安装jdk,zookeeper环境(zookeeper可以看这篇)
安装kafka,启动,先启动zookeeper,再启动kafka
1.点我下载
2.启动kafka环境
bin\windows\kafka-server-start.bat config\server.properties
准备所需依赖
<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>
<exclusions>
<exclusion>
<artifactId>spring-boot-test</artifactId>
<groupId>org.springframework.boot</groupId>
</exclusion>
<exclusion>
<artifactId>spring-test</artifactId>
<groupId>org.springframework</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-test</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.6.RELEASE</version>
<scope>compile</scope>
</dependency>
</dependencies>
Message.java
@Data
public class Message {
private Long id;
private String msg;
private LocalDateTime sendTime;
}
消费者
@Component
@Slf4j
public class KafkaReceiver {
@KafkaListener(topics = {"Y.S.K"})
public void listen(ConsumerRecord<?, ?> record) {
Optional<?> kafkaMessage = Optional.ofNullable(record.value());
if (kafkaMessage.isPresent()) {
Object message = kafkaMessage.get();
log.info("----------------- record =" + record);
log.info("------------------ message =" + message);
}
}
}
生产者
@Component
@Slf4j
public class KafkaSender {
@Autowired
private KafkaTemplate<String, String> kafkaTemplate;
private Gson gson = new GsonBuilder().create();
/**
* 发送消息的方法
*/
public void send() {
Message message = new Message();
message.setId(System.currentTimeMillis());
message.setMsg(UUID.randomUUID().toString());
message.setSendTime(LocalDateTime.now());
log.info("+++++++++++++++++++++ message = {}", gson.toJson(message));
kafkaTemplate.send("Y.S.K", gson.toJson(message));
}
}
测试类
@Component
@RunWith(SpringRunner.class)
@SpringBootTest(classes = KafkaDemoApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class TestKafka {
@Autowired
private KafkaSender sender;
@Test
public void aaa(){
for (int i = 0; i < 3; i++) {
//调用消息发送类中的消息发送方法
sender.send();
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
配置
server.port=9099
#kafka相关配置
spring.kafka.bootstrap-servers=127.0.0.1:9092
#设置一个默认组
spring.kafka.consumer.group-id=0
#key-value序列化反序列化
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
#每次批量发送消息的数量
spring.kafka.producer.batch-size=65536
spring.kafka.producer.buffer-memory=524288