rocketmq消息的简单示例

蔚落 2022-06-08 04:52 176阅读 0赞

# 简单信息示例 #

# 这个页面举例说明了这三种消息发送方式。结合笔记与示例一起找出哪种方式用于您的具体用例。 #

使用RocketMQ以三种方式发送消息：可靠的同步，可靠的异步和单向传输。

#### 可靠的同步传输 ####

应用：可靠的同步传输用于广泛的场景，如重要通知信息，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：单向传输用于要求中等可靠性的情况，如日志采集。

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();
        }
    }