java实现死信队列

Java实现死信队列的步骤如下：
1.创建普通队列和死信队列

@Bean
public Queue queue() {
    Map<String, Object> args = new HashMap<>();
    // 设置死信交换机
    args.put("x-dead-letter-exchange", "exchange.dead");    // 设置死信路由键
    args.put("x-dead-letter-routing-key", "routing.dead");
    return new Queue("queue.normal", true, false, false, args);
}

@Bean
public Queue deadQueue() {
    return new Queue("queue.dead", true);
}

2.创建普通交换机和死信交换机

@Bean
public DirectExchange exchange() {
    return new DirectExchange("exchange.normal", true, false);
}

@Bean
public DirectExchange deadExchange() {
    return new DirectExchange("exchange.dead", true, false);
}

3.将普通队列和普通交换机绑定

@Bean
public Binding binding() {
    return BindingBuilder.bind(queue()).to(exchange()).with("routing.normal");
}

4.将死信队列和死信交换机绑定

@Bean
public Binding deadBinding() {
    return BindingBuilder.bind(deadQueue()).to(deadExchange()).with("routing.dead");
}

5.监听普通队列，处理消息

@RabbitListener(queues = "queue.normal")
public void process(Message message, Channel channel) throws IOException {
    try {
        // 处理消息
    } catch (Exception e) {
        // 发送到死信队列
        channel.basicPublish("exchange.dead", "routing.dead", null, message.getBody());
        // 手动确认消息已被消费
        channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
    }
}

以上是Java实现死信队列的基本步骤，具体实现可以根据实际需求进行调整。