3

我想从 application.properties 加载我的 spring-kafka 属性，并且必须使用 spring 自动配置加载。我的问题是由以下原因引起的：java.lang.IllegalStateException：没有可用的确认作为参数，侦听器容器必须有一个手动确认模式来填充确认但是我已经在属性文件 spring.kafka.listener.ack-mode= 中设置了它但是，在此属性中手动立即，因为它是我的自定义 fooKafkaListenerContainerFactory 它无法选择此设置。我想要的是不手动设置它应该从我的application.properies中获取。@Gary Russell 感谢您的帮助。

我的代码如下所示

package com.foo;

import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.kafka.ConcurrentKafkaListenerContainerFactoryConfigurer;
import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.support.serializer.JsonDeserializer;

import com.foo.FooKafkaDTO;

@Configuration
public class KafkaConsumerConfig {

    @Autowired
    private KafkaProperties kafkaProperties;

    @Bean
    @ConditionalOnMissingBean(ConsumerFactory.class)
    public ConsumerFactory<?, ?> kafkaConsumerFactory() {

        return new DefaultKafkaConsumerFactory<>(kafkaProperties.buildConsumerProperties());
    }

    @Bean
    @ConditionalOnMissingBean(name = "kafkaListenerContainerFactory")
    public ConcurrentKafkaListenerContainerFactory<?, ?> kafkaListenerContainerFactory(
            ConcurrentKafkaListenerContainerFactoryConfigurer configurer,
            ConsumerFactory<Object, Object> kafkaConsumerFactory) {

        ConcurrentKafkaListenerContainerFactory<Object, Object> factory = new ConcurrentKafkaListenerContainerFactory<Object, Object>();
        configurer.configure(factory, kafkaConsumerFactory);
        return factory;
    }

    @Bean
    public ConsumerFactory<String, FooKafkaDTO> fooConsumerFactory() {

        return new DefaultKafkaConsumerFactory<>(
                kafkaProperties.buildConsumerProperties(), new StringDeserializer(), new JsonDeserializer<>(FooKafkaDTO.class));
    }

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, FooKafkaDTO> fooKafkaListenerContainerFactory(
            ConcurrentKafkaListenerContainerFactoryConfigurer configurer,
            ConsumerFactory<String, FooKafkaDTO> fooConsumerFactory) {

        ConcurrentKafkaListenerContainerFactory<String, FooKafkaDTO> factory =
                new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(fooConsumerFactory());
        return factory;
    }
}


Here are my properties 

spring.kafka.bootstrap-servers=localhost:9092
spring.kafka.listener.ack-mode=manual-immediate
spring.kafka.consumer.group-id=group_id
spring.kafka.consumer.auto-offset-reset=latest
spring.kafka.consumer.enable.auto.commit=false
spring.kafka.consumer.key-deserialize=org.springframework.kafka.support.serializer.JsonDeserializer
spring.kafka.consumer.value-deserialize=org.springframework.kafka.support.serializer.JsonDeserializer


Here is my listener

@Service
public class Consumer {

    private static final Log LOG = LogFactory.getLog(Consumer.class);

    @KafkaListener(
            topicPartitions = {@TopicPartition(topic = "outbox.foo",
                    partitionOffsets = @PartitionOffset(partition = "0", initialOffset = "0"))},
            groupId = "group_id",
            containerFactory = "fooKafkaListenerContainerFactory")
    public void consume(@Payload FooKafkaDTO fooKafkaDTO, Acknowledgment acknowledgment,
            @Headers MessageHeaders headers) {

        LOG.info("offset:::" + Long.valueOf(headers.get(KafkaHeaders.OFFSET).toString()));
        LOG.info(String.format("$$ -> Consumed Message -> %s", fooKafkaDTO));
        acknowledgment.acknowledge();

    }
}
4

1 回答 1

4

在浏览完 spring-kafka spring-kafka-official-documentation 的文档后！我可以找到替换整个样板代码的代码。我已经简化了我的 KafkaConsumerConfig 类，它现在看起来像下面这样。

package com.foo

import java.util.Map;

import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.support.serializer.JsonDeserializer;

import com.foo.FooKafkaDTO;

@Configuration
public class KafkaConsumerConfig {

    @Bean
    public DefaultKafkaConsumerFactory fooDTOConsumerFactory(KafkaProperties properties) {

        Map<String, Object> props = properties.buildConsumerProperties();
        return new DefaultKafkaConsumerFactory(props,
                new JsonDeserializer<>(String.class)
                        .forKeys()
                        .ignoreTypeHeaders(),
                new JsonDeserializer<>(FooKafkaDTO.class)
                        .ignoreTypeHeaders());

    }
}
于 2020-03-31T23:44:45.133 回答