependency>
    </dependencies>
</project>

然后是application.yml配置

server:
  port: 8801

spring:
  application:
    name: cloud-stream-provider
  cloud:
    stream:
      bindings: #服务整合处理
        output: #名字是通道名称
          destination: studyExchange #表示要使用的Exchange名称定义
          content-type: application/json #配置消息类型
          default-binder: defaultRabbit #配置要绑定的消息服务的具体设置
      binders: #配置要绑定的rabbitmq服务信息
        defaultRabbit:  #定义的名称，用于binding整合
          type: rabbit #消息组件类型
          environment: #配置rabbitmq相关环境
            spring:
              rabbitmq:
                host: 120.98.127.59
                port: 5672
                username: guest
                password: guest
                virtual-host: /
  rabbitmq:
    host: 120.98.127.59
    port: 5672
    username: guest
    password: guest

eureka:
  client:
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
  instance:
    instance-id: send-8801 #修改主机名
    prefer-ip-address: true #访问路径可以显示IP地址

注意，这里有两个rabbitmq标签，但是后面一个rabbitmq其实可以省略，省略后会报Rabbit health check failed异常，但是该异常不影响使用。

然后，简单写一个业务逻辑IMessageProvider接口的服务实现IMessageProviderImpl.java

package com.meng.service.impl;

import com.meng.service.IMessageProvider;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.MessageBuilder;

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

/**
 * @author Administrator
 */
@Slf4j
@EnableBinding(Source.class)    //定义消息的推送管道
public class IMessageProviderImpl implements IMessageProvider {
    
    

    /**
     * 消息发送管道
     */
    @Resource
    private MessageChannel output;

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

注意这里使用的注解，不需要在业务上写@Service注解，这与普通的业务不同。

然后是主启动类

package com.meng;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

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

最后加一个controller层

package com.meng.controller;

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

import javax.annotation.Resource;

/**
 * @author Administrator
 */
@RestController
public class SendMassageController {
    
    

    @Resource
    private IMessageProvider messageProvider;

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

启动8801端口后浏览器访问http://localhost:8801/sendMessage即可。

复杂一点，搭建一个消息的消费者。

消费者

消费者8802端口的搭建。

首先，是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.meng</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <dependencies>
        <!--web-->
        <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>

        <!--devtool-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!--lombok-->
        <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>

        <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!--spring cloud stream rabbit-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
        </dependency>
    </dependencies>

</project>

然后，application.yml

server:
  port: 8802

spring:
  application:
    name: cloud-stream-consumer
  cloud:
    stream:
      bindings: #服务整合处理
        input: #名字是通道名称
          destination: studyExchange #表示要使用的Exchange名称定义
          content-type: application/json #配置消息类型
          default-binder: defaultRabbit #配置要绑定的消息服务的具体设置
      binders: #配置要绑定的rabbitmq服务信息
        defaultRabbit:  #定义的名称，用于binding整合
          type: rabbit #消息组件类型
          environment: #配置rabbitmq相关环境
            spring:
              rabbitmq:
                host: 120.98.127.59
                port: 5672
                username: guest
                password: guest
  rabbitmq:
    host: 120.98.127.59
    port: 5672
    username: guest
    password: guest

eureka:
  client:
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
  instance:
    instance-id: receive-8801 #修改主机名
    prefer-ip-address: true #访问路径可以显示IP地址

然后是主启动类

package com.meng;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @author Administrator
 */
@SpringBootApplication
@EnableEurekaClient
public class StreamMQMain8802 {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(StreamMQMain8802.class,args);
    }
}

这里，消费者不需要业务逻辑，直接上controller层

package com.meng.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;

/**
 * @author Administrator
 */
@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，接收到信息："+message.getPayload()+"\tport:"+serverPort);
    }
}

启动8802端口即可。

在浏览器访问http://localhost:8801/sendMessage，8801端口产生消息时8802也会收到消息。

不同组是可以全面消费（重复消费）的；但是同一组内会发生竞争关系，只有其中一个可以消费，这就需要引入group分组了。

group

yml修改，增加group字段即可。

同组的会轮询收到信息，不同组的都会收到信息。

spring:
  application:
    name: cloud-stream-consumer
  cloud:
    stream:
      bindings: #服务整合处理
        input: #名字是通道名称
          destination: studyExchange #表示要使用的Exchange名称定义
          content-type: application/json #配置消息类型
          default-binder: defaultRabbit #配置要绑定的消息服务的具体设置
          group: group1
      binders: #配置要绑定的rabbitmq服务信息
        defaultRabbit:  #定义的名称，用于binding整合
          type: rabbit #消息组件类型
          environment: #配置rabbitmq相关环境
            spring:
              rabbitmq:
                host: 120.98.127.59
                port: 5672
                username: guest
                password: guest

消息持久化

在加入group之后，即使8802、8803端口没启动时8801消息提供者发送了消息，消费者端口再次打开后也能接收到消息，不会错过。