SpringBoot整合RocketMQ

1.快速整合

1. 创建一个springboot项目，pom文件中引入RocketMQ关键依赖

注意：使用SpringBoot集成时，要非常注意版本

​
        
            org.apache.rocketmq
            rocketmq-spring-boot-starter
            2.2.2
            
                
                    org.apache.rocketmq
                    rocketmq-client
                
            
        
        
            org.apache.rocketmq
            rocketmq-client
            4.9.5
        

​

2. springboot的启动类

package com.roy.rocketmq;

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


@SpringBootApplication
public class RocketMQSBApplication {

    public static void main(String[] args) {
        SpringApplication.run(RocketMQSBApplication.class,args);
    }
}

 3. 在application.properties中写rocketMQ的配置

rocketmq.name-server=192.168.31.5:9876
#rocketmq.name-server=127.0.0.1:9876
rocketmq.producer.group=springBootGroup

#如果这里不配，那就需要在消费者的注解中配。
#rocketmq.consumer.topic=
rocketmq.consumer.group=testGroup
server.port=9000

4. 声明生产者，直接使用RocketMQTemplate进行消息发送。 

package com.roy.rocketmq.basic;

import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.spring.core.RocketMQTemplate;
import org.apache.rocketmq.spring.support.RocketMQHeaders;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;


@Component
public class SpringProducer {

    @Resource
    private RocketMQTemplate rocketMQTemplate;

       public SendResult sendMessage(String topic,String msg){
        SendResult sendResult = rocketMQTemplate.syncSend(topic, msg);
        return sendResult;
    }

    public void sendMessageInTransaction(String topic,String msg) throws InterruptedException {
        String[] tags = new String[] {"TagA", "TagB", "TagC", "TagD", "TagE"};
        for (int i = 0; i < 10; i++) {
            //尝试在Header中加入一些自定义的属性。
            Message message = MessageBuilder.withPayload(msg)
                    .setHeader(RocketMQHeaders.TRANSACTION_ID,"TransID_"+i)
                    //发到事务监听器里后，这个自己设定的TAGS属性会丢失。但是上面那个属性不会丢失。
                    .setHeader(RocketMQHeaders.TAGS,tags[i % tags.length])
                    //MyProp在事务监听器里也能拿到，为什么就单单这个RocketMQHeaders.TAGS拿不到？这只能去调源码了。
                    .setHeader("MyProp","MyProp_"+i)
                    .build();
            String destination =topic+":"+tags[i % tags.length];
            //这里发送事务消息时，还是会转换成RocketMQ的Message对象，再调用RocketMQ的API完成事务消息机制。
            SendResult sendResult = rocketMQTemplate.sendMessageInTransaction(destination, message,destination);
            System.out.printf("%s%n", sendResult);

            Thread.sleep(10);
        }
    }
}

5. 声明一个消费者

1.创建一个类实现RocketMQListener接口，注意泛型的使用，可以为具体的类型，如果想拿到消息的其他参数可以写成MessageExt
2.类上添加注解@Component和@RocketMQMessageListener
3.@RocketMQMessageListener(topic = "TestTopic", consumerGroup = "MyConsumerGroup")
4.topic指定消费的主题，consumerGroup指定消费组,一个主题可以有多个消费者组,一个消息可以被多个不同的组的消费者都消费

package com.roy.rocketmq.basic;

import org.apache.rocketmq.spring.annotation.ConsumeMode;
import org.apache.rocketmq.spring.annotation.ExtRocketMQConsumerConfiguration;
import org.apache.rocketmq.spring.annotation.MessageModel;
import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.stereotype.Component;

/**
 * 注意下@RocketMQMessageListener这个注解的其他属性
 **/
@Component
@RocketMQMessageListener(consumerGroup = "MyConsumerGroup", topic = "TestTopic",consumeMode= ConsumeMode.CONCURRENTLY,messageModel= MessageModel.BROADCASTING)
public class SpringConsumer implements RocketMQListener {
    @Override
    public void onMessage(String message) {
        System.out.println("Received message : "+ message);
    }
}

6. 写一个测试方法，测试发送一条消息

  @Resource
    private SpringProducer producer;

