RabbitMQ的相关操作6--死信队列

• 1. 项目依赖以及工具类如前面操作所示
• 2. 创建两个消费者一个为正常队列，一个为死信队列
• 3. 创建生产者
• 4. 运行测试

按照如下所示就行代码编写

public class Consumer01 {

    //普通交换机名称
    private static final String NORMAL_EXCHANGE = "normal_exchange";
    //死信交换机名称
    private static final String DEAD_EXCHANGE = "dead_exchange";

    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMqUtils.getChannel();

        //声明死信和普通交换机 类型为 direct
        channel.exchangeDeclare(NORMAL_EXCHANGE, BuiltinExchangeType.DIRECT);
        channel.exchangeDeclare(DEAD_EXCHANGE, BuiltinExchangeType.DIRECT);

        //声明死信队列
        String deadQueue = "dead-queue";
        channel.queueDeclare(deadQueue, false, false, false, null);
        //死信队列绑定：队列、交换机、路由键（routingKey）
        channel.queueBind(deadQueue, DEAD_EXCHANGE, "lisi");

        //正常队列绑定死信队列信息
        Map params = new HashMap<>();
        //正常队列设置死信交换机 参数 key 是固定值
        params.put("x-dead-letter-exchange", DEAD_EXCHANGE);
        //正常队列设置死信 routing-key 参数 key 是固定值
        params.put("x-dead-letter-routing-key", "lisi");
        //设置正常队列的长度限制，超出会进入死信队列
//        params.put("x-max-length",6);

        //正常队列
        String normalQueue = "normal-queue";
        channel.queueDeclare(normalQueue, false, false, false, params);
        channel.queueBind(normalQueue, NORMAL_EXCHANGE, "zhangsan");

        System.out.println("等待接收消息........... ");
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            if (message.equals("info6")){
                System.out.println("Consumer01 接收到消息" + message + ":此消息被拒收");
                channel.basicReject(delivery.getEnvelope().getDeliveryTag(),false);
            }else {
                System.out.println("Consumer01 接收到消息" + message);
                channel.basicAck(delivery.getEnvelope().getDeliveryTag(),false);
            }
        };
        //开启手动应答，自动应答的时候不会拒绝
        channel.basicConsume(normalQueue, false, deliverCallback, consumerTag -> {
        });
    }
}

public class Consumer02 {

    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMqUtils.getChannel();
        String deadQueue = "dead-queue";
        System.out.println("等待接收死信消息........... ");
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println("Consumer02 接收到消息" + message);
        };
        channel.basicConsume(deadQueue, true, deliverCallback, consumerTag -> {
        });
    }
}

public class Producer {

    private static final String NORMAL_EXCHANGE = "normal_exchange";

    public static void main(String[] args) throws IOException, TimeoutException {
        Channel channel = RabbitMqUtils.getChannel();
        //死信消息，设置TTL时间，单位ms
        AMQP.BasicProperties properties =
                new AMQP.BasicProperties()
                .builder()
                .expiration("10000")
                .build();

        for (int i = 0; i < 10; i++) {
            String message = "info" + i;
            channel.basicPublish(NORMAL_EXCHANGE,"zhangsan",properties,message.getBytes(StandardCharsets.UTF_8));
        }
    }
}

发现拒收info6，其被消费者2接收