- 导入spring-kafka依赖信息
点击查看代码
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- kafkfa -->
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<exclusions>
<exclusion>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
</dependency>
</dependencies>
点击查看代码
server:
port: 9991
spring:
application:
name: kafka-demo
kafka:
bootstrap-servers: 192.168.200.130:9092
producer:
retries: 10
key-serializer: org.apache.kafka.common.serialization.StringSerializer
value-serializer: org.apache.kafka.common.serialization.StringSerializer
consumer:
group-id: ${spring.application.name}-test
key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
点击查看代码
@RestController
public class HelloController {
@Autowired
private KafkaTemplate<String,String> kafkaTemplate;
@GetMapping("/hello")
public String hello(){
kafkaTemplate.send("wzh-topic","hello-kafka");
return "ok";
}
}
点击查看代码
@Component
public class HelloListener {
@KafkaListener(topics = "wzh-topic")
public void onMessage(String message){
if(!StringUtils.isEmpty(message)){
System.out.println(message);
}
}
}
传递消息为对象
目前springboot整合后的kafka，因为序列化器是StringSerializer，这个时候如果需要传递对象可以有两种方式
方式一：可以自定义序列化器，对象类型众多，这种方式通用性不强。
方式二：可以把要传递的对象进行转json字符串，接收消息后再转为对象即可。
步骤
- 发送消息
点击查看代码
@GetMapping("/hello")
public String hello(){
User user = new User();
user.setUsername("xiaowang");
user.setAge(18);
kafkaTemplate.send("user-topic", JSON.toJSONString(user));
return "ok";
}
点击查看代码
@Component
public class HelloListener {
@KafkaListener(topics = "user-topic")
public void onMessage(String message){
if(!StringUtils.isEmpty(message)){
User user = JSON.parseObject(message, User.class);
System.out.println(user);
}
}
}