Kafka-入门及简单示例

启动与简单示例

# 命令行1
#开启Zookeeper
E:\>cd E:\kafka_2.13-3.6.0

E:\kafka_2.13-3.6.0>bin\windows\zookeeper-server-start.bat config\zookeeper.properties
# 命令行2
#开启Kafka
E:\>cd E:\kafka_2.13-3.6.0
E:\kafka_2.13-3.6.0>bin\windows\kafka-server-start.bat config\server.properties
# 命令行3
#创建主题
E:\kafka_2.13-3.6.0\bin\windows>kafka-topics.bat --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test
#往主题发送消息 生产者命令
E:\kafka_2.13-3.6.0\bin\windows>kafka-console-producer.bat --broker-list localhost:9092 --topic test
>hello
>woe
#查看发送的消息 消费者命令
#命令行4
E:\kafka_2.13-3.6.0\bin\windows>kafka-console-consumer.bat --bootstrap-server localhost:9092 --topic test --from-beginning

结果

Spring整合Kafka–简单示例

pom.xml

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

application.properties

#Kafka
spring.kafka.bootstrap-servers=localhost:9092
spring.kafka.consumer.group-id=community-consumer-group
spring.kafka.consumer.enable-auto-commit=true
spring.kafka.consumer.auto-commit-interval=3000

一个生产者 一个消费者
生产者在某些事件时触发消息产生
消费者根据topic监听事件 如果有生产者产生消息 自动进行消费

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class KafkaTest {
    @Autowired
    private KafkaProducer kafkaProducer;
    @Test
    public void testKafka(){
        kafkaProducer.sendMessage("test","你好啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊");
        kafkaProducer.sendMessage("test","在吗啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊");
        try {
            Thread.sleep(1000*10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}
//生产者
@Component
class KafkaProducer{
    @Autowired
    private KafkaTemplate kafkaTemplate;
    public void sendMessage(String topic,String content){
        kafkaTemplate.send(topic,content);
    }
}
//消费者
@Component
class KafkaConsumer{
    @KafkaListener(topics = {"test"})
    public void handleMessage(ConsumerRecord record){
        System.out.println(record.value());
    }
}