    @Test
    public void send()
    {
        SendResult test = producer.sendMessage("test", "hello,rocketMq...");
        System.out.println(test);
    }

 我们在MQ可视化管理平台上搜一下这个消息

7.  测试消费消息

启动项目，一直监听消息队列。一旦有消息发送则会消费消息。

 2. 各种消息类型处理示例

2.1 各种基础的消息发送机制

package com.roy.rocketmq;

import com.alibaba.fastjson.TypeReference;
import com.roy.rocketmq.domain.OrderPaidEvent;
import com.roy.rocketmq.domain.ProductWithPayload;
import com.roy.rocketmq.domain.User;
import org.apache.rocketmq.client.producer.SendCallback;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.spring.core.RocketMQLocalRequestCallback;
import org.apache.rocketmq.spring.core.RocketMQTemplate;
import org.apache.rocketmq.spring.support.RocketMQHeaders;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.util.MimeTypeUtils;

import javax.annotation.Resource;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;



@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringRocketTest {

    @Resource
    private RocketMQTemplate rocketMQTemplate;

    @Test
    public void sendMessageTest(){
        String springTopic="TestTopic";
        //发送字符消息
        SendResult sendResult = rocketMQTemplate.syncSend(springTopic, "Hello, World!");
        System.out.printf("syncSend1 to topic %s sendResult=%s %n", springTopic, sendResult);

        sendResult = rocketMQTemplate.syncSend(springTopic, new User().setUserAge((byte) 18).setUserName("Kitty"));
        System.out.printf("syncSend1 to topic %s sendResult=%s %n", springTopic, sendResult);

        sendResult = rocketMQTemplate.syncSend(springTopic, MessageBuilder.withPayload(
                new User().setUserAge((byte) 21).setUserName("Lester")).setHeader(MessageHeaders.CONTENT_TYPE, MimeTypeUtils.APPLICATION_JSON_VALUE).build());
        System.out.printf("syncSend1 to topic %s sendResult=%s %n", springTopic, sendResult);

        //发送对象消息
        rocketMQTemplate.asyncSend(springTopic, new OrderPaidEvent("T_001", new BigDecimal("88.00")), new SendCallback() {
            @Override
            public void onSuccess(SendResult var1) {
                System.out.printf("async onSucess SendResult=%s %n", var1);
            }

            @Override
            public void onException(Throwable var1) {
                System.out.printf("async onException Throwable=%s %n", var1);
            }
        });

        //发送指定TAG的消息
        rocketMQTemplate.convertAndSend(springTopic + ":tag0", "I'm from tag0");  // tag0 will not be consumer-selected
        System.out.printf("syncSend topic %s tag %s %n", springTopic, "tag0");
        rocketMQTemplate.convertAndSend(springTopic + ":tag1", "I'm from tag1");
        System.out.printf("syncSend topic %s tag %s %n", springTopic, "tag1");

        //同步发送消息并且返回一个String类型的结果。
        String replyString = rocketMQTemplate.sendAndReceive(springTopic, "request string", String.class);
        System.out.printf("send %s and receive %s %n", "request string", replyString);

        //同步发送消息并且返回一个Byte数组类型的结果。
        byte[] replyBytes = rocketMQTemplate.sendAndReceive(springTopic, MessageBuilder.withPayload("request byte[]").build(), byte[].class, 3000);
        System.out.printf("send %s and receive %s %n", "request byte[]", new String(replyBytes));

        //同步发送一个带hash参数的请求(排序消息)，并返回一个User类型的结果
        User requestUser = new User().setUserAge((byte) 9).setUserName("requestUserName");
        User requestUser2 = new User().setUserAge((byte) 9).setUserName("requestUserName");
        User requestUser3 = new User().setUserAge((byte) 9).setUserName("requestUserName");
        User requestUser4 = new User().setUserAge((byte) 9).setUserName("requestUserName");
        User replyUser = rocketMQTemplate.sendAndReceive(springTopic, requestUser, User.class, "order-id");
        User replyUser2 = rocketMQTemplate.sendAndReceive(springTopic, requestUser2, User.class, "order-id");
        User replyUser3 = rocketMQTemplate.sendAndReceive(springTopic, requestUser3, User.class, "order-id");
        User replyUser4 = rocketMQTemplate.sendAndReceive(springTopic, requestUser4, User.class, "order-id");
        System.out.printf("send %s and receive %s %n", requestUser, replyUser);
        //同步发送一个带延迟级别的消息(延迟消息)，并返回一个泛型结果
        ProductWithPayload replyGenericObject = rocketMQTemplate.sendAndReceive(springTopic, "request generic",
                new TypeReference>() {
                }.getType(), 30000, 2);
        System.out.printf("send %s and receive %s %n", "request generic", replyGenericObject);

