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 = newDefaultMQProducer("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() {@Overridepublic void onSuccess(SendResult sendResult) {System.out.printf("%-10d OK %s %n", index,sendResult.getMsgId());}@Overridepublic 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 地址: 《Apache RocketMQ用户指南》之简单消息示例
更多 RocketMQ的经典文章：《Apache RocketMQ用户指南》官方文档
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