SpringBoot整合RabbitMQ 手动应答(简单demo)

<?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>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <groupId>com.demo</groupId>
  <artifactId>rabbitmq-demo</artifactId>
  <version>1.0.0</version>

  <properties>
    <lombok.version>1.18.12</lombok.version>
  </properties>

  <dependencies>
    <!--web 模块-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

		<!-- AMQP -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-amqp</artifactId>
    </dependency>

    <!-- lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
      <scope>provided</scope>
      <version>${lombok.version}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

server:
 port: 20002
spring:
 rabbitmq:
 	# 这里我改了本地的hosts，实际地址是192.168.0.121
  host: vm.com
  port: 5672
  virtual-host: /
  username: admin
  password: admin
  # 开启消息确认模式
  # 消息发送到交换机确认机制，是否确认回调
  # publisher-confirms: true
  # 是否返回回调
  publisher-returns: true
  template:
   #开启mandatory: true, basic.return方法将消息返还给生产者
   mandatory: true
  listener:
   simple:
   	# 手动应答
    acknowledge-mode: manual
    # 最少消费者数量
    concurrency: 1 
    # 最多消费者数量
    max-concurrency: 10
    # 支持重试
    retry:
     enabled: true 

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

@Configuration
@Slf4j
public class RabbitConfig {

  private RabbitTemplate rabbitTemplate;

  @Bean
  public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
    rabbitTemplate = new RabbitTemplate(connectionFactory);
    return rabbitTemplate;
  }

}

@Component
public class Producer {
  
  // @Qualifier("rabbitTemplate")
  @Autowired
  private RabbitTemplate rabbitTemplate;

  public void send() {
    for (int i = 0; i < 5; i++) {
      System.out.println("生产者发送消息，序号为: " + i);
      rabbitTemplate.convertAndSend("test", String.valueOf(i));
    }
  }
}

@Component
@Slf4j
public class Consumer {

  /**
   * 消费者1 模拟正常处理消息的情况，消息处理完毕发送确认应答
   * @param message
   * @param channel
   * @throws IOException
   */
  @RabbitListener(queues = "test")
  public void process1(Message message, Channel channel) throws IOException {
    log.info("消费者1 接收消息: " + new String(message.getBody()));
    log.info("消费者1 确认应答消息：" + new String(message.getBody()));
    channel.basicAck(message.getMessageProperties().getDeliveryTag(), true);
  }

  /**
   * 消费者2 模拟处理消息出错的情况，消费者2向rabbitmq发送拒绝应答。
   * 处理失败的消息会被重新放入ready中，再次发送给消费者，直至收到确认应答
   * @param message
   * @param channel
   * @throws IOException
   */
  @RabbitListener(queues = "test")
  public void process2(Message message, Channel channel) throws IOException {
    log.info("消费者2 接收消息：" + new String(message.getBody()));
    log.info("消费者2 拒绝应答消息：" + new String(message.getBody()));
    channel.basicReject(message.getMessageProperties().getDeliveryTag(), true);
  }
}

@RestController
@RequestMapping("")
public class RabbitMqController {

  @Autowired
  private Producer producer;

  @GetMapping("/send")
  public String send() {
    producer.send();
    return "发送完成";
  }
}