SpringBoot的RabbitMQ怎么先启动消费者？

Question

使用@RabbitListener监听，但好像必须有队列的情况才能启动，但要是生产者那还没开发好，我这消费者怎么启动？

Answer 1

消费者会一直监听,如生产者启动就会消费消息

        ConnectionFactory factory = new ConnectionFactory();
        //cpolar公网地址
        factory.setHost("1.tcp.cpolar.cn");
        //公网地址对于的端口号
        factory.setPort(24889);

        //用户名和密码
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = null;
        Channel channel = null;
        try {
            // 1.创建连接和通道
            connection = factory.newConnection();
            channel = connection.createChannel();

            // 2.为通道声明exchange以及exchange类型
            channel.exchangeDeclare("exchange", BuiltinExchangeType.FANOUT);

            // 3.创建随机名字的队列
            String queueName = channel.queueDeclare().getQueue();

            // 4.建立exchange和队列的绑定关系
            channel.queueBind(queueName, "exchange", "");
            System.out.println(" **** Consumer1 keep alive ,waiting for messages, and then deal them");
            // 5.通过回调生成消费者并进行监听
            Consumer consumer = new DefaultConsumer(channel) {
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope,
                                           com.rabbitmq.client.AMQP.BasicProperties properties, byte[] body) throws IOException {

                    // 获取消息内容然后处理
                    String msg = new String(body, "UTF-8");
                    System.out.println("*********** Consumer1" + " get message :[" + msg + "]");
                }
            };
            // 6.消费消息
            channel.basicConsume(queueName, true, consumer);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TimeoutException e) {
            e.printStackTrace();
        }