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自动配置实现在 org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration
配置类为:
- @ConfigurationProperties(prefix = "spring.kafka")
- public class KafkaProperties {
-
- ......
-
- }
所以使用spring boot 默认的自动配置,kafka的配置都已spring.kafka开头,如:
- #kafka默认消费者配置
- spring.kafka.consumer.bootstrap-servers=192.168.0.15:9092
- spring.kafka.consumer.enable-auto-commit=false
- spring.kafka.consumer.auto-offset-reset=earliest
- #kafka默认生产者配置
- spring.kafka.producer.bootstrap-servers=192.168.0.15:9092
- spring.kafka.producer.acks=-1
- spring.kafka.client-id=kafka-producer
- spring.kafka.producer.batch-size=5
配置类org.springframework.boot.autoconfigure.kafka.KafkaProperties中并没有涵盖所有的org.apache.kafka.clients.producer.ProducerConfig和org.apache.kafka.clients.consumer.ConsumerConfig中的配置,这就导致某些特殊配置不能依赖spring boot自动创建,需要我们手动创建Poducer和comsumer。
生产端自定义配置例子:
- package cn.ztuo.bitrade.config;
-
- import java.util.HashMap;
- import java.util.Map;
-
- 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.annotation.EnableKafka;
- import org.springframework.kafka.core.DefaultKafkaProducerFactory;
- import org.springframework.kafka.core.KafkaTemplate;
- import org.springframework.kafka.core.ProducerFactory;
-
- @Configuration
- @EnableKafka
- public class KafkaProducerConfiguration {
-
- @Value("${spring.kafka.bootstrap-servers}")
- private String servers;
- @Value("${spring.kafka.producer.retries}")
- private int retries;
- @Value("${spring.kafka.producer.batch.size}")
- private int batchSize;
- @Value("${spring.kafka.producer.linger}")
- private int linger;
- @Value("${spring.kafka.producer.buffer.memory}")
- private int bufferMemory;
- // 创建生产者配置map,ProducerConfig中的可配置属性比spring boot自动配置要多
- public Map<String, Object> producerConfigs() {
- Map<String, Object> props = new HashMap<>();
- props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, servers);
- props.put(ProducerConfig.RETRIES_CONFIG, retries);
- props.put(ProducerConfig.BATCH_SIZE_CONFIG, batchSize);
- props.put(ProducerConfig.LINGER_MS_CONFIG, linger);
- props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, bufferMemory);
- // props.put(ProducerConfig.PARTITIONER_CLASS_CONFIG, "cn.ztuo.bitrade.kafka.kafkaPartitioner");
- props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
- props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
- return props;
- }
-
- /**
- * 不使用spring boot的KafkaAutoConfiguration默认方式创建的DefaultKafkaProducerFactory,重新定义
- * @return
- */
- public ProducerFactory<String, String> producerFactory() {
- return new DefaultKafkaProducerFactory<>(producerConfigs());
- }
- /**
- * 不使用spring boot的KafkaAutoConfiguration默认方式创建的KafkaTemplate,重新定义
- * @return
- */
- @Bean
- public KafkaTemplate<String, String> kafkaTemplate() {
- return new KafkaTemplate<String, String>(producerFactory());
- }
-
- }
消费端自定义配置例子:
- package cn.ztuo.bitrade.config;
-
- import java.util.HashMap;
- import java.util.Map;
-
- 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;
- //这里创建了对应类型的bean之后,org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration中的对应Bean定义将不起作用。
- @Configuration
- @EnableKafka
- public class KafkaConsumerConfiguration {
-
- @Value("${spring.kafka.bootstrap-servers}")
- private String servers;
- @Value("${spring.kafka.consumer.enable.auto.commit}")
- private boolean enableAutoCommit;
- @Value("${spring.kafka.consumer.session.timeout}")
- private String sessionTimeout;
- @Value("${spring.kafka.consumer.auto.commit.interval}")
- private String autoCommitInterval;
- @Value("${spring.kafka.consumer.group.id}")
- private String groupId;
- @Value("${spring.kafka.consumer.auto.offset.reset}")
- private String autoOffsetReset;
- @Value("${spring.kafka.consumer.concurrency}")
- private int concurrency;
- @Value("${spring.kafka.consumer.maxPollRecordsConfig}")
- private int maxPollRecordsConfig;
- //构造消费者属性map,ConsumerConfig中的可配置属性比spring boot自动配置要多
- public Map<String, Object> consumerConfigs() {
- Map<String, Object> propsMap = new HashMap<>();
- propsMap.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, servers);
- propsMap.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, enableAutoCommit);
- propsMap.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, autoCommitInterval);
- propsMap.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, sessionTimeout);
- propsMap.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
- propsMap.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
- propsMap.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
- propsMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, autoOffsetReset);
- propsMap.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, maxPollRecordsConfig);// 每个批次获取数
- return propsMap;
- }
- /**
- * 不使用spring boot默认方式创建的DefaultKafkaConsumerFactory,重新定义创建方式
- * @return
- */
- public ConsumerFactory<String, String> consumerFactory() {
- return new DefaultKafkaConsumerFactory<>(consumerConfigs());
- }
-
- @Bean
- public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>> kafkaListenerContainerFactory() {
- ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
- factory.setConsumerFactory(consumerFactory());
- factory.setConcurrency(concurrency);
- factory.setMissingTopicsFatal(false);
- factory.getContainerProperties().setPollTimeout(1500);
- factory.setBatchListener(true);
- return factory;
- }
-
- }
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