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深入浅出 Kafka（六）Spring Kafka API

　　在上一节中学习了如何通过 Kafka API 的方式进行生产者和消费者及其配置，但是主要是通过手动编写 Java 代码的方式实现。在项目开发中，我们主要会使用到 SpringBoot 框架，这里就将带你 SpringBoot 与 Kafka 整合，通过注解和配置的方式轻松集成。

　　这里将列举，最常见的生产者和消费者使用方式，更完整的 API 文档，请转向 Overview (Spring Kafka 2.2.8.RELEASE API) 学习。

　　送上本节 DEMO 项目代码，点击预览。

一、Producer

1. KafkaProducer

package cn.frankfeekr.springbootkafkasample.client;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class KafkaProducer {

    private static final Logger LOG = LoggerFactory.getLogger(KafkaProducer.class);

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    @Value("${app.topic.foo}")
    private String topic;


    @GetMapping("demo")
    public String send(@RequestParam String msg){
//        LOG.info("sending message='{}' to topic='{}'", message, topic);
        kafkaTemplate.send(topic,"key", msg);
        return "send success";
    }
}

2. KafkaProducerConfig

package cn.frankfeekr.springbootkafkasample.client;

import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;

import java.util.HashMap;
import java.util.Map;

@Configuration
public class KafkaSenderConfig {

    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Bean
    public Map<String, Object> producerConfigs() {
        Map<String, Object> props = new HashMap<>();
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        return props;
    }

    @Bean
    public ProducerFactory<String, String> producerFactory() {
        return new DefaultKafkaProducerFactory<>(producerConfigs());
    }

    @Bean
    public KafkaTemplate<String, String> kafkaTemplate() {
        return new KafkaTemplate<>(producerFactory());
    }

}

二、Consumer

3. KafkaConsumer

package cn.frankfeekr.springbootkafkasample.client;

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.stereotype.Service;

@Service
public class KafkaConsumer {

    private static final Logger LOG = LoggerFactory.getLogger(KafkaConsumer.class);

    @KafkaListener(topics = "${app.topic.foo}")
    public void listen(ConsumerRecord<String, String> record, Acknowledgment ack, Consumer<?, ?> consumer) {
        LOG.warn("topic:{},key: {},partition:{}, value: {}, record: {}",record.topic(), record.key(),record.partition(), record.value(), record);
        if (record.topic().equalsIgnoreCase("test")){
            throw new RuntimeException();
        }
        System.out.println("提交 offset ");
        consumer.commitAsync();
    }
}

4. KafkaConsumerConfig

package cn.frankfeekr.springbootkafkasample.client;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.config.KafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.listener.ConcurrentMessageListenerContainer;
import org.springframework.kafka.listener.ContainerProperties;

import java.util.HashMap;
import java.util.Map;

@EnableKafka
@Configuration
public class KafkaConsumerConfig {

    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Bean
    public Map<String, Object> consumerConfigs() {
        Map<String, Object> props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, "foo");
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");

        return props;
    }


    @Bean
    public ConsumerFactory<String, String> consumerFactory() {
        return new DefaultKafkaConsumerFactory<>(consumerConfigs());
    }

    @Bean
    public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>> kafkaListenerContainerFactory() {
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConcurrency(3);
        factory.getContainerProperties().setAckMode(ContainerProperties.AckMode.MANUAL);
        factory.setConsumerFactory(consumerFactory());
        return factory;
    }

}

三、配置文件

server:
  port: 9090
spring:
  kafka:
    bootstrap-servers: 127.0.0.1:9092
app:
  topic:
    foo: frankfeekr

四、pom 依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.frankfeekr</groupId>
    <artifactId>springboot-kafka-sample</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-kafka-sample</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
            <version>2.2.7.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

参考资料