springboot2集成kafak

最新推荐文章于 2025-04-20 14:00:00 发布

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最新推荐文章于 2025-04-20 14:00:00 发布

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分类专栏： springboot 文章标签： kafka

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本文介绍如何在Windows和Ubuntu上安装配置Kafka，并通过Spring Boot项目整合Kafka，实现消息的发送与接收。文中提供了详细的步骤及代码示例。

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一、下载和启动kafka

启动kafka服务之前要先启动zookeeper，目前kafka的压缩包中是包含zookeeper的

1、从官网下载kafka的Binary压缩包：http://kafka.apache.org/downloads
2、解压下载的压缩包，windows上解压后的kafka文件夹放在了D:\java\kafka_2.12-2.1.1\bin\windows目录下
3、windows启动zookeeper

D:\java\kafka_2.12-2.1.1\bin\windows>zookeeper-server-start.bat ..\..\config\zookeeper.properties

4、windows启动kafka

D:\java\kafka_2.12-2.1.1\bin\windows>kafka-server-start.bat ..\..\config\server.properties

5、Ubuntu解压运行

解压

tar zxvf kafka_2.12-2.1.1.tgz

运行Zookeeper

kafka_2.12-2.1.1/bin/zookeeper-server-start.sh kafka_2.12-2.1.1/config/zookeeper.properties

运行kafka

kafka_2.12-2.1.1/bin/kafka-server-start.sh kafka_2.12-2.1.1/config/server.properties

运行时注意相对路径和在不同的命令行窗口执行命令

二、创建springboot项目进行整合

1、导入kafka的jar包

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
</dependency>

2、配置application.properties

spring.kafka.bootstrap-servers=127.0.0.1:9092
spring.kafka.consumer.group-id=chat_group

3、编写收发消息的代码

package com.jf.netty.nettytest.chat;

import org.apache.kafka.clients.admin.AdminClient;
import org.apache.kafka.clients.admin.NewTopic;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.core.KafkaAdmin;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.SendResult;
import org.springframework.stereotype.Service;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;

import javax.annotation.PostConstruct;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

@Service
public class KafkaServiceImpl extends AbsQueueService {
    private static Logger logger = LoggerFactory.getLogger(KafkaServiceImpl.class);

    private static final String CHAT_MESSAGE_TOPIC = "chat_message";

    @Autowired
    RoomService roomService;
    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;
    @Autowired
    private KafkaAdmin kafkaAdmin;

    /**
     * 初始化Kafka Topic
     */
    @PostConstruct
    public void init() {
        //第一个是参数是topic名字，第二个参数是分区个数，第三个是topic的复制因子个数
        NewTopic newTopic = new NewTopic(CHAT_MESSAGE_TOPIC, 1, (short) 1);
        List<NewTopic> topics = Arrays.asList(newTopic);

        AdminClient adminClient = AdminClient.create(kafkaAdmin.getConfig());
        adminClient.createTopics(topics);
        adminClient.close(5, TimeUnit.SECONDS);
    }

    /**
     * 发送kafka消息
     * @param value
     */
    public void send(String value) {
        ListenableFuture<SendResult<String, String>> future = kafkaTemplate.send(CHAT_MESSAGE_TOPIC, value);
        future.addCallback(new ListenableFutureCallback<SendResult<String, String>>() {
            @Override
            public void onFailure(Throwable throwable) {
                logger.info("发送kafka消息失败");
                //发送失败相关处理
            }
            @Override
            public void onSuccess(SendResult<String, String> stringStringSendResult) {
//                logger.info("发送kafka消息成功");
            }
        });
    }

    /**
     * 消费kafka消息
     * @param record
     */
    @KafkaListener(topics = CHAT_MESSAGE_TOPIC)
    public void listen(ConsumerRecord<?, String> record) {
        String[] value = splitMessage(record.value());
        ChatEvent chatEvent = ChatEventPool.get();
        chatEvent.setEvent(2);
        chatEvent.setChannelId(value[0]);
        chatEvent.setMessage(value[1]);
        roomService.addEvent(chatEvent);
    }

}

说明：