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需求

我们需要通过Spring Kafka库，将消息推送给Kafka的topic中。这里假设Kafka的集群和用户我们都有了。这里Kafka认证采取SASL_PLAINTEXT方式接入，SASL 采用 SCRAM-SHA-256 方式加解密。

pom.xml

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

我这里不需要写版本号，应为我使用的Spring Boot。Spring Boot会自动帮我挑选spring-kafka应该使用哪个版本合适。

application.yml

spring:kafka:producer:# kafka集群地址bootstrap-servers: xx.xx.xx.xxx:9092,xx.xx.xx.xxx:9092,xx.xx.xx.xxx:9092client-id: producer-dev# SASL_PLAINTEXT 接入方式security:protocol: SASL_PLAINTEXT# 反序列化方式key-serializer: org.apache.kafka.common.serialization.StringSerializervalue-serializer: org.apache.kafka.common.serialization.StringSerializerproperties:# SASL 采用 SCRAM-SHA-256 方式sasl:mechanism: SCRAM-SHA-256# jaas配置jaas:options:username: kafkauserpassword: kafkapwdenabled: truelogin-module: org.apache.kafka.common.security.scram.ScramLoginModulecontrol-flag: required

以上，是关于Spring Kafka的全部配置。下面摘要出来的配置，是可以单独配置在配置中心的：

topic:# 接收消息的主题配置save: hello_kafka_topic
spring:kafka:producer:client-id: producer-dev# kafka集群地址bootstrap-servers: xx.xx.xx.xxx:9092,xx.xx.xx.xxx:9092,xx.xx.xx.xxx:9092# jaas配置jaas:options:username: kafkauserpassword: kafkapwd

Java

KafkaProducerService.java

public interface KafkaProducerService {/*** 转发消息到kafka*/void sendToKafka(String msg);}

KafkaProducerServiceImpl.java

import cn.com.xxx.service.KafkaProducerService;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.kafka.core.KafkaProducerException;
import org.springframework.kafka.core.KafkaSendCallback;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.SendResult;
import org.springframework.stereotype.Service;
import org.springframework.util.concurrent.ListenableFuture;import javax.annotation.Resource;/*** 转发消息到kafka*/
@RefreshScope
@Slf4j
@Service
public class KafkaProducerServiceImpl implements KafkaProducerService {@Resourceprivate KafkaTemplate<String, String> kafkaTemplate;/*** kafka接收消息的主题*/@Value("${topic.save}")private String topic;@Overridepublic void sendToKafka(String msg) {log.info(String.format("$$$$ => Producing message: %s", msg));ProducerRecord<String, String> recordKafka = new ProducerRecord<>(topic, msg);ListenableFuture<SendResult<String, String>> future = kafkaTemplate.send(recordKafka);future.addCallback(new KafkaSendCallback<String, String>() {@Overridepublic void onSuccess(SendResult<String, String> result) {log.info("成功发消息:{}给Kafka:{}", msg, result);}@Overridepublic void onFailure(KafkaProducerException ex) {log.error("发消息:{}给Kafka:{}", msg, recordKafka, ex);}});}
}

到这里为止Spring Kafka生产者所有配置就都可以了。这里使用的异步监听kafka回调的方式发送消息。

总结

这里使用Spring Kafka库异回调步给Kafka消息。这里使用的Spring Kafka库是老版本，所以，这里的使用的回调类是ListenableFuture类。

参考：

• Spring for Apache Kafka2.8.3
• Spring for Apache Kafka