条件:搭建好kafka环境

搭建zookeeper+kafka地址:https://www.cnblogs.com/weibanggang/p/12377055.html

 

1、java无注解方式

加入kafka包:

 <dependency> 
            <groupId>org.apache.kafka</groupId> 
            <artifactId>kafka-clients</artifactId> 
            <version>2.0.0</version> 
 </dependency>

 

 

 消费者代码

package com.wbg.springboot_kafka; 
 
import org.apache.kafka.clients.consumer.ConsumerConfig; 
import org.apache.kafka.clients.consumer.ConsumerRecords; 
import org.apache.kafka.clients.consumer.KafkaConsumer; 
import org.apache.kafka.common.serialization.IntegerDeserializer; 
import org.apache.kafka.common.serialization.StringDeserializer; 
 
import java.time.Duration; 
import java.util.Collections; 
import java.util.Properties; 
 
public class Consumer extends Thread { 
 
    KafkaConsumer<Integer,String> consumer; 
    String topic; 
 
    public Consumer(String topic){ 
        Properties properties=new Properties(); 
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.198.129:9092,192.168.198.130:9092,192.168.198.131:9092"); 
        properties.put(ConsumerConfig.CLIENT_ID_CONFIG,"consumer"); 
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"consumer"); 
        properties.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG,"30000"); 
        properties.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG,"1000"); //自动提交(批量确认) 
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class.getName()); 
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName()); 
        //一个新的group的消费者去消费一个topic 
        properties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,"earliest"); //这个属性. 它能够消费昨天发布的数据 consumer=new KafkaConsumer<Integer, String>(properties); this.topic = topic; } @Override public void run() { consumer.subscribe(Collections.singleton(this.topic)); while (true){ ConsumerRecords<Integer,String> consumerRecords = consumer.poll(Duration.ofSeconds(1)); consumerRecords.forEach(record ->{ System.out.println(record.key()+"->"+record.value()+"->"+record.offset()); }); } } public static void main(String[] args) { new Consumer("test_partition").start(); } }

生产者代码

package com.wbg.springboot_kafka; 
 
import org.apache.kafka.clients.producer.KafkaProducer; 
import org.apache.kafka.clients.producer.ProducerConfig; 
import org.apache.kafka.clients.producer.ProducerRecord; 
import org.apache.kafka.common.serialization.IntegerSerializer; 
import org.apache.kafka.common.serialization.StringSerializer; 
 
import java.util.Properties; 
import java.util.concurrent.TimeUnit; 
 
public class Producer extends Thread { 
    KafkaProducer<Integer, String> producer; 
    String topic; 
 
    public Producer(String topic) { 
        Properties properties = new Properties(); 
        properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.198.129:9092,192.168.198.130:9092,192.168.198.131:9092"); 
        properties.put(ProducerConfig.CLIENT_ID_CONFIG, "producer"); 
        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, IntegerSerializer.class.getName()); 
        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName()); 
 
        producer = new KafkaProducer<Integer, String>(properties); 
        this.topic = topic; 
    } 
 
    @Override 
    public void run() { 
        int num = 0; 
        while (num < 20) { 
 
            try { 
                String msg = "kafka msg " + num; 
 
                producer.send(new ProducerRecord<>(topic, 3, msg), ((recordMetadata, e) -> { 
                    System.out.println(recordMetadata.offset() + "->" + recordMetadata.partition()); 
                })); 
                TimeUnit.SECONDS.sleep(2); 
            } catch (InterruptedException e) { 
                e.printStackTrace(); 
            } 
        } 
 
    } 
 
    public static void main(String[] args) { 
        new Producer("test_partition").start(); 
    } 
}

启动生产者

 

 

 启动消费者

 

 

 

2、SpringBoot注解方式

pom依赖:

        <dependency> 
            <groupId>org.springframework.kafka</groupId> 
            <artifactId>spring-kafka</artifactId> 
            <version>2.2.0.RELEASE</version> 
        </dependency>

 application.properties文件

spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer 
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.IntegerSerializer 
 
 
spring.kafka.bootstrap-servers=192.168.198.129:9092,192.168.198.130:9092,192.168.198.131:9092 
 
spring.kafka.consumer.group-id=springboot-groupid 
spring.kafka.consumer.auto-offset-reset=earliest 
spring.kafka.consumer.enable-auto-commit=true 
 
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.IntegerDeserializer 
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

 

 

 消费者代码

@Component 
public class KafkaMyConsumer { 
 
    @KafkaListener(topics = {"test"}) 
    public void listener(ConsumerRecord record){ 
        Optional msg = Optional.ofNullable(record.value()); 
        if(msg.isPresent()){ 
            System.out.println(msg.get());; 
        } 
    } 
}
View Code

 

 

 生产者代码

@Component 
public class KafkaMyProducer { 
    @Autowired 
    private KafkaTemplate<Integer,String> kafkaTemplate; 
 
    public void send(){ 
        kafkaTemplate.send("test",1,"msgData"); 
    } 
}
View Code

 

 启动

 

 

@SpringBootApplication 
public class SpringbootKafkaApplication { 
 
    public static void main(String[] args) throws InterruptedException { 
        ConfigurableApplicationContext context = SpringApplication.run(SpringbootKafkaApplication.class,args); 
        KafkaMyProducer kafkaMyProducer = context.getBean(KafkaMyProducer.class); 
        for (int i = 0; i < 10; i++) { 
            kafkaMyProducer.send(); 
            TimeUnit.SECONDS.sleep(3); 
        } 
    } 
 
}

 

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