SpringBoot集成Kafka3

1. 环境说明

1. 在docker或windows中快速搭建zookeeper与kafka环境
2. zookeeper版本：apache-zookeeper-3.8.1-bin.tar.gz
3. kafak版本：kafka_2.13-3.4.0.tgz
4. SpringBoot版本：2.7.9

2. SpringBoot集成Kafka

1. 建立工程

在Idea的中通过Spring Initializr新建一个名为yuan-kafka-boot的工程

2. pom.xml

<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>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.7.9version>
        <relativePath/> 
    parent>
    <groupId>com.yuangroupId>
    <artifactId>yuan-kafka-bootartifactId>
    <version>1.0.0version>
    <name>yuan-kafka-bootname>
    <description>yuan-kafka-bootdescription>
    <properties>
        <java.version>1.8java.version>
    properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-thymeleafartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.kafkagroupId>
            <artifactId>spring-kafkaartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-configuration-processorartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>org.springframework.kafkagroupId>
            <artifactId>spring-kafka-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombokgroupId>
                            <artifactId>lombokartifactId>
                        exclude>
                    excludes>
                configuration>
            plugin>
        plugins>
    build>
project>

3. application.yml

server:
  servlet:
    context-path: /
  port: 2001

spring:
  application:
    name: yuan-kafka-boot
  # 连接kafka集群
  kafka:
    # 多个主机用逗号隔开
    bootstrap-servers: localhost:9092
    # 生产者
    producer:
      # key与value的序列化
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
    # 消费者
    consumer:
      # key与value的反序列化
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      group-id: boot-test-group

4. 编写生产者Controller

ProducerDemoController.java如下

package com.yuan.producer;

import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping("/producer")
public class ProducerDemoController {

    @Resource
    private KafkaTemplate<String, String> kafkaTemplate;

    /**
     * 发送消息
     *
     * @param msg
     * @return
     */
    @RequestMapping("/sendMsg")
    public String sendMsg(@RequestParam(name = "msg", defaultValue = "hello kafka") String msg) {
        kafkaTemplate.send("boot-test", msg);
        return "消息已发送";
    }
}

5. 消费着监听topic接收消息

1. 在类上面添加@Component或@Configuration注解
2. 通过@KafkaListener(topics = {"boot-test","test"})注解监听主题中的消息

package com.yuan.consumer;


import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;

@Component
@Configuration
@Slf4j
public class ConsumerDemo {
    /**
     * 监听topic-boot与test主题中的消息
     *
     * @param consumerRecord 消费着消息记录
     */
    @KafkaListener(topics = {"boot-test", "test"})
    public void consumerMsg(ConsumerRecord<?, ?> consumerRecord) {
        log.info("{}{}{}", "接收到来自主题[" + consumerRecord.topic(), "],key为:" + consumerRecord.key(), "的消息==>>" + consumerRecord.value());
    }
}