kafka发送消息流程

配置props.put(ProducerConfig.PARTITIONER_CLASS_CONFIG, RoundRobinPartitioner.class);

public Map<String,Object> producerConfigs(){
    Map<String,Object> props = new HashMap<>();
    props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,bootstrapServers);
    props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,valueSerializer);
    props.put(ProducerConfig.PARTITIONER_CLASS_CONFIG, RoundRobinPartitioner.class);
    return props;
}

public ProducerFactory producerFactory(){
    return new DefaultKafkaProducerFactory<>(producerConfigs());
}

// 覆盖spring-kafka中的配置
@Bean
public KafkaTemplate<String,Object> kafkaTemplate(){
    return new KafkaTemplate<String,Object>(producerFactory());
}

自定义消息拦截器

public class CustomerProducerInterceptor implements ProducerInterceptor<String,Object> {

    // 发送消息时，对消息拦截。
    @Override
    public ProducerRecord<String,Object> onSend(ProducerRecord producerRecord) {
        System.out.println("拦截消息" + producerRecord.toString());
        return null;
    }

    // 服务器是否收到了当前这条消息
    @Override
    public void onAcknowledgement(RecordMetadata recordMetadata, Exception e) {
        if(recordMetadata != null){
            System.out.println("服务器收到消息" + recordMetadata.offset());
        }else{
            // 没有收到消息发送失败
            System.out.println("消息发送失败!!!");
        }
    }

    @Override
    public void close() {

    }

    @Override
    public void configure(Map<String, ?> map) {

    }
}