RocketMq在java中的应用（三） RocketMq的单机安装（一）

RocketMq的单机安装（一）：https://www.cnblogs.com/simplefuer/p/12192984.html

完成RocketMq的安装后，需要对rocketMq进行本地测试，java代码如下：

Producer（生产者）：

import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;

public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {

        /***
         * 需要一个producerGroup 名字作为构造方法的参数，可自定义
         */
        DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName1");
        producer.setNamesrvAddr("*****:9876");//外网地址
        producer.start();

        for (int i = 0; i < 128; i++)
            try {
                {
                    Message msg = new Message("TopicTest",//主题
                        "TagA",
                        "OrderID188",
                        "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET))//发送的内容;
                    SendResult sendResult = producer.send(msg);
                    System.out.printf("%s%n", sendResult);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        producer.shutdown();
    }
}

运行结果：

Connected to the target VM, address: '127.0.0.1:64374', transport: 'socket'
16:17:20.502 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework
SendResult [sendStatus=SEND_OK, msgId=C0A8014221A818B4AAC24B97D4C70000, offsetMsgId=79296EE100002A9F000000000002320C, messageQueue=MessageQueue [topic=TopicTest1, brokerName=broker-a, queueId=3], queueOffset=32]
SendResult [sendStatus=SEND_OK, msgId=C0A8014221A818B4AAC24B97D5150001, offsetMsgId=79296EE100002A9F00000000000232E1, messageQueue=MessageQueue [topic=TopicTest1, brokerName=broker-a, queueId=0], queueOffset=32]
SendResult [sendStatus=SEND_OK, msgId=C0A8014221A818B4AAC24B97D5370002, offsetMsgId=79296EE100002A9F00000000000233B6, messageQueue=MessageQueue [topic=TopicTest1, brokerName=broker-a, queueId=1], queueOffset=32]
SendResult [sendStatus=SEND_OK, msgId=C0A8014221A818B4AAC24B97D5600003, offsetMsgId=79296EE100002A9F000000000002348B, messageQueue=MessageQueue [topic=TopicTest1, brokerName=broker-a, queueId=2], queueOffset=32]
SendResult [sendStatus=SEND_OK, msgId=C0A8014221A818B4AAC24B97D5810004, offsetMsgId=79296EE100002A9F0000000000023560, messageQueue=MessageQueue [topic=TopicTest1, brokerName=broker-a, queueId=3], queueOffset=33]

Consumer（消费者）：

import java.util.List;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;

public class Consumer {
    public static void main(String[] args) {
        /**
         * Instantiate with specified consumer group name.
         */
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("ProducerGroupName");
        consumer.setNamesrvAddr("121.41.110.225:9876");
        /**
         * 指定name server的地址.
         * <p/>
         *
         * 或者你可以通过环境变量指定name server地址: NAMESRV_ADDR
         * <pre>
         * {@code
         * consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
         * }
         * </pre>
         */

        /**
         * 指定从哪里开始，以防指定的消费群体是一个全新的消费群体.
         */
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);

        /**
         * 订阅主题来消费.
         */
        try {
            consumer.subscribe("TopicTest", "*");
        } catch (MQClientException e) {
            e.printStackTrace();
        }

        /**
         *  Register callback to execute on arrival of messages fetched from brokers.
         */
        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext context) throws InterruptedException {
                for (MessageExt ext : msgs) {
                    String result = new String(ext.getBody());
//                    Thread.sleep(10000);
                    System.out.println(result);
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        }) ;

        /**
         *  启动消费者实例.
         */
        try {
            consumer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }

        System.out.printf("Consumer Started.%n");
    }
}

运行结果：

Connected to the target VM, address: '127.0.0.1:64630', transport: 'socket'
16:32:39.716 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework
Consumer Started.
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world
Hello world

注意：Producer和Consumer的topic需要一致。