rocketMQ-java快通跑通

# 一. 如何查看rocketmq服务是否启动

以下有几种方法：

检查RocketMQ的启动日志：RocketMQ在启动过程中会生成日志文件，通常位于RocketMQ安装目录下的logs文件夹中。打开启动日志文件，查看其中的信息，特别是最后几行，以确定是否成功启动。
检查RocketMQ的进程：在Linux或Unix系统中，可以使用以下命令检查RocketMQ的进程是否在运行：

ps -ef | grep NamesrvStartup  # 检查Namesrv进程
ps -ef | grep BrokerStartup   # 检查Broker进程

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如果能够找到与NamesrvStartup或BrokerStartup相关的进程信息，则表示RocketMQ已成功启动。

检查RocketMQ的端口是否监听：RocketMQ的Namesrv和Broker分别使用不同的端口进行通信。你可以使用以下命令检查相关端口是否被监听：

netstat -tln | grep 9876  # 检查Namesrv的监听端口，默认为9876
netstat -tln | grep 10911  # 检查Broker的监听端口，默认为10911

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如果命令输出显示相关端口处于LISTEN状态，说明RocketMQ已成功启动并正在监听相应的端口。

测试RocketMQ的功能：你可以使用RocketMQ提供的命令行工具或客户端程序测试其功能是否正常。例如，你可以使用RocketMQ提供的命令行工具mqadmin发送和接收消息，或者使用客户端程序连接到RocketMQ并进行消息的发送和接收操作。如果这些操作都能够正常执行，说明RocketMQ已成功启动。

# 二. java maven依赖

<dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-client</artifactId>
            <version>5.1.3</version>
</dependency>

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# 三.生产者与消费者

生产者

package org.zj.producer;

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

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class AsyncProducer {

    public static final int MESSAGE_COUNT = 1000;
    public static final String PRODUCER_GROUP = "group_test";
    public static final String DEFAULT_NAMESRVADDR = "127.0.0.1:9876";
    public static final String TOPIC = "Topic_ASYNC";
    public static final String TAG = "TagA";

    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer(PRODUCER_GROUP);
        producer.setNamesrvAddr(DEFAULT_NAMESRVADDR);
        producer.start();
        producer.setRetryTimesWhenSendAsyncFailed(0);

        final CountDownLatch countDownLatch = new CountDownLatch(MESSAGE_COUNT);
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            try {
                final int index = i;
                Message msg = new Message(TOPIC, TAG, "order", "Hello World".getBytes(RemotingHelper.DEFAULT_CHARSET));
                producer.send(msg, new SendCallback() {

                    @Override
                    public void onSuccess(SendResult sendResult) {
                        countDownLatch.countDown();
                        System.out.printf("%-10d OK %s %n", index, sendResult.getMsgId());
                    }

                    @Override
                    public void onException(Throwable throwable) {
                        countDownLatch.countDown();
                        System.out.printf("%-10d Exception %s %n", index, throwable);
                        throwable.printStackTrace();
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        countDownLatch.await(5, TimeUnit.SECONDS);
        producer.shutdown();
    }
}

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消费者

package org.zj.consumer;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;

public class Consumer {
    public static final String CONSUMER_GROUP = "group_test";
    public static final String DEFAULT_NAMESRVADDR = "127.0.0.1:9876";
    public static final String TOPIC_1 = "Topic_ASYNC";
    public static final String TOPIC_2 = "Topic_SYNC";
    public static final String TOPIC_3 = "Topic_ONE_WAY";



    public static void main(String[] args) throws Exception{

        // 初始化一个确切的消费者组
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(CONSUMER_GROUP);

        // nameserver服务地址
        consumer.setNamesrvAddr(DEFAULT_NAMESRVADDR);

        /**
         * 消费最新消息
         * CONSUME_FROM_LAST_OFFSET,
         * 从头开始消费
         *CONSUME_FROM_FIRST_OFFSET,
         *CONSUME_FROM_TIMESTAMP;
         */
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);

        // 订阅主题
        consumer.subscribe(TOPIC_1, "*");
        consumer.subscribe(TOPIC_2, "*");
        consumer.subscribe(TOPIC_3, "*");

        // 注册回调函数
        consumer.registerMessageListener((MessageListenerConcurrently) (list, consumeConcurrentlyContext) -> {
            System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), list);
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        });

        // 初始化消费者
        consumer.start();

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

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参考： Client SDK (opens new window)

编辑

上次更新: 2024/02/22, 14:03:19

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