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Kafka笔记大纲

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SpringBoot 是一个在 JavaEE 开发中非常常用的组件。可以用于 Kafka 的生产者，也可以用于 SpringBoot 的消费者

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一、SpringBoot 环境准备

1.1.创建一个 Spring Initializr

1.2.引入场景启动器：

<?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 https://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>2.6.1</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.jianqun</groupId><artifactId>springboot-kafka</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot-kafka</name><description>springboot-kafka</description><properties><java.version>1.8</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><spring-boot.version>2.6.13</spring-boot.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></dependencies><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>1.8</source><target>1.8</target><encoding>UTF-8</encoding></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring-boot.version}</version><configuration><mainClass>com.jianqun.springbootkafka.SpringbootKafkaApplication</mainClass><skip>true</skip></configuration><executions><execution><id>repackage</id><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></build></project>

1.3.编写配置文件：

# 应用服务 WEB 访问端口
server.port=8080# 应用名称
spring.application.name=jianqun_springboot_kafka# 指定 kafka 的地址
spring.kafka.bootstrapservers=hadoop102:9092,hadoop103:9092,hadoop104:9092# 生产者配置
# 指定 key 和 value 的序列化器
spring.kafka.producer.keyserializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.valueserializer=org.apache.kafka.common.serialization.StringSerializer# 消费者配置
# 指定 key 和 value 的反序列化器
spring.kafka.consumer.keydeserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.valuedeserializer=org.apache.kafka.common.serialization.StringDeserializer
# 指定消费者组的 group_id
spring.kafka.consumer.group-id=jianqun
# =========消费者配置结束=========

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二、编写生产端消息：

• 1.编写controller接口，当收到请求的时候，模式发送一条数据到kafka中

package com.jianqun.springbootkafka.kafka;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.web.bind.annotation.RequestMapping;public class ProducerController {// Kafka 模板用来向 kafka 发送数据@AutowiredKafkaTemplate<String, String> kafka;@RequestMapping("/a")public String data() {String msg = "生产端消息";kafka.send("firstopic", msg);return "ok";}
}

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三、编写消费者端消息：

• 1.消费者代码：

package com.jianqun.springbootkafka.kafka;import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.KafkaListener;@Configuration
public class KafkaConsumer {// 指定要监听的 topic@KafkaListener(topics = "firstopic")public void consumeTopic(String msg) {// 参数: 收到的 valueSystem.out.println("收到的信息: " + msg);}
}

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四、测试：