文章目录

• 1、消费者组
• • 1.1、使用 efak 创建 主题 my_topic1 并建立6个分区并给每个分区建立3个副本
  • 1.2、创建生产者发送消息
  • 1.3、application.yml配置
  • 1.4、创建消费者监听器
  • 1.5、创建SpringBoot启动类
  • 1.6、屏蔽 kafka debug 日志 logback.xml
  • 1.7、引入spring-kafka依赖
  • 1.8、消费者控制台：

1、消费者组

1.1、使用 efak 创建 主题 my_topic1 并建立6个分区并给每个分区建立3个副本

1.2、创建生产者发送消息

package com.atguigu.spring.kafka.consumer;

import jakarta.annotation.Resource;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.kafka.core.KafkaTemplate;

@SpringBootTest
class SpringKafkaConsumerApplicationTests {
    @Resource
    KafkaTemplate kafkaTemplate;

    @Test
    void contextLoads() {
        for (int i = 0; i < 10; i++) {
            kafkaTemplate.send("my_topic1",i%6,"", "消费者组"+i);
        }
    }
}

1.3、application.yml配置

server:
  port: 8120

# v1
spring:
  Kafka:
    bootstrap-servers: 192.168.74.148:9095,192.168.74.148:9096,192.168.74.148:9097
    consumer:
      # read-committed读事务已提交的消息 解决脏读问题
      isolation-level: read-committed # 消费者的事务隔离级别：read-uncommitted会导致脏读，可以读取生产者事务还未提交的消息
      # 消费者是否自动ack ：true自动ack 消费者获取到消息后kafka提交消费者偏移量
      enable-auto-commit: true 
      # 消费者提交ack时多长时间批量提交一次
      auto-commit-interval: 1000
      # 消费者第一次消费主题消息时从哪个位置开始
      auto-offset-reset: earliest  #指定Offset消费:earliest | latest | none
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer

1.4、创建消费者监听器

package com.atguigu.spring.kafka.consumer.listener;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;
@Component
public class MyKafkaListener {
@KafkaListener(topics ={"my_topic1"},groupId = "my_group1")
public void onMessage1(ConsumerRecord<String, String> record) {
System.out.println("my_group1消费者1获取到消息：topic = "+ record.topic()
+"，partition:"+record.partition()
+"，offset = "+record.offset()
+"，key = "+record.key()
+"，value = "+record.value());
}
@KafkaListener(topics ={"my_topic1"},groupId = "my_group1")
public void onMessage2(ConsumerRecord<String, String> record) {
System.out.println("my_group1消费者2获取到消息：topic = "+ record.topic()
+"，partition:"+record.partition()
+"，offset = "+record.offset()
+"，key = "+record.key()
+"，value = "+record.value());
}
@KafkaListener(topics ={"my_topic1"},groupId = "my_group2")
public void onMessage3(ConsumerRecord<String, String> record) {
System.out.println("my_group2消费者获取到消息：topic = "+ record.topic()
+"，partition:"+record.partition()
+"，offset = "+record.offset()
+"，key = "+record.key()
+"，value = "+record.value());
}
}

1.5、创建SpringBoot启动类

package com.atguigu.spring.kafka.consumer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
// Generated by http://start.springboot.io
// 优质的 spring/boot/data/security/cloud 框架中文文档尽在 => http://springdoc.cn
@SpringBootApplication
public class SpringKafkaConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(SpringKafkaConsumerApplication.class, args);
}
}

1.6、屏蔽 kafka debug 日志 logback.xml

<configuration>　　　　　　

<logger name="org.apache.kafka.clients" level="debug" />
</configuration>

1.7、引入spring-kafka依赖

<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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.5</version>
<relativePath/> 
</parent>


<groupId>com.atguigu</groupId>
<artifactId>spring-kafka-consumer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-kafka-consumer</name>
<description>spring-kafka-consumer</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

1.8、消费者控制台：

  .   ____          _            __ _ _
/\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\/  ___)| |_)| | | | | || (_| |  ) ) ) )
'  |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot ::                (v3.0.5)
my_group2消费者获取到消息：topic = my_topic1，partition:2，offset = 0，key = ，value = 消费者组2
my_group2消费者获取到消息：topic = my_topic1，partition:2，offset = 1，key = ，value = 消费者组8
my_group2消费者获取到消息：topic = my_topic1，partition:0，offset = 0，key = ，value = 消费者组0
my_group2消费者获取到消息：topic = my_topic1，partition:0，offset = 1，key = ，value = 消费者组6
my_group2消费者获取到消息：topic = my_topic1，partition:5，offset = 0，key = ，value = 消费者组5
my_group2消费者获取到消息：topic = my_topic1，partition:3，offset = 0，key = ，value = 消费者组3
my_group2消费者获取到消息：topic = my_topic1，partition:3，offset = 1，key = ，value = 消费者组9
my_group2消费者获取到消息：topic = my_topic1，partition:1，offset = 0，key = ，value = 消费者组1
my_group2消费者获取到消息：topic = my_topic1，partition:1，offset = 1，key = ，value = 消费者组7
my_group2消费者获取到消息：topic = my_topic1，partition:4，offset = 0，key = ，value = 消费者组4
my_group1消费者2获取到消息：topic = my_topic1，partition:2，offset = 0，key = ，value = 消费者组2
my_group1消费者2获取到消息：topic = my_topic1，partition:2，offset = 1，key = ，value = 消费者组8
my_group1消费者1获取到消息：topic = my_topic1，partition:5，offset = 0，key = ，value = 消费者组5
my_group1消费者1获取到消息：topic = my_topic1，partition:4，offset = 0，key = ，value = 消费者组4
my_group1消费者1获取到消息：topic = my_topic1，partition:3，offset = 0，key = ，value = 消费者组3
my_group1消费者1获取到消息：topic = my_topic1，partition:3，offset = 1，key = ，value = 消费者组9
my_group1消费者2获取到消息：topic = my_topic1，partition:1，offset = 0，key = ，value = 消费者组1
my_group1消费者2获取到消息：topic = my_topic1，partition:1，offset = 1，key = ，value = 消费者组7
my_group1消费者2获取到消息：topic = my_topic1，partition:0，offset = 0，key = ，value = 消费者组0
my_group1消费者2获取到消息：topic = my_topic1，partition:0，offset = 1，key = ，value = 消费者组6