springcloud Stream整合rabbitmq消息驱动生产者踩坑

消息驱动之生产者8801(踩坑记录)
1.首先说一下情况，我是跟着尚硅谷周阳老师的springcloud2020教程学习的，前面也踩了不少坑，但是这个坑，是我找的比较久的坑了，所以希望大家能直接看到我这个，顺顺利利学习下去哈哈哈！

2.pom文件

<?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>

3.application.yml

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: 192.168.213.130
                port: 5672
                username: admin
                password: 123
            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

4.主启动类

package com.atguigu.springcloud;

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

/**
 * @author zx
 * @create 2023-03-23 9:50
 */
@SpringBootApplication
@EnableEurekaClient
public class StreamMQMain8801 {
    public static void main(String[] args) {
        SpringApplication.run(StreamMQMain8801.class,args);
    }
}

5.发送消息的接口

package com.atguigu.springcloud.service;

/**
 * @author zx
 * @create 2023-03-23 9:54
 */
public interface IMessageProvider {

    public String send();
}

6.接口的实现类

package com.atguigu.springcloud.service.impl;

import com.atguigu.springcloud.service.IMessageProvider;
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 zx
 * @create 2023-03-23 9:55
 */
@EnableBinding(Source.class)//定义消息的推送管道
public class MessageProviderImpl implements IMessageProvider {

    @Resource
    private MessageChannel output;

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

7.Controller层代码

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;

/**
 * @author zx
 * @create 2023-03-23 10:12
 */
@RestController
public class SendMessageController {

    @Resource
    private IMessageProvider messageProvider;

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

}

​

8.测试，先启动7001，再启动rabbitmq(成功登录进去)，然后启动8801

发现已经成功注入进Eureka服务中心

然后发现8801的控制台打印消息(就是这个该死的错误，排除了很多原因，最后终于找到原因了)

9.解决方法(修改application.yml文件)

management:
  health:
    rabbit:
      enabled: false

加入此配置后，能够正常运行消息生产者了。

浏览器访问

http://localhost:8801/sendMessage

10.bug原因

因为使用了spring.cloud.stream.binders.*.environment属性配置rabbitMQ的相关信息，但是没配置spring.rabbitmq。这就导致自动配置检测到类路径下有rabbit相关的类，就配置了rabbit相关的Bean
没有检测到spring.rabbitmq相关的配置，就使用了默认的配置，尝试连接localhost:5672，然后就出现了org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused: connect
具体想详细了解的话可以看一下源码(org.springframework.boot.actuate.amqp.RabbitHealthIndicator)

11.心得

遇见困难，就要解决困难，被bug挡住了很难受，但是解决了就非常的爽，加油!