Spring boot集成Kafka消息中间件代码实例

一．创建Spring boot项目，添加如下依赖

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.kafka/spring-kafka --> <dependency> <groupId>org.springframework.kafka</groupId> <artifactId>spring-kafka</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients --> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.41</version> </dependency>

二．配置文件

server.port=4400

#kafka配置#============== kafka ===================# 指定kafka 代理地址，可以多个spring.kafka.bootstrap-servers=192.168.102.88:9092# 指定默认消费者group idspring.kafka.consumer.group-id=jkafka.demo#earliest 当各分区下有已提交的offset时，从提交的offset开始消费；无提交的offset时，从头开始消费#latest 当各分区下有已提交的offset时，从提交的offset开始消费；无提交的offset时，消费新产生的该分区下的数据#none topic各分区都存在已提交的offset时，从offset后开始消费；只要有一个分区不存在已提交的offset，则抛出异常spring.kafka.consumer.auto-offset-reset=latestspring.kafka.consumer.enable-auto-commit=falsespring.kafka.consumer.auto-commit-interval=100# 指定消费者消息key和消息体的编解码方式spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

三．编辑消息实体

@Datapublic class Message implements Serializable{ /** * */ private static final long serialVersionUID = 2522280475099635810L; //消息ID private String id; //消息内容 private String msg; // 消息发送时间 private Date sendTime;}

四．消息发送类

@Componentpublic class KfkaProducer { private static Logger logger = LoggerFactory.getLogger(KfkaProducer.class); @Autowired private KafkaTemplate<String, String> kafkaTemplate; public void send(String topic,Message message) { try { logger.info('正在发送消息...'); kafkaTemplate.send(topic,JSON.toJSONString(message)); logger.info('发送消息成功 ----->>>>> message = {}', JSON.toJSONString(message)); } catch (Exception e) { e.getMessage(); } }}

五．发现监听接收类

@Componentpublic class KfkaListener { private static Logger logger = LoggerFactory.getLogger(KfkaListener.class); @KafkaListener(topics = {'hello'}) public void listen(ConsumerRecord<?, ?> record) { Optional<?> kafkaMessage = Optional.ofNullable(record.value()); if (kafkaMessage.isPresent()) { Object message = kafkaMessage.get(); logger.info('接收消息------------ record =' + record); logger.info('接收消息----------- message =' + message); } }}

六．定时发送信息测试类

@EnableScheduling@Componentpublic class PublisherController { private static final Logger log = LoggerFactory.getLogger(PublisherController.class); @Autowired private KfkaProducer kfkaProducer; @Scheduled(fixedRate = 5000) public void pubMsg() { Message msg=new Message(); msg.setId(UUID.randomUUID().toString()); msg.setMsg('发送这条消息给你，你好啊！！！！！！'); msg.setSendTime(new Date()); kfkaProducer.send('hello', msg);; log.info('Publisher sendes Topic... '); }}

七．测试结果

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