【RocketMq实战第二篇】-SpringBoot集成RocketMq

前言

本文笔者是一波三折啊，很多人像我一样第一次在springboot里搞rocketmq的，遇到各种麻烦，我也是一样，就比如：

踩坑：

• nameserver启动成功了，broker启动失败，然后broker日志文件没有生成，错误原因也找不到。
• 在java里发送消息时发送失败，幸好有报错信息[Send [3] times, still failed]，就是重发三次也没发出去的意思。网上资料说是broker启动方式不对，然而并没有解决
• ……

 

本文是简单的使用发送消息和消费消息，让大家了解一下流程。

正文

在此之前我们要启动一个nameserver和一个broker

上文我已经介绍了，链接如下：启动消息服务

 

第一步

创建一个maven项目，pom文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>rocketmq_demo</groupId>
    <artifactId>rocketmq_demo</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-tools</artifactId>
            <version>4.2.0</version>
        </dependency>
    </dependencies>
</project>

 

第二步

创建启动类，RocketMQApp，这个启动类当作生产者

package com;

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;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author yanlin
 * @version v1.3
 * @date 2019-01-24 3:43 PM
 * @since v8.0
 **/
@SpringBootApplication
public class RocketMQApp {
    public static void main(String[] args) throws MQClientException, InterruptedException {
        SpringApplication.run(RocketMQApp.class, args);
        DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
        producer.setNamesrvAddr("127.0.0.1:9876");
        producer.start();
        for (int i = 0; i < 20; i++) {
            try {
                Message msg = new Message("TopicTest" /* Topic */,
                        "TagA" /* Tag */,
                        ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
                );
                SendResult sendResult = producer.send(msg);
                System.out.printf("%s%n", sendResult);
            } catch (Exception e) {
                e.printStackTrace();
                Thread.sleep(1000);
            }
        }
        producer.shutdown();
    }
}

 

第三步

创建消费者 RocketMQConsumer，代码如下

package com.rocketmq;

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.Messa