消息中间件 - 原生Java客户端进行消息通信(Fanut模式)（十九）

原创

日薪灬越亿 2022-11-30 14:20:22 博主文章分类：消息中间件 ©著作权

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消息广播到绑定的队列

参见代码no-spring模块包cn.enjoyedu.exchange.fanout中：

通过测试表明，不管我们如何调整生产者和消费者的路由键，都对消息的接受没有影响。

消费者：

public class Consumer1 {

    public static void main(String[] argv) throws IOException,
            InterruptedException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("127.0.0.1");

        // 打开连接和创建频道，与发送端一样
        Connection connection = factory.newConnection();
        final Channel channel = connection.createChannel();

        channel.exchangeDeclare(FanoutProducer.EXCHANGE_NAME,
                BuiltinExchangeType.FANOUT);
        // 声明一个随机队列
        String queueName = channel.queueDeclare().getQueue();

        //所有日志严重性级别
        String[] severities={"error","info","warning"};
        for (String severity : severities) {
            //关注所有级别的日志（多重绑定）
            channel.queueBind(queueName, FanoutProducer.EXCHANGE_NAME,
                    severity);
        }
        System.out.println(" [*] Waiting for messages:");

        // 创建队列消费者
        final Consumer consumerA = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope,
                                       AMQP.BasicProperties properties, byte[] body)
                    throws IOException {
                String message = new String(body, "UTF-8");
                System.out.println(" Received "  + envelope.getRoutingKey() + "':'" + message + "'");
            }
        };
        channel.basicConsume(queueName, true, consumerA);
    }
}

消费者2:

//只关注error级别的日志，然后记录到文件中去
        //只关注error级别的日志，然后记录到文件中去。
        String severity="test";
        channel.queueBind(queueName, FanoutProducer.EXCHANGE_NAME,
                severity);

        System.out.println(" [*] Waiting for messages......");

生产者：

public class FanoutProducer {

    public final static String EXCHANGE_NAME = "fanout_logs";

    public static void main(String[] args) throws IOException, TimeoutException {
        /**
         * 创建连接连接到MabbitMQ
         */
        ConnectionFactory factory = new ConnectionFactory();
        // 设置MabbitMQ所在主机ip或者主机名
        factory.setHost("127.0.0.1");

        // 创建一个连接
        Connection connection = factory.newConnection();

        // 创建一个信道
        Channel channel = connection.createChannel();
        // 指定转发
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);

        String queueName = "producer_create";
        channel.queueDeclare(queueName,false,false,
                false,null);
        channel.queueBind(queueName,EXCHANGE_NAME,"test");

        //所有日志严重性级别
        String[] severities={"error","info","warning"};
        for(int i=0;i<3;i++){
            String severity = severities[i%3];//每一次发送一条不同严重性的日志

            // 发送的消息
            String message = "Hello World_"+(i+1);
            //参数1：exchange name
            //参数2：routing key
            channel.basicPublish(EXCHANGE_NAME, severity,
                    null, message.getBytes());
            System.out.println(" [x] Sent '" + severity +"':'"
                    + message + "'");
        }
        // 关闭频道和连接
        channel.close();
        connection.close();
    }

}