RabbitMQ的发布订阅消息模型——广播

发消息：

public class Send {
    private final static String EXCHANGE_NAME  = "exchange_fanout";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("81.71.147.62");
        factory.setUsername("");
        factory.setPassword("");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);
        try (   //JDK7语法 或自动关闭 connnection和channel
                //创建连接
                Connection connection = factory.newConnection();
                //创建信道
                Channel channel = connection.createChannel()) {
            //绑定交换机,fanout扇形，即广播类型
            channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);

            String message = "Hello World pub !";
            channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes(StandardCharsets.UTF_8));
            System.out.println(" [x] Sent '" + message + "'");

        }
    }
}

public class Recv1 {

    private final static String EXCHANGE_NAME = "exchange_fanout";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("81.71.147.62");
        factory.setUsername("");
        factory.setPassword("");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);

        //消费者一般不增加自动关闭
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        //绑定交换机,fanout扇形，即广播类型
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);

        //获取队列（排它队列）
        String queueName = channel.queueDeclare().getQueue();

        //绑定队列和交换机,fanout交换机不用指定routingkey
        channel.queueBind(queueName,EXCHANGE_NAME,"");


        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");
        };

        //自动确认消息
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });

    }
}