RocketMQ普通消息实战演练详解

public static void main(String[] args) throws Exception {
    //实例化消息生产者对象
    DefaultMQProducer producer = new DefaultMQProducer("group_luke");
    //设置NameSever地址
    producer.setNamesrvAddr("127.0.0.1:9876");
    //启动Producer实例
    producer.start();
    for (int i = 0; i < 10; i++) {
        Message msg = new Message("topic_luke", "tag", ("这是第"+i+"条消息。").getBytes(StandardCharsets.UTF_8));
        //同步发送方式
        SendResult send = producer.send(msg);
        //确认返回
        System.out.println(send);
    }
    //关闭producer
    producer.shutdown();
}

public static void main(String[] args) throws Exception {
    //实例化消息生产者对象
    DefaultMQProducer producer = new DefaultMQProducer("group_luke");
    //设置NameSever地址
    producer.setNamesrvAddr("127.0.0.1:9876");
    //启动Producer实例
    producer.start();
    for (int i = 0; i < 10; i++) {
        Message msg = new Message("topic_luke", "tag", ("这是第"+i+"条消息。").getBytes(StandardCharsets.UTF_8));
        //SendCallback会接收异步返回结果的回调
        producer.send(msg, new SendCallback() {
            @Override
            public void onSuccess(SendResult sendResult) {
                System.out.println(sendResult);
            }
            @Override
            public void onException(Throwable throwable) {
                throwable.printStackTrace();
            }
        });
    }
    //若是过早关闭producer，会抛出The producer service state not OK, SHUTDOWN_ALREADY的错
    Thread.sleep(10000);
    //关闭producer
    producer.shutdown();
}

public static void main(String[] args) throws Exception {
    //实例化消息生产者对象
    DefaultMQProducer producer = new DefaultMQProducer("group_luke");
    //设置NameSever地址
    producer.setNamesrvAddr("127.0.0.1:9876");
    //启动Producer实例
    producer.start();
    for (int i = 0; i < 10; i++) {
        Message msg = new Message("topic_luke", "tag", ("这是第"+i+"条消息。").getBytes(StandardCharsets.UTF_8));
        //同步发送方式
        producer.sendOneway(msg);
    }
    //关闭producer
    producer.shutdown();
}

public static void main(String[] args) throws Exception {
    //实例化消息消费者
    DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group_luke");
    //指定nameserver地址
    consumer.setNamesrvAddr("127.0.0.1:9876");
    //订阅topic,"*"表示所有tag
    consumer.subscribe("topic_luke","*");
    consumer.setMessageModel(MessageModel.CLUSTERING);
    // 注册回调实现类来处理从broker拉取回来的消息
    consumer.registerMessageListener(new MessageListenerConcurrently() {
        @SneakyThrows
        @Override
        public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
            for (MessageExt msg : msgs) {
                System.out.println(new String(msg.getBody()));
            }
            // 标记该消息已经被成功消费
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        }
    });
    // 启动消费者实例
    consumer.start();
    System.out.printf("Consumer Started.%n");
}

public static void main(String[] args) throws Exception {
    //实例化消息消费者
    DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group_luke");
    //指定nameserver地址
    consumer.setNamesrvAddr("127.0.0.1:9876");
    //订阅topic,"*"表示所有tag
    consumer.subscribe("topic_luke","*");
    consumer.setMessageModel(MessageModel.BROADCASTING);
    // 注册回调实现类来处理从broker拉取回来的消息
    consumer.registerMessageListener(new MessageListenerConcurrently() {
        @SneakyThrows
        @Override
        public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
            for (MessageExt msg : msgs) {
                System.out.println(new String(msg.getBody()));
            }
            // 标记该消息已经被成功消费
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        }
    });
    // 启动消费者实例
    consumer.start();
    System.out.printf("Consumer Started.%n");
}