        //异步发送消息，返回String类型结果。
        rocketMQTemplate.sendAndReceive(springTopic, "request string", new RocketMQLocalRequestCallback() {
            @Override public void onSuccess(String message) {
                System.out.printf("send %s and receive %s %n", "request string", message);
            }

            @Override public void onException(Throwable e) {
                e.printStackTrace();
            }
        });
        //异步发送消息，并返回一个User类型的结果。
        rocketMQTemplate.sendAndReceive(springTopic, new User().setUserAge((byte) 9).setUserName("requestUserName"), new RocketMQLocalRequestCallback() {
            @Override public void onSuccess(User message) {
                System.out.printf("send user object and receive %s %n", message.toString());
            }

            @Override public void onException(Throwable e) {
                e.printStackTrace();
            }
        }, 5000);
        //发送批量消息
        List msgs = new ArrayList();
        for (int i = 0; i < 10; i++) {
            msgs.add(MessageBuilder.withPayload("Hello RocketMQ Batch Msg#" + i).
                    setHeader(RocketMQHeaders.KEYS, "KEY_" + i).build());
        }

        SendResult sr = rocketMQTemplate.syncSend(springTopic, msgs, 60000);

        System.out.printf("--- Batch messages send result :" + sr);
    }
}

2.2 往多个topic发送消息

一个RocketMQTemplate实例只能包含一个生产者，也就只能往一个Topic下发送消息。如果需要往另外一个Topic下发送消息，就需要通过@ExtRocketMQTemplateConfiguration()注解另外声明一个子类实例。

package com.roy.rocketmq.config;

import org.apache.rocketmq.spring.annotation.ExtRocketMQConsumerConfiguration;
import org.apache.rocketmq.spring.annotation.ExtRocketMQTemplateConfiguration;
import org.apache.rocketmq.spring.core.RocketMQTemplate;


@ExtRocketMQTemplateConfiguration()
//@ExtRocketMQConsumerConfiguration(topic="stock_consumer_group")
public class ExtRocketMQTemplate extends RocketMQTemplate {
}

2.3 事务消息机制

        对于事务消息机制，最关键的事务监听器需要通过@RocketMQTransactionListener注解注入到Spring容器当中。在这个注解当中可以通过rocketMQTemplateBeanName属性，指向具体的RocketMQTemplate子类。

发送消息代码

   public void sendMessageInTransaction(String topic,String msg) throws InterruptedException {
        String[] tags = new String[] {"TagA", "TagB", "TagC", "TagD", "TagE"};
        for (int i = 0; i < 10; i++) {
            //尝试在Header中加入一些自定义的属性。
            Message message = MessageBuilder.withPayload(msg)
                    .setHeader(RocketMQHeaders.TRANSACTION_ID,"TransID_"+i)
                    //发到事务监听器里后，这个自己设定的TAGS属性会丢失。但是上面那个属性不会丢失。
                    .setHeader(RocketMQHeaders.TAGS,tags[i % tags.length])
                    //MyProp在事务监听器里也能拿到，为什么就单单这个RocketMQHeaders.TAGS拿不到？这只能去调源码了。
                    .setHeader("MyProp","MyProp_"+i)
                    .build();
            String destination =topic+":"+tags[i % tags.length];
            //这里发送事务消息时，还是会转换成RocketMQ的Message对象，再调用RocketMQ的API完成事务消息机制。
            SendResult sendResult = rocketMQTemplate.sendMessageInTransaction(destination, message,destination);
            System.out.printf("%s%n", sendResult);

