1.准备

本想改造第一篇，但是感觉改来改去，会越来越迷糊，索性就重新启个项目

第一篇说的是消息队列传输Json字符串，一般在企业中夸平台时常用，现在在说如何直接把传过来的json字符串反序列化成实体类

新建SpringBoot项目

2.集成RocketMQ

1）pom依赖引入

<dependencies>
        <!--rocketmq-->
        <dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-client</artifactId>
            <version>4.3.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

2）application.properties配置文件如下

（说明一下，除去端口号是系统中有的，其他均是生成后我们自己在类中方便引用的）

server.port=8088

rocketmq.producer.groupName=ProducerGroup
rocketmq.producer.namesrvAddr=127.0.0.1:9876
rocketmq.producer.instanceName=ProducerGroup
rocketmq.producer.topic=topic2020
rocketmq.producer.tag=test2020
rocketmq.producer.maxMessageSize=131072
rocketmq.producer.sendMsgTimeout=10000

rocketmq.consumer.namesrvAddr=127.0.0.1:9876
rocketmq.consumer.groupName=ConsumerGroup
rocketmq.consumer.topic=topic2020
rocketmq.consumer.tag=test2020
rocketmq.consumer.consumeThreadMin=20
rocketmq.consumer.consumeThreadMax=64
rocketmq.consumer.topic.topic=2020test
rocketmq.consumer.tag.tag=animal

3）创建实体类User、Animal

@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
public class User implements Serializable {

    private String name;

    private Integer age;

    private String sex;

}

@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
public class Animal implements Serializable {

    private String name;

    private Integer age;

}

4）引入序列胡及反序列化工具

package com.niuben.springboot.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

/**
 * Description：jackson序列化工具
 */
public class JsonUtils {

    public static final ObjectMapper MAPPER = new ObjectMapper();

    /**
     * 将对象转为json
     */
    public static String toJson(Object obj) {
        try {
            return MAPPER.writeValueAsString(obj);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 反序列化
     */
    public static <T> T fromJson(String json, Class<T> presentClass) {
        try {
            return MAPPER.readValue(json, presentClass);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}

5）创建MessageProcessor消息处理接口

package com.niuben.springboot.message;

import com.niuben.springboot.utils.JsonUtils;

public interface MessageProcessor<T> {

    boolean handle(T messageExt);

    Class<T> getPresentClass();

    // 将String类型的message反序列化成对应的对象
    default T transferMessage(String message) {
        return JsonUtils.fromJson(message, getPresentClass());
    }

}

6）实现MessageProcessorImpl消息处理类

本篇中用两到个2个实体类（就用2个实体类演示一下），在实现消息处理接口时，就实现2个

6.1）AnimalMessageProcessorImpl消息处理类

package com.niuben.springboot.message.impl;

import com.niuben.springboot.entity.Animal;
import com.niuben.springboot.message.MessageProcessor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

/**
 * Description：
 */
@Service
@Slf4j
public class AnimalMessageProcessorImpl implements MessageProcessor<Animal> {

    @Override
    public boolean handle(Animal animal) {
        log.info("接收Animal类消息：" + animal.toString());
        return true;
    }

    @Override
    public Class<Animal> getPresentClass() {
        return Animal.class;
    }
}

6.1）UserMessageProcessorImpl消息处理类

package com.niuben.springboot.message.impl;

import com.niuben.springboot.entity.User;
import com.niuben.springboot.message.MessageProcessor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

/**
 * Description：
 */
@Service
@Slf4j
public class UserMessageProcessorImpl implements MessageProcessor<User> {

    @Override
    public boolean handle(User user) {
        log.info("接收User类消息：" + user.toString());
        return true;
    }

    @Override
    public Class<User> getPresentClass() {
        return User.class;
    }
}

7）创建MessageListen消息监听类

package com.niuben.springboot.message;

import lombok.extern.slf4j.Slf4j;
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.common.message.MessageExt;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Description：监听类
 */
@Component
@Slf4j
public class MessageListen implements MessageListenerConcurrently {

    private Map<String, MessageProcessor> handleMap = new HashMap<>();

    // MessageProcessor消息处理接口的实现类放进Map集合
    // key:tag,value:MessageProcessor实体类
    public void registerHandler(String tags, MessageProcessor messageProcessor) {
        handleMap.put(tags, messageProcessor);
    }

    @SuppressWarnings("unchecked")
    @Override
    public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
        MessageExt ext = list.get(0);
        String message = new String(ext.getBody());
        // 获取到tag
        String tags = ext.getTags();
        // 根据tag获取到消息处理处理类
        MessageProcessor messageProcessor = handleMap.get(tags);

        Object obj = null;
        try {
            // 将String类型的message反序列化成对应的对象
            obj = messageProcessor.transferMessage(message);
        } catch (Exception e) {
            e.printStackTrace();
            log.error("反序列化失败");
        }
        // 消息处理
        boolean result = messageProcessor.handle(obj);
        if (!result) {
            return ConsumeConcurrentlyStatus.RECONSUME_LATER;
        }
        return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
    }

}

8）创建消息生产者RocketMQProducer

package com.niuben.springboot.consumer;

import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

/**
 * Description：生产者配置
 */
@Component
@Slf4j
public class RocketMQProducer {

    @Value("${rocketmq.producer.groupName}")
    private String groupName;

