SpringBoot集成Kafka

        
            org.springframework.kafka
            spring-kafka
        

如果不知道怎么安装，启动请查看博主的文章
https://blog.csdn.net/csdnerM/article/details/121851493
配置文件连接kafka

spring.kafka.bootstrap-servers=ip:端口
spring.kafka.consumer.group-id=consumer-group

编写生产类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class KafkaProducer {

    @Autowired
    private KafkaTemplate kafkaTemplate;

    
    @GetMapping("/kafka/normal/{topic}/{message}")
    public void sendMessage1(@PathVariable("topic") String topic, @PathVariable("message") String normalMessage) {
        kafkaTemplate.send(topic, normalMessage);
    }

}

编写消费者

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Service;


@Service
public class KafkaConsumer {

    
    @KafkaListener(topics = {"topictest1"})
    public void message1(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("点对点消费1："+record.topic()+"-"+record.partition()+"-"+record.value());
    }

}

测试

如果有两个方法

   
    @KafkaListener(topics = {"topictest1"})
    public void message1(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("点对点消费1："+record.topic()+"-"+record.partition()+"-"+record.value());
    }
    
    @KafkaListener(topics = {"topictest1"})
    public void message(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("点对点消费2："+record.topic()+"-"+record.partition()+"-"+record.value());
    }

则只会消费一个

生产者是同一个，消费者如下

 
    @KafkaListener(topics = {"topictest2"},groupId = "1")
    public void message2(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("发布订阅模式1："+record.topic()+"-"+record.partition()+"-"+record.value());
    }
    
    @KafkaListener(topics = {"topictest2"},groupId = "2")
    public void message3(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("发布订阅模式2："+record.topic()+"-"+record.partition()+"-"+record.value());
    }

测试

生产者

	@GetMapping("/kafka/callbackOne/{message}")
    public void sendMessage2(@PathVariable("message") String callbackMessage) {
        kafkaTemplate.send("topictest3", callbackMessage).addCallback(success -> {
            // 消息发送到的topic
            String topic = success.getRecordmetadata().topic();
            // 消息发送到的分区
            int partition = success.getRecordmetadata().partition();
            // 消息在分区内的offset
            long offset = success.getRecordmetadata().offset();
            System.out.println("发送消息成功:" + topic + "-" + partition + "-" + offset);
        }, failure -> {
            System.out.println("发送消息失败:" + failure.getMessage());
        });
    }
    @GetMapping("/kafka/callbackTwo/{message}")
    public void sendMessage3(@PathVariable("message") String callbackMessage) {
        kafkaTemplate.send("topictest3", callbackMessage).addCallback(new ListenableFutureCallback>() {
            @Override
            public void onFailure(Throwable ex) {
                System.out.println("发送消息失败："+ex.getMessage());
            }

            @Override
            public void onSuccess(SendResult result) {
                System.out.println("发送消息成功：" + result.getRecordmetadata().topic() + "-"
                        + result.getRecordmetadata().partition() + "-" + result.getRecordmetadata().offset());
            }
        });
    }

消费者

    @KafkaListener(topics = {"topictest3"})
    public void message4(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("回调方法："+record.topic()+"-"+record.partition()+"-"+record.value());
    }

测试

    @GetMapping("/kafka/transaction1")
    public void sendMessage4(){
        // 声明事务：后面报错消息不会发出去
        kafkaTemplate.executeInTransaction(operations -> {
            operations.send("topictest4","test executeInTransaction");
            throw new RuntimeException("fail");
        });
    }

接收者

    
    @KafkaListener(topics = {"topictest4"})
    public void message5(ConsumerRecord record){
        // 消费的哪个topic、partition的消息,打印出消息内容
        System.out.println("回调方法："+record.topic()+"-"+record.partition()+"-"+record.value());
    }

测试

没有发送

    @GetMapping("/kafka/transaction2")
    public void sendMessage5(){
        // 不声明事务：后面报错但前面消息已经发送成功了
        kafkaTemplate.send("topictest4","test executeInTransaction");
        System.out.println("发送消息");
        throw new RuntimeException("fail");
    }

测试

已发送

好了，就是这么的简单，完整代码请移至SpringBoot+Kafka 查看