            Thread.sleep(10);
        }
    }

监听事务代码： 

package com.roy.rocketmq.config;

import org.apache.commons.lang3.StringUtils;
import org.apache.rocketmq.spring.annotation.RocketMQTransactionListener;
import org.apache.rocketmq.spring.core.RocketMQLocalTransactionListener;
import org.apache.rocketmq.spring.core.RocketMQLocalTransactionState;
import org.apache.rocketmq.spring.support.RocketMQHeaders;
import org.apache.rocketmq.spring.support.RocketMQUtil;
import org.springframework.messaging.Message;
import org.springframework.messaging.converter.StringMessageConverter;

import java.util.concurrent.ConcurrentHashMap;

/**
 * @description: 事务消息监听器
 * 关于@RocketMQTransactionListener 这个注解，有点奇怪。2.0.4版本中，是需要指定txProducerGroup指向一个消息发送者组。不同的组可以有不同的事务消息逻辑。
 * 但是到了2.1.1版本，只能指定rocketMQTemplateBeanMame，也就是说如果你有多个发送者组需要有不同的事务消息逻辑，那就需要定义多个RocketMQTemplate。
 * 而且这个版本中，虽然重现了我们在原生API中的事务消息逻辑，但是测试过程中还是发现一些奇怪的特性，用的时候要注意点。
 **/
//@RocketMQTransactionListener(txProducerGroup = "springBootGroup2")
//@RocketMQTransactionListener(rocketMQTemplateBeanName = "ExtRocketMQTemplate")
@RocketMQTransactionListener()
public class MyTransactionImpl implements RocketMQLocalTransactionListener {

    private ConcurrentHashMap localTrans = new ConcurrentHashMap<>();
    @Override
    public RocketMQLocalTransactionState executeLocalTransaction(Message msg, Object arg) {
        Object transId = msg.getHeaders().get(RocketMQHeaders.PREFIX+RocketMQHeaders.TRANSACTION_ID);
        String destination = arg.toString();
        localTrans.put(transId,msg);
        //这个msg的实现类是GenericMessage，里面实现了toString方法

        //在Header中自定义的RocketMQHeaders.TAGS属性，到这里就没了。但是RocketMQHeaders.TRANSACTION_ID这个属性就还在。
        //而message的Header里面会默认保存RocketMQHeaders里的属性，但是都会加上一个RocketMQHeaders.PREFIX前缀
        System.out.println("executeLocalTransaction msg = "+msg);
        //转成RocketMQ的Message对象
        org.apache.rocketmq.common.message.Message message = RocketMQUtil.convertToRocketMessage(new StringMessageConverter(),"UTF-8",destination, msg);
        String tags = message.getTags();
        if(StringUtils.contains(tags,"TagA")){
            return RocketMQLocalTransactionState.COMMIT;
        }else if(StringUtils.contains(tags,"TagB")){
            return RocketMQLocalTransactionState.ROLLBACK;
        }else{
            return RocketMQLocalTransactionState.UNKNOWN;
        }
    }
    //延迟检查的时间间隔
    @Override
    public RocketMQLocalTransactionState checkLocalTransaction(Message msg) {
        String transId = msg.getHeaders().get(RocketMQHeaders.PREFIX+RocketMQHeaders.TRANSACTION_ID).toString();
        Message originalMessage = localTrans.get(transId);
        //这里能够获取到自定义的transaction_id属性
        System.out.println("checkLocalTransaction msg = "+originalMessage);
        //获取标签时，自定义的RocketMQHeaders.TAGS拿不到，但是框架会封装成一个带RocketMQHeaders.PREFIX的属性
//        String tags = msg.getHeaders().get(RocketMQHeaders.TAGS).toString();
        String tags = msg.getHeaders().get(RocketMQHeaders.PREFIX+RocketMQHeaders.TAGS).toString();
        if(StringUtils.contains(tags,"TagC")){
            return RocketMQLocalTransactionState.COMMIT;
        }else if(StringUtils.contains(tags,"TagD")){
            return RocketMQLocalTransactionState.ROLLBACK;
        }else{
            return RocketMQLocalTransactionState.UNKNOWN;
        }
    }
}