SpringBoot使用RabbitMQ（二）

如未看第一章的建议先看第一章基本用法：SpringBoot使用RabbitMQ

)，这里讲解SpringBoot使用RabbitMQ进行有回调的用法和消费者端手动签收消息的用法。

• yml文件配置

server:
  port: 8080
spring:
  application:
    name: rabbit-confirm
  rabbitmq:
    template:
      # 使用return-callback时必须设置mandatory为true
      mandatory: true
    # 消息发送到交换机确认机制,是否确认回调
    publisher-confirms: true
    # 消息发送到交换机确认机制，是否返回回调
    publisher-returns: true
    listener:
      simple:
        # 并发消费者初始化值
        concurrency: 5
        # 最大值
        max-concurrency: 10
        # 每个消费者每次监听时可拉取处理的消息数量
        prefetch: 20
        # 确认模式设置为手动签收
        acknowledge-mode: manual

• 定义配置类

/**
 * @author Gjing
 **/
@Configuration
public class ConfirmConfiguration {

    /**
     * 声明confirm.message队列
     */
    @Bean
    public Queue confirmQueue() {
        return new Queue("confirm.message");
    }

    /**
     * 声明一个名为exchange-2的交换机
     */
    @Bean
    public TopicExchange exchange2() {
        return new TopicExchange("exchange-2");
    }

    /**
     * 将confirm.message的队列绑定到exchange-2交换机
     */
    @Bean
    public Binding bindMessage1() {
        return BindingBuilder.bind(confirmQueue()).to(exchange2()).with("confirm.message");
    }
}

• 定义生产者

/**
 * @author Gjing
 **/
@Component
@Slf4j
public class ConfirmProducer {
    @Resource
    private RabbitTemplate rabbitTemplate;

    /**
     * 如果消息没有到exchange,则confirm回调,ack=false
     * 如果消息到达exchange,则confirm回调,ack=true
     * exchange到queue成功,则不回调return
     * exchange到queue失败,则回调return(需设置mandatory=true,否则不回回调,消息就丢了)
     */
    private final RabbitTemplate.ConfirmCallback confirmCallback = (correlationData, ack, cause) -> {
        if (!ack) {
            log.error("消息发送失败：correlationData: {},cause: {}", correlationData, cause);
        }else {
            log.info("消息发送成功：correlationData: {},ack: {}", correlationData, ack);
        }
    };

    private final RabbitTemplate.ReturnCallback returnCallback = (message, replyCode, replyText, exchange, routeKey) ->
            log.error("消息丢失: exchange: {},routeKey: {},replyCode: {},replyText: {}", exchange, routeKey, replyCode, replyText);

    /**
     * 发送消息
     * @param message 消息内容
     */
    public void send(String message) {
        // 构建回调返回的数据
        CorrelationData correlationData = new CorrelationData();
        correlationData.setId(TimeUtil.localDateTimeToStamp(LocalDateTime.now()) + "");

        Message message1 = MessageBuilder.withBody(message.toString().getBytes())
                .setContentType(MessageProperties.CONTENT_TYPE_TEXT_PLAIN)
                // 将CorrelationData的id 与 Message的correlationId绑定，然后关系保存起来,然后人工处理
                .setCorrelationId(correlationData.getId())
                .build();
        rabbitTemplate.setConfirmCallback(confirmCallback);
        rabbitTemplate.setReturnCallback(returnCallback);
        rabbitTemplate.convertAndSend("exchange-2", "confirm.message", message1, correlationData);
    }
}

• 定义消费者

/**
 * @author Gjing
 **/
@Component
@Slf4j
public class ConfirmConsumer {

    @RabbitListener(bindings = @QueueBinding(value = @Queue(value = "confirm.message",durable = "true")
            ,exchange = @Exchange(value = "exchange-2",type = "topic")
            ,key = "confirm.message"))
    public void receive(String message, Message message1, Channel channel) throws IOException {
        log.info("消费者收到消息：{}", message);
        long deliverTag = message1.getMessageProperties().getDeliveryTag();
        //第一个deliveryTag参数为每条信息带有的tag值，第二个multiple参数为布尔类型
        //为true时会将小于等于此次tag的所有消息都确认掉，如果为false则只确认当前tag的信息，可根据实际情况进行选择。
        channel.basicAck(deliverTag, false);
    }
}

• 创建controller调用

/**
 * @author Gjing
 **/
@RestController
public class ConfirmController {
    @Resource
    private ConfirmProducer confirmProducer;

    @PostMapping("/confirm-message")
    public void confirmMessage() {
        confirmProducer.send("hello confirm message");
    }
}

• 执行结果

  
  
  1560498638(1).jpg

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以上为个人理解，如有误欢迎各位指正