关于SpringBoot整合RabbitMQ实现死信队列

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

spring:
  # rabbitmq配置信息 RabbitProperties类
  rabbitmq:
    host: 127.0.0.1
    port: 5672
    username: guest
    password: guest
    virtual-host: /
    # 开启confirm机制
    publisher-confirm-type: correlated
    # 开启return机制
    publisher-returns: true
    #全局配置，局部配置存在就以局部为准
    listener:
      simple:
        acknowledge-mode: manual # 手动ACK

@Configuration
public class RabbitMQConfig {
    /**
     * 正常队列
     */
    public static final String EXCHANGE = "boot-exchange";
    public static final String QUEUE = "boot-queue";
    public static final String ROUTING_KEY = "boot-rout";
    /**
     * 死信队列
     */
    public static final String DEAD_EXCHANGE = "dead-exchange";
    public static final String DEAD_QUEUE = "dead-queue";
    public static final String DEAD_ROUTING_KEY = "dead-rout";
    /**
     * 声明死信交换机
     *
     * @return
     */
    @Bean
    public Exchange deadExchange() {
        return ExchangeBuilder.directExchange(DEAD_EXCHANGE).build();
    }
    /**
     * 声明死信队列
     *
     * @return
     */
    @Bean
    public Queue deadQueue() {
        return QueueBuilder.durable(DEAD_QUEUE).build();
    }
    /**
     * 绑定死信的队列和交换机
     *
     * @param deadExchange
     * @param deadQueue
     * @return
     */
    @Bean
    public Binding deadBind(Exchange deadExchange, Queue deadQueue) {
        return BindingBuilder.bind(deadQueue).to(deadExchange).with(DEAD_ROUTING_KEY).noargs();
    }
    /**
     * 声明交换机，同channel.exchangeDeclare(EXCHANGE, BuiltinExchangeType.DIRECT);
     *
     * @return
     */
    @Bean
    public Exchange bootExchange() {
        return ExchangeBuilder.directExchange(EXCHANGE).build();
    }
    /**
     * 声明队列，同channel.queueDeclare(QUEUE, true, false, false, null);
     * 绑定死信交换机及路由key
     *
     * @return
     */
    @Bean
    public Queue bootQueue() {
        return QueueBuilder.durable(QUEUE)
                .deadLetterExchange(DEAD_EXCHANGE)
                .deadLetterRoutingKey(DEAD_ROUTING_KEY)
                //声明队列属性有更改时需要删除队列
                //给队列设置消息时长
                //.ttl(10000)
                //队列最大长度
                .maxLength(1)
                .build();
    }
    /**
     * 绑定队列和交换机,同 channel.queueBind(QUEUE, EXCHANGE, ROUTING_KEY);
     *
     * @param bootExchange
     * @param bootQueue
     * @return
     */
    @Bean
    public Binding bootBind(Exchange bootExchange, Queue bootQueue) {
        return BindingBuilder.bind(bootQueue).to(bootExchange).with(ROUTING_KEY).noargs();
    }
}

    @RabbitListener(queues = RabbitMQConfig.DEAD_QUEUE)
    public void listener_dead(String msg, Channel channel, Message message) throws IOException {
        System.out.println("死信接收到消息" + msg);
        System.out.println("唯一标识:" + message.getMessageProperties().getCorrelationId());
        System.out.println("messageID:" + message.getMessageProperties().getMessageId());
        channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
    }

    @RabbitListener(queues = RabbitMQConfig.QUEUE)
    public void listener(String msg, Channel channel, Message message) throws IOException {
        System.out.println("接收到消息" + msg);
        channel.basicReject(message.getMessageProperties().getDeliveryTag(), false)
    }

    @RabbitListener(queues = RabbitMQConfig.QUEUE)
    public void listener(String msg, Channel channel, Message message) throws IOException {
        System.out.println("接收到消息" + msg);
 		channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, false);
    }

@SpringBootTest
public class Publisher {
    @Autowired
    private RabbitTemplate template;
        /**
     * 5秒未被消费会路由到死信队列
     */
    @Test
    public void publish_expir() {
        template.convertAndSend(RabbitMQConfig.EXCHANGE, RabbitMQConfig.ROUTING_KEY, "hello expir dead", message -> {
            message.getMessageProperties().setExpiration("5000");
            return message;
        });
    }
}

    @Bean
    public Queue bootQueue() {
        return QueueBuilder.durable(QUEUE)
                .deadLetterExchange(DEAD_EXCHANGE)
                .deadLetterRoutingKey(DEAD_ROUTING_KEY)
                //声明队列属性有更改时需要删除队列
                //给队列设置消息时长
                .ttl(10000)
                .build();
    }

    @Bean
    public Queue bootQueue() {
        return QueueBuilder.durable(QUEUE)
                .deadLetterExchange(DEAD_EXCHANGE)
                .deadLetterRoutingKey(DEAD_ROUTING_KEY)
                //声明队列属性有更改时需要删除队列
                .maxLength(1)
                .build();
    }