消息被拒MQ

生产者

/**
 * 消息被拒的情况
 */
public class Produce0001 {
    private  static  final  String NORMAL_EXCHANGE="normal_exchange";
    public static void main(String[] args) throws  Exception{
        Channel channel = untils.getChannel();
        channel.exchangeDeclare(NORMAL_EXCHANGE, BuiltinExchangeType.DIRECT);
        //该消息用作队列的个数限制
        for(int i=0;i<10;i++)
        {
            String message="info"+i;
            channel.basicPublish(NORMAL_EXCHANGE,"zhangsan",null,message.getBytes(StandardCharsets.UTF_8));
            System.out.println("生产者发送消息"+message);
        }
    }
}

消费者：

 

/**
 * 消息被拒的情况
 */
public class Consumer0001 {
        //普通交换机
        private  static  final  String NORMAL_EXCHANGE="normal_exchange";
        //死信交换机
        private  static  final  String DEAD_EXCHANGE="dead_exchange";

        public static void main(String[] args) throws  Exception{
            Channel channel = untils.getChannel();
            //声明死信交换机，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);
            //死信队列绑定交换和routingKey值
            channel.queueBind(deadQueue,DEAD_EXCHANGE,"lisi");
            //正常队列绑定死信队列
            Map<String,Object> 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");
            //正常队列设置的最大限制长度
            params.put("x-max-length",6);
            System.out.println("等待接收消息....");
            String normalQueue="normal_queue";
            channel.queueDeclare(normalQueue,false,false,false,params);
            channel.queueBind(normalQueue,NORMAL_EXCHANGE,"zhangsan");
            DeliverCallback deliverCallback=(consumerTag, message) -> {
                String s = new String(message.getBody(), StandardCharsets.UTF_8);
                if (s.equals("info5"))
                {
                    System.out.println("info5拒接");
                    channel.basicReject(message.getEnvelope().getDeliveryTag(), false);
                }
                else
                {
                    System.out.println("01接收到消息"+s);
                    channel.basicAck(message.getEnvelope().getDeliveryTag(), false);
                }
            };
            channel.basicConsume(normalQueue,false,deliverCallback,consumerTag -> {});
        }
}

结果：