Question

上述kafka消费者应该从单个主题消费。我不能使用spring boot作为集成kafka consumer api和spring core web app ..

spring xml配置如下

<bean id="kafkaConsumerProperties" class="com.azuga.kafka.listeners.KafkaConsumerProperties">
    <constructor-arg type="java.lang.String" value="127.0.0.1:9092" />
    <constructor-arg type="java.lang.String" value="tdm-group" />
    <constructor-arg type="java.lang.String" value="dbStreamer.azuga.tripDriverMapping" />
</bean>
<bean id="kafkaListenerConfig" class="com.azuga.kafka.listeners.KafkaListenerConfig">
    <property name="kafkaConsumerProperties" ref="kafkaConsumerProperties" />
</bean>
<bean id="kafkaContainerFactory" class="com.azuga.kafka.listeners.KafkaListenerContainerFactory"
    factory-method="kafkaContainerFactory">
</bean>

这是创建ListenerContainerFactory

的类

@EnableKafka
public class KafkaListenerContainerFactory {

public static ConcurrentKafkaListenerContainerFactory<String, String> kafkaContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConcurrency(1);
    factory.setConsumerFactory(consumerFactory());
    factory.getContainerProperties().setPollTimeout(3000);
    return factory;
}

@SuppressWarnings("unchecked")
public static ConsumerFactory<String, String> consumerFactory() {
    return new DefaultKafkaConsumerFactory<>(KafkaListenerConfig.consumerProps(),
            KafkaListenerConfig.stringKeyDeserializer(), KafkaListenerConfig.stringKeyDeserializer());
}

}

这是我用@KafkaListener

注释的Listener类

package com.azuga.kafka.listeners;

import org.springframework.kafka.annotation.KafkaListener;
public class Listener {

@KafkaListener(topics = "dbStreamer.azuga.tripDriverMapping")
public void onMessage(String message) {
    System.out.println(message.toString());
}
}

这是KafkaListenerConfig类，它接受引导服务器，主题名称等。

@EnableKafka
public class KafkaListenerConfig {

private static KafkaConsumerProperties kafkaConsumerProperties;

public void setKafkaConsumerProperties(KafkaConsumerProperties kafkaConsumerProperties) {
    this.kafkaConsumerProperties = kafkaConsumerProperties;
}

public static Map<String, Object> consumerProps() {
    Map<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaConsumerProperties.getBootstrap());
    props.put(ConsumerConfig.GROUP_ID_CONFIG, kafkaConsumerProperties.getGroup());
    props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
    props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "100");
    props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "15000");
    return props;
}

public static Deserializer stringKeyDeserializer() {
    return new StringDeserializer();
}

}

Answer 1

您的应用程序有一些不寻常的配置。

但是我假设您错过masterList.add(list); masterList.add(list2); error: The method add(double[]) in the type ArrayList<double[]> is not applicable for the arguments (ArrayList<Double>) masterList[0] = list; masterList[1] = list2; error: The type of the expression must be an array type but it resolved to ArrayList<double[]>约为@EnableKafka级的事实。因此，根据Spring Framework文档，您必须使用@Configuration类：

AnnotationConfigWebApplicationContext

不幸的是，它不能仅使用普通的XML配置。

Spring Kafka没有为XML定义提供任何钩子。

不调用Kafka Listener方法。消费者不消费。

1 个答案: