pom依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <artifactId>SpringBoot</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>

<!--        <dependency>-->
<!--            <groupId>org.projectlombok</groupId>-->
<!--            <artifactId>lombok</artifactId>-->
<!--            <optional>true</optional>-->
<!--        </dependency>-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>3.0.3</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

SpringBoot 生产者

package ltd.cmjava.springboot.springbootkafka.controller;

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

@RestController
public class ProducerController {

    @Autowired
    KafkaTemplate<String, String> kafka;

    @RequestMapping("/cm")
    public String data(){
        // 通过kafka发送出去
        kafka.send("first", "springboot");

        return "ok";
    }
}

SpringBoot 消费者

package ltd.cmjava.springboot.springbootkafka.controller;

import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.KafkaListener;

@Configuration
public class KafkaConsumer {

    @KafkaListener(topics = "first")
    public void consumerTopic(String msg){
        System.out.println("收到消息：" + msg);
    }
}

主程序入口

package ltd.cmjava.springboot.springbootkafka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootKafkaApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootKafkaApplication.class, args);
    }

}

测试

测试生产者

# 访问http://127.0.0.1:8080/cm，看看shell控制台输出
kafka-console-consumer.sh -bootstrap-server hadoop100:9092 --topic first 

测试消费者

# 从shell控制台发生消息，看看IDEA控制台输出
kafka-console-producer.sh --bootstrap-server hadoop100:9092 --topic first