java|Springboot + Kafka 入门实例入门dem 列表|kafka|vue|activemq|java|kafka

版本说明

springboot版本：2.3.3.RELEASE
kakfa服务端版本：kafka_2.12-2.6.0.tgz
zookeeper服务端版本：apache-zookeeper-3.6.1-bin.tar.gz

实例搭建前提条件
1，搭建好zookeeper服务，本实例zookeeper使用单机伪集群模式，

192.168.1.126:2181, 192.168.1.126:2182, 192.168.1.126:2183

【java|Springboot + Kafka 入门实例入门dem】2，搭建好kafka服务，本实例kafka使用单机伪集群模式，

192.168.1.126:9092, 192.168.1.126:9093, 192.168.1.126:9094

1. 导入相关依赖

4.0.0org.springframework.boot spring-boot-starter-parent 2.3.3.RELEASE com.example springboot-kafka-demo 1.0-SNAPSHOT springboot-kafka-demo springboot-kafka-demo1.8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test org.springframework.kafka spring-kafka org.projectlombok lombok true com.alibaba fastjson 1.2.54 org.springframework.boot spring-boot-maven-plugin

2. yml配置

server: port: 8080 servlet: context-path: / tomcat: uri-encoding: UTF-8spring: kafka: #本地虚拟机kafka伪集群 bootstrap-servers: 192.168.1.126:9092,192.168.1.126:9093,192.168.1.126:9094 producer: key-serializer: org.apache.kafka.common.serialization.StringSerializer value-serializer: org.apache.kafka.common.serialization.StringSerializer batch-size: 65536 buffer-memory: 524288 #自定义的topic myTopic1: testTopic1 myTopic2: testTopic2 consumer: group-id: default-group#默认组id后面会配置多个消费者组 key-deserializer: org.apache.kafka.common.serialization.StringDeserializer value-deserializer: org.apache.kafka.common.serialization.StringDeserializer auto-offset-reset: latest enable-auto-commit: false#关闭自动提交改由spring-kafka提交 auto-commit-interval: 100 max-poll-records: 20#批量消费一次接收的最大数量

3. 部分代码消息实体类

package com.example.demo.entity; import java.util.Date; import lombok.Data; import lombok.ToString; @Data @ToString public class Message { private Long id; private String msg; private Date sendTime; }

kafka配置类

package com.example.demo.config; import lombok.Data; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; /** * kafka配置类 */ @Data @Configuration public class KafkaConfiguration { /** * kafaka集群列表 */ @Value("${spring.kafka.bootstrap-servers}") private String bootstrapServers; /** * kafaka消费group列表 */ @Value("${spring.kafka.consumer.group-id}") private String defaultGroupId; /** * 消费开始位置 */ @Value("${spring.kafka.consumer.auto-offset-reset}") private String autoOffsetReset; /** * 是否自动提交 */ @Value("${spring.kafka.consumer.enable-auto-commit}") private String enableAutoCommit; /** * #如果'enable.auto.commit'为true，则消费者偏移自动提交给Kafka的频率（以毫秒为单位），默认值为5000。 */ @Value("${spring.kafka.consumer.auto-commit-interval}") private String autoCommitInterval; /** * 一次调用poll()操作时返回的最大记录数，默认值为500 */ @Value("${spring.kafka.consumer.max-poll-records}") private String maxPollRecords; /** * 自定义的topic1 */ @Value("${spring.kafka.producer.myTopic1}") private String myTopic1; /** * 自定义的topic2 */ @Value("${spring.kafka.producer.myTopic2}") private String myTopic2; }

消费者监听类

package com.example.demo.consumer; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.springframework.kafka.annotation.KafkaListener; import org.springframework.stereotype.Component; /** * 消费者1（监听topic1队列） */ @Component public class ConsumerListener1 {@KafkaListener(topics = "${spring.kafka.producer.myTopic1}") public void listen(ConsumerRecord record) { System.out.println(record); String value = https://www.it610.com/article/record.value(); System.out.println("消费者1接收到消息：" + value); } }

测试类

package com.example.demo.controller; import com.alibaba.fastjson.JSON; import com.example.demo.config.KafkaConfiguration; import com.example.demo.entity.Message; import com.example.demo.service.KafkaService; import com.example.demo.util.UUID; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.Date; @Slf4j @RestController @RequestMapping("/kafka") public class KafkaController { @Autowired private KafkaService kafkaService; @Autowired private KafkaConfiguration kafkaConfiguration; /** * 发送文本消息 * @param msg * @return */ @GetMapping("/send/{msg}") public String send(@PathVariable String msg) { kafkaService.send(kafkaConfiguration.getMyTopic1(), msg); return "生产者发送消息给topic1："+msg; }/** * 发送JSON数据 * @return */ @GetMapping("/send2") public String send2() { Message message = new Message(); message.setId(System.currentTimeMillis()); message.setMsg("生产者发送消息到topic1: " + UUID.getUUID32()); message.setSendTime(new Date()); String value = https://www.it610.com/article/JSON.toJSONString(message); log.info("生产者发送消息到topic1 message = {}", value); kafkaService.send(kafkaConfiguration.getMyTopic1(),value); return value; }/** * 发送JSON数据 * @return */ @GetMapping("/send3") public String send3() { Message message = new Message(); message.setId(System.currentTimeMillis()); message.setMsg("生产者发送消息到topic2: " + UUID.getUUID32()); message.setSendTime(new Date()); String value = https://www.it610.com/article/JSON.toJSONString(message); log.info("生产者发送消息到topic2 message = {}", value); kafkaService.send(kafkaConfiguration.getMyTopic2(),value); return value; }}

4. 实例运行结果