    @Value("${rocketmq.producer.namesrvAddr}")
    private String nameserAddr;

    @Value("${rocketmq.producer.instanceName}")
    private String instanceName;

    @Value("${rocketmq.producer.maxMessageSize}")
    private int maxMessageSize;

    @Value("${rocketmq.producer.sendMsgTimeout}")
    private int sendMsgTimeout;

    private DefaultMQProducer producer;

    @Bean
    public DefaultMQProducer getRocketMQProducer() {
        producer = new DefaultMQProducer(groupName);
        producer.setNamesrvAddr(nameserAddr);
        producer.setInstanceName(instanceName);
        producer.setMaxMessageSize(maxMessageSize);
        producer.setSendMsgTimeout(sendMsgTimeout);
        producer.setVipChannelEnabled(false);
        log.info("================>生产者创建完成，ProducerGroupName{}<================",groupName);
        return producer;
    }

}

9）创建消息消费者RocketMQConsumer

package com.niuben.springboot.consumer;

import com.niuben.springboot.message.MessageListen;
import com.niuben.springboot.message.impl.AnimalMessageProcessorImpl;
import com.niuben.springboot.message.impl.UserMessageProcessorImpl;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.exception.MQClientException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

/**
 * Description：消费者配置
 */
@Component
@Slf4j
public class RocketMQConsumer {

    @Autowired
    private MessageListen messageListen;

    @Autowired
    private UserMessageProcessorImpl userMessageProcessor;

    @Autowired
    private AnimalMessageProcessorImpl animalMessageProcessor;

    @Value("${rocketmq.consumer.namesrvAddr}")
    private String namesrvAddr;

    @Value("${rocketmq.consumer.groupName}")
    private String groupName;

    @Value("${rocketmq.consumer.topic}")
    private String topic;

    @Value("${rocketmq.consumer.tag}")
    private String tag;

    @Value("${rocketmq.consumer.consumeThreadMin}")
    private int consumeThreadMin;

    @Value("${rocketmq.consumer.consumeThreadMax}")
    private int consumeThreadMax;

    @Value("${rocketmq.consumer.topic.topic}")
    private String topic2;

    @Value("${rocketmq.consumer.tag.tag}")
    private String tag2;

    /**
     * 如果只想消费topic下的某几个tag，以用 “||”隔开。比如：consumer.subscribe("topic2020", "Tag1 || Tag2");
     * 如果想消费topic下所有的tag，用“*”。比如：consumer.subscribe("topic2020", "*");
     */

    @Bean
    public DefaultMQPushConsumer getRocketMQConsumer() {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(groupName);
        consumer.setNamesrvAddr(namesrvAddr);
        consumer.setConsumeThreadMin(consumeThreadMin);
        consumer.setConsumeThreadMax(consumeThreadMax);
        consumer.setVipChannelEnabled(false);

        messageListen.registerHandler(tag, userMessageProcessor);
        messageListen.registerHandler(tag2, animalMessageProcessor);
        consumer.registerMessageListener(messageListen);
        try {
            consumer.subscribe(topic, tag);
            consumer.subscribe(topic2, "*");
            log.info("===============>消费者创建完成，ConsumerGroupName:{}<==============", groupName);
            consumer.start();
            log.info("=====>消费者监听开始,groupName:{},topic:{},namesrvAddr:{}<=======", groupName, topic, namesrvAddr);
        } catch (MQClientException e) {
            log.error("======>消费者监听失败,groupName:{},topic:{},namesrvAddr:{}<======", groupName, topic, namesrvAddr, e);
            e.printStackTrace();
        }
        return consumer;
    }

}

10）创建controller类，RocketMqController

package com.niuben.springboot.controller;

import com.alibaba.fastjson.JSON;
import com.niuben.springboot.consumer.RocketMQProducer;
import com.niuben.springboot.entity.Animal;
import com.niuben.springboot.entity.User;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.common.message.Message;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Description：
 */
@RestController
@Slf4j
public class RocketMqController {

    @Autowired
    @Qualifier("rocketMQProducer")
    RocketMQProducer rocketMQProducer;

    @GetMapping("/test")
    public void TestSend() {
        DefaultMQProducer producer = rocketMQProducer.getRocketMQProducer();

        try {
            // 开启生产者
            producer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }

        User user = new User("小明", 20, "男");
        Message messageToUser = new Message("topic2020", "test2020", JSON.toJSONString(user).getBytes());
        try {
            producer.send(messageToUser);
        } catch (Exception e) {
            log.error("消息发送异常");
            e.printStackTrace();
        }

        Animal animal = new Animal("金毛", 3);
        Message messageToAnimal = new Message("2020test", "animal", JSON.toJSONString(animal).getBytes());
        try {
            producer.send(messageToAnimal);
        } catch (Exception e) {
            log.error("消息发送异常");
            e.printStackTrace();
        }

        // 关闭生产者
        producer.shutdown();
        log.info("生产者关闭");
    }

}

3.测试

1）首先启动本地RocketMQ（启动参考）

2）启动主启动类，在浏览器输入 localhost:8088/test，可以看到消费者已经创建并开始监听，并且已经消费消息

源码：https://gitee.com/niugit_admin/springboot-rocketmq-advanced

最简单的SpringBoot集成RocketMQ（二）进阶

1.准备

2.集成RocketMQ

3.测试

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