Apache RocketMQ：简单消息示例

小鱼儿 2022-02-01 14:39 216阅读 0赞

通过三种方式来发送RocketMQ消息使用: 可靠的同步发送, 可靠的异步发送和单向传输。

这个页面举例说明了这三种消息发送方式. 根据示例找出最适合你的特定用例。

可靠的同步传输

应用：可靠的同步传输广泛应用于重要通知消息，短信通知，短信营销系统等..

public class SyncProducer {
        public static void main(String[] args) throws Exception {
            //Instantiate with a producer group name.
            DefaultMQProducer producer = new
                DefaultMQProducer("please_rename_unique_group_name");
            //Launch the instance.
            producer.start();
            for (int i = 0; i < 100; i++) {
                //Create a message instance, specifying topic, tag and message body.
                Message msg = new Message("TopicTest" /* Topic */,
                    "TagA" /* Tag */,
                    ("Hello RocketMQ " +
                        i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
                );
                //Call send message to deliver message to one of brokers.
                SendResult sendResult = producer.send(msg);
                System.out.printf("%s%n", sendResult);
            }
            //Shut down once the producer instance is not longer in use.
            producer.shutdown();
        }
    }

可靠的异步传输

应用：异步传输通常用于响应时间敏感的业务场景。

public class AsyncProducer {
        public static void main(String[] args) throws Exception {
            //Instantiate with a producer group name.
            DefaultMQProducer producer = new DefaultMQProducer("ExampleProducerGroup");
            //Launch the instance.
            producer.start();
            producer.setRetryTimesWhenSendAsyncFailed(0);
            for (int i = 0; i < 100; i++) {
                    final int index = i;
                    //Create a message instance, specifying topic, tag and message body.
                    Message msg = new Message("TopicTest",
                        "TagA",
                        "OrderID188",
                        "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
                    producer.send(msg, new SendCallback() {
                        @Override
                        public void onSuccess(SendResult sendResult) {
                            System.out.printf("%-10d OK %s %n", index,
                                sendResult.getMsgId());
                        }
                        @Override
                        public void onException(Throwable e) {
                            System.out.printf("%-10d Exception %s %n", index, e);
                            e.printStackTrace();
                        }
                    });
            }
            //Shut down once the producer instance is not longer in use.
            producer.shutdown();
        }
    }

单向传输

应用：单向传输用于需要中等可靠性的情况，例如日志收集.

public class OnewayProducer {
        public static void main(String[] args) throws Exception{
            //Instantiate with a producer group name.
            DefaultMQProducer producer = new DefaultMQProducer("ExampleProducerGroup");
            //Launch the instance.
            producer.start();
            for (int i = 0; i < 100; i++) {
                //Create a message instance, specifying topic, tag and message body.
                Message msg = new Message("TopicTest" /* Topic */,
                    "TagA" /* Tag */,
                    ("Hello RocketMQ " +
                        i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
                );
                //Call send message to deliver message to one of brokers.
                producer.sendOneway(msg);
    
            }
            //Shut down once the producer instance is not longer in use.
            producer.shutdown();
        }
    }

转自 [并发编程网 – ifeve.com][_ ifeve.com]  **地址:** [《Apache RocketMQ用户指南》之简单消息示例][Apache RocketMQ]

更多 RocketMQ的经典文章：[《Apache RocketMQ用户指南》官方文档][Apache RocketMQ 1]

[_ ifeve.com]: http://ifeve.com/
[Apache RocketMQ]: http://ifeve.com/%E3%80%8Aapache-rocketmq%E7%94%A8%E6%88%B7%E6%8C%87%E5%8D%97%E3%80%8B%E4%B9%8B%E7%AE%80%E5%8D%95%E6%B6%88%E6%81%AF%E7%A4%BA%E4%BE%8B/
[Apache RocketMQ 1]: http://ifeve.com/%E3%80%8Aapache-rocketmq%E7%94%A8%E6%88%B7%E6%8C%87%E5%8D%97%E3%80%8B%E5%AE%98%E6%96%B9%E6%96%87%E6%A1%A3/