Kafka的安装及接入SpringBoot的详细过程

<!-- 继承Spring boot工程 -->
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.8.RELEASE</version>
</parent>
<properties>
    <fastjson.version>1.2.58</fastjson.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- kafkfa -->
    <dependency>
        <groupId>org.springframework.kafka</groupId>
        <artifactId>spring-kafka</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>${fastjson.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>
</dependencies>

spring:
  kafka:
    bootstrap-servers: xxx.xxx.xxx.xxx:9092
    producer:
      retries: 0
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer

spring:
  kafka:
    bootstrap-servers: xxx.xxx.xxx.xxx:9092
    consumer:
      group-id: kafka-demo-kafka-group
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class KafkaApp {
    public static void main(String[] args) {
        SpringApplication.run(KafkaApp.class, args);
    }
}

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.core.KafkaTemplate;
import org.springframework.test.context.junit4.SpringRunner;
​
​
@RunWith(SpringRunner.class)
@SpringBootTest
public class KafkaSendTest {
    @Autowired
    private KafkaTemplate<String,String> kafkaTemplate; //如果这里有红色波浪线，那是假错误
​
    @Test
    public void sendMsg(){
        String topic = "spring_test";
        kafkaTemplate.send(topic,"hello spring boot kafka!");
        System.out.println("发送成功.");
        while (true){ //保存加载ioc容器
​
        }
    }
}

​
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;
​
@Component
public class MyKafkaListener {
​
 //    以下两种方法都行
 // 指定监听的主题
//    @KafkaListener(topics = "spring_test")
//    public void receiveMsg(String message){
//        System.out.println("接收到的消息："+message);
//    }
​
    @KafkaListener(topics = "spring_test")
    public void handleMessage(ConsumerRecord<String, String> record) {
        System.out.println("接收到消息,偏移量为: " + record.offset() + " 消息为: " + record.value());
    }
}