前期准备安装kafka
启动Kafka本地环境需Java 8+以上
Kafka是一种高吞吐量的分布式发布订阅消息系统，它可以处理消费者在网站中的所有动作流数据。
Kafka启动方式有Zookeeper和Kraft，两种方式只能选择其中一种启动，不能同时使用。
Kafka下载https://downloads.apache.org/kafka/3.7.0/kafka_2.13-3.7.0.tgz
解压tar -xzf kafka_2.13-3.7.0.tgz
一、Zookeeper启动Kafka（kafka内置zookeeper）
Kafka依赖Zookeeper
1、启动Zookeeper 2、启动Kafka
使用kafka自带Zookeeper启动
./zookeeper-server-start.sh ../config/zookeeper.properties &
./zookeeper-server-stop.sh ../config/zookeeper.properties
./kafka-server-start.sh ../config/server.properties &
./kafka-server-stop.sh ../config/server.properties
二、Zookeeper服务器启动Kafka
Zookeeper服务器安装
https://zookeeper.apache.org/
https://dlcdn.apache.org/zookeeper/zookeeper-3.9.2/apache-zookeeper-3.9.2-bin.tar.gz
tar zxvf apache-zookeeper-3.9.2-bin.tar.gz
配置Zookeeper服务器
cp zoo_sample.cfg zoo.cfg
启动Zookeeper服务器
./zkServer.sh start
修改Zookeeper端口
Zoo.cfg添加内容
admin.serverPort=8099
apache-zookeeper-3.9.2-bin/bin目录下重启Zookeeper
Zookeeper服务器启动kafka
/opt/kafka_2.13-3.7.0/bin目录下
./kafka-server-start.sh ../config/server.properties &
Kafka配置文件server.properties
三、使用KRaft启动Kafka
UUID通用唯一识别码（Universally Unique Identifier）
1、生成Cluster UUID(集群UUID)：./kafka-storage.sh random-uuid
2.格式化kafka日志目录：./kafka-storage.sh format -t 3pMJGNJcT0uLIBsZhbucjQ -c ../config/kraft/server.properties
3.启动kafka：./kafka-server-start.sh ../config/kraft/server.properties &
springboot集成kafka
创建topic时，若不指定topic的分区(partition)数量使，则默认为1个分区(partition)
修改server.properties文件
vim server.properties
listeners=PLAINTEXT://0.0.0.0:9092
advertised.listeners=PLAINTEXT://192.168.68.133:9092
springboot加入依赖kafka
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
加入spring-kafka依赖后，springboot自动装配好kafkaTemplate的Bean
application.yml配置连接kafka
spring:
kafka:
bootstrap-servers: 192.168.68.133:9092
生产者
发送消息
@Resource
private KafkaTemplate<String,String> kafkaTemplate;
@Test
void kafkaSendTest(){
kafkaTemplate.send("kafkamsg01","hello kafka");
}
消费者
接收消息
@Component
public class KafkaConsumer {
@KafkaListener(topics = {"kafkamsg01","test"},groupId = "123")
public void consume(String message){
System.out.println("接收到消息："+message);
}
}
若没有配置groupid
Failed to start bean 'org.springframework.kafka.config.internalKafkaListenerEndpointRegistry'; nested exception is java.lang.IllegalStateException: No group.id found in consumer config, container properties, or @KafkaListener annotation; a group.id is required when group management is used.
@Component
public class KafkaConsumer {
@KafkaListener(topics = {"kafkamsg01","test"},groupId = "123")
public void consume(String message){
System.out.println("接收到消息："+message);
}
}
