【Spring Boot】集成Kafka实现消息发送和订阅-Toy模板网

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一，新建Spring Boot

最近忙着搞低代码开发，好久没新建spring项目了，结果今天心血来潮准备建个springboot项目
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列
注意Type选Maven，java选8，其他默认

1，Maven配置

点下一步后完成就新建了一个spring boot项目，配置下Maven环境，主要是settings.xml文件，里面要包含阿里云仓库，不然可能依赖下载不下来
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列

2，无法识别为SpringBoot项目

在maven配置没问题的前提下，IDEA无法识别这是一个Spring Boot项目，倒腾半天，终于发现问题原因所在=======>是Maven版本太高的原因
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列
把.mvn/wrapper目录下的maven-wrapper.properties文件第一行的版本号降低，比如说降为3.5.4，然后重新点下Maven的同步按钮

3，无效的源发行版

接下来运行项目报错：java: 无效的源发行版: 14
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列
修改pom.xml中java.version值为8，原来是17

	<properties>
        <java.version>17</java.version>
    </properties>

4，无法访问SpringApplication

继续运行，继续报错【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列
降低spring-boot-starter-parent版本，原来是3.1.3，改为2.7.2

5，运行直接Finish

继续运行，没报错，服务直接Finished
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列
需要添加web依赖

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

6，服务运行成功

终于，一个空的spring boot项目成功跑起来了，喜极而泣
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列

二，安装启动Kafka

1，下载

官网=>https://kafka.apache.org/downloads，下载最新版的kafka，目前是3.5.1
【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列

2，配置

解压到D盘Config目录下即完成安装，目录为D:\Config\kafka_2.13-3.5.1
修改配置文件
(1) server.properties

broker.id=1
log.dirs=/Config/kafka_2.13-3.5.1/logs-kafka

(2) zookeeper.properties

dataDir=/Config/kafka_2.13-3.5.1/logs-zookeeper

3，启动

先启动zookeeper

bin\windows\zookeeper-server-start.bat config\zookeeper.properties

再启动kafka

bin\windows\kafka-server-start.bat config\server.properties

停止的时候，先停止kafka，再停止zookeeper，直接ctrl+c停止

4，其他命令

1，查看topic列表

bin\windows\kafka-topics.bat --list --bootstrap-server localhost:9092

2，查看topic具体信息

bin\windows\kafka-topics.bat --describe --bootstrap-server localhost:9092 --topic test

3，创建topic

bin\windows\kafka-topics.bat --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test

三，生产消费消息

1，加入依赖

 		<dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>

2，yam配置文件

application.yaml

spring:
  profiles:
    active: dev

application-dev.yaml

server:
  port: 8082
  servlet:
    context-path: /test-kafka

spring:
  cache:
    type: ehcache
    config: classpath:ehcache.xml
  jpa:
    database-platform: com.enigmabridge.hibernate.dialect.SQLiteDialect
  kafka:
    bootstrap-servers: 127.0.0.1:9092
    consumer:
      group-id: kafka-demo-kafka-group
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer 
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer 
    producer:
      key-serializer: org.apache.kafka.common.serialization.StringSerializer 
      value-serializer: org.apache.kafka.common.serialization.StringSerializer 
      retries: 10

3，报错enabled mechanisms are []

Connection to node -1 (activate.navicat.com/127.0.0.1:9092) failed authentication due to: Unexpected handshake request with client mechanism PLAIN, enabled mechanisms are []

【Spring Boot】集成Kafka实现消息发送和订阅,后端,spring boot,kafka,后端,订阅,消息队列
这个错误我本地测试下来是因为没把账号密码配置这块注释掉

4，生产者生产消息

@Slf4j
@Component
public class KafkaProducer {
    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    public String sendMessage(String content) {
        String topic = "test_topic";
        kafkaTemplate.send(topic, content).addCallback(success -> {
            String topic = success.getRecordMetadata().topic();
            int partition = success.getRecordMetadata().partition();
            long offset = success.getRecordMetadata().offset();
            log.info("发送成功：主题：{}，分区：{}，偏移量：{}",topic,partition,offset);
        }, failure -> {
            log.info("发送失败：{}",failure.getMessage());
        });
        return "发送成功";
    }
}

5，订阅和消费消息

一，订阅主题
1，获取消费者

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

import java.util.Properties;

/**
 * kafka消费者配置
 * @author liuxunming
 */
@Configuration
@Component
public class KafkaConfig {
    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Value("${spring.kafka.consumer.group-id}")
    private String groupId;

    @Value("${spring.kafka.consumer.key-deserializer}")
    private String keyDeserializer;

    @Value("${spring.kafka.consumer.value-deserializer}")
    private String valueDeserializer;

    public KafkaConsumer<String, String> createConsumer() {

        Properties props = new Properties();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, keyDeserializer);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, valueDeserializer);
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");

        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        return consumer;
    }

}

2，订阅topic

 		KafkaConsumer<String, String> consumer = kafkaConfig.createConsumer();
        consumer.subscribe(Collections.singleton("traffic"));

3，拉取消息

 ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
 for (ConsumerRecord<String, String> record : records) {
		String key = record.key();
		String value = record.value();
		log.info("\n收到消息key=>{}\n收到消息value=>{}",key,value);
}

4，消费位移，释放资源

// 提交消费位移
consumer.commitSync();
// 关闭消费者以释放资源
consumer.close();

二，点对点模式

@Slf4j
@Component
public class KafkaConsumer {
    @KafkaListener(topics = {"test_topic"})
    public void handlerMsg(String content) {
        log.info("接收到消息：消息值：{} ",content);
    }
}

6，接口

@Slf4j
@RestController
public class KafkaController {

    @Autowired
    private KafkaProducer kafkaProducer;

    @PostMapping("/sendMessage")
    public String sendMessage(@RequestParam String content) {
        kafkaProducer.sendMessage(content);
        return "ok";
    }
}