一、消息驱动

1.1 当前问题

消息中间件太多了，学习不同消息中间件浪费大量时间，需要一个东西可以再不同场景中切换消息中间件。

1.2 Spring cloud Stream

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-只支持rabbitmp和kfaka

1.3 input和output

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1.4 binder

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1.5 stream流程

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1.6 常用注解

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1.7 项目模块

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二、实操

2.1 provider消息驱动生产者

2.1.1 作用

生产消息发送到消息中间件

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

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <!--        <dependency>-->
        <!--            <groupId>org.springframework.boot</groupId>-->
        <!--            <artifactId>spring-boot-devtools</artifactId>-->
        <!--            <scope>runtime</scope>-->
        <!--            <optional>true</optional>-->
        <!--        </dependency>-->

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

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

注意这里: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

controller

package com.pack.mymodel.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class sendMeesgaController {
    @Resource
    private IMessageProviderService messageProviderService;

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

}

services

接口

public interface IMessageProviderService {
    /**
     * 定义消息的推送管道
     *
     * @return
     */
    String send();
}

实现类

package com.pack.mymodel.services.Imp;

import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.integration.support.MessageBuilder;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;

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


/**
 * @author lixiaolong
 * @EnableBinding(Source.class) 定义消息的推送管道 将Channel和Exchanges绑定在一起
 * @date 2020/12/31 13:35
 */
/*

 */
@EnableBinding(Source.class)
public class MessageProviderImp implements IMessageProviderService {
    /**
     * 消息发送管道/信道
     */
    @Resource
    private MessageChannel output;

    @Override
    public String send() {
        String serial = UUID.randomUUID().toString();
        //MessageBuilder.withPayload(serial).build();
        Message<String> stringMessage = MessageBuilder.withPayload(serial).build();
        output.send(stringMessage);

        System.out.println("*****serial: " + serial);
        return serial;
    }
}

controller类

package com.pack.mymodel.controller;

import com.pack.mymodel.services.Imp.IMessageProviderService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class sendMeesgaController {
    @Resource
    private IMessageProviderService messageProviderService;

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

2.1.2 测试消息是否到消息中间件

启动eureka
启动rabbitmq
启动8001
访问http://localhost:8801/sendMessage

2.2 消息驱动消费者

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: 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

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;

/**
 * 8802 接收消息
 *
 * @author lixiaolong
 * @date 2020/12/31 14:07
 */
@Component
@EnableBinding(Sink.class)
public class mycontroller {
    @Value("${server.port}")
    private String serverPort;

    @StreamListener(Sink.INPUT)
    //从消息队列中取出消息
    public void input(Message<String> message) {
        System.out.println("port:" + serverPort + "\t接受：" + message.getPayload());
    }

}

主启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author lixiaolong
 * @date 2020/12/18 16:05
 * @description 支付服务
 */
@SpringBootApplication
public class bootMAin {
    public static void main(String[] args) {
        SpringApplication.run(bootMAin.class, args);
        System.out.println("启动成功");
    }

}

<dependencies>


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

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <!--        <dependency>-->
        <!--            <groupId>org.springframework.boot</groupId>-->
        <!--            <artifactId>spring-boot-devtools</artifactId>-->
        <!--            <scope>runtime</scope>-->
        <!--            <optional>true</optional>-->
        <!--        </dependency>-->

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>