轻松上手 Spring Boot & Kafka 实战!
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Kafka集群安装、配置和启动
Kafka需要依赖zookeeper,并且自身集成了zookeeper,zookeeper至少需要3个节点保证集群高可用,下面是在单机linux下创建kafka3个节点伪集群模式。
1、下载包
下载地址:http://kafka.apache.org/downloads
2、解压包
tar -zxvf kafka_2.11-1.0.0.tgz\
mv kafka_2.11-1.0.0 kafka1\
mv kafka_2.11-1.0.0 kafka2\
mv kafka_2.11-1.0.0 kafka3
3、创建ZK集群
修改ZK配置文件:kafka1-3/config/zookeeper.properties分别修改对应的参数。
dataDir=/usr/local/kafka/zookeeper1
dataLogDir=/usr/local/kafka/zookeeper/log
clientPort=2181
maxClientCnxns=0
tickTime=2000
initLimit=100
syncLimit=5
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:4888:5888
server.3=127.0.0.1:6888:7888
/usr/local/kafka/zookeeper1-3目录下分别创建myid文件,内容对应1~3
启动ZK,分别进行Kafka1-3目录:
bin/zookeeper-server-start.sh config/zookeeper.properties &
启动报文件失败,需要手动创建文件目录并赋予对应的权限。
4、创建Kafka集群
配置文件:kafka1-3/config/server.properties分别修改对应的参数。
broker.id=1
zookeeper.connect=localhost:2181,localhost:2182,localhost:2183
listeners=PLAINTEXT://192.168.12.11:9091
log.dirs=/tmp/kafka-logs-1
启动Kafka,分别进行Kafka1-3目录:
bin/kafka-server-start.sh config/server.properties &
启动报文件失败,需要手动创建文件目录并赋予对应的权限。
5、集群测试
在kafka1上面发送消息:
bin/kafka-console-producer.sh --broker-list localhost:9091 --topic test
在kafka2、kafka3消费消息:
bin/kafka-console-consumer.sh --zookeeper localhost:2181 --from-beginning --topic my-replicated-topic
Spring Boot 集成 Kafka 实战
1、添加spring-kafka依赖
<spring-kafka.version>2.1.0.RELEASE</spring-kafka.version>
<!-- spring-kafka-->
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>${spring-kafka.version}</version>
</dependency>
2、添加Spring Boot的自动配置
自动配置类:
org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration
配置属性类:
org.springframework.boot.autoconfigure.kafka.KafkaProperties
Spring:
kafka:
bootstrap-servers:
- 192.168.101.137:9091
- 192.168.101.137:9092
- 192.168.101.137:9093
producer:
retries: 0
batch-size: 16384
buffer-memory: 33554432
key-serializer: org.apache.kafka.common.serialization.StringSerializer
value-serializer: org.apache.kafka.common.serialization.StringSerializer
consumer:
group-id: foo
auto-offset-reset: earliest
enable-auto-commit: true
auto-commit-interval: 100
key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
3、发送消息
@Autowired
private KafkaTemplate kafkaTemplate;
@GetMapping("/send")
public Object send(String msg) {
kafkaTemplate.send("test", "name", msg);
return "send ok";
}
4、接收消息
在任何bean里面,添加@KafkaListener,支持消息接收。
@KafkaListener(topics = "test")
public void processMessage(String content) {
logger.info("收到消息, topic:test, msg:{}", content);
}
5、参考资料
Spring Boot & Kafka官方文档:
https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-kafka
Spring for Apache Kafka官方文档:
https://docs.spring.io/spring-kafka/reference/htmlsingle/