kafka-消耗者组（SpringBoot整合Kafka）
1、消耗者组1.1、利用 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
https://img-blog.csdnimg.cn/direct/348d48e4928348fd9a7f81c7d9f42528.png
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);
}
}
}
https://img-blog.csdnimg.cn/direct/a884d62a29cd4cb18495ad25212738b4.png
https://img-blog.csdnimg.cn/direct/fabd9f0faadd4cf6b5f1b495a439cb1c.png
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、创建消耗者监听器
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 https://start.springboot.io
// 优质的 spring/boot/data/security/cloud 框架中文文档尽在 => https://springdoc.cn
@SpringBootApplication
public class SpringKafkaConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(SpringKafkaConsumerApplication.class, args);
}
}
1.6、屏蔽 kafka debug 日记 logback.xml
<configuration>
<!-- 如果觉得idea控制台日志太多，src\main\resources目录下新建logback.xml
屏蔽kafka debug -->
<logger name="org.apache.kafka.clients" level="debug" />
</configuration>
1.7、引入spring-kafka依靠
<?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 https://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/> <!-- lookup parent from repository -->
</parent>
<!-- Generated by https://start.springboot.io -->
<!-- 优质的 spring/boot/data/security/cloud 框架中文文档尽在 => https://springdoc.cn -->
<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、消耗者控制台：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ ____ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/___)| |_)| | | | | || (_| |) ) ) )
'|____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: 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
https://img-blog.csdnimg.cn/direct/73f7488f71124865a9d400839c109a43.png
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