spring整合kafka如何进行消息过滤 - 问答

在Spring整合Kafka中，可以使用Kafka Message Filter来实现消息过滤。Kafka Message Filter是一个基于Kafka消费者API的过滤器，可以在消费消息之前对其进行过滤。以下是实现消息过滤的步骤：

引入依赖

在项目的pom.xml文件中添加Kafka客户端依赖：

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
    <version>2.7.4</version>
</dependency>

配置Kafka消费者

在Spring配置文件中配置Kafka消费者，例如：

spring:
  kafka:
    consumer:
      group-id: my-group
      bootstrap-servers: localhost:9092
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer

创建Kafka Message Filter

创建一个实现org.apache.kafka.clients.consumer.ConsumerFilter接口的类，用于实现消息过滤逻辑。例如：

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

public class MyMessageFilter implements ConsumerFilter<String, String> {

    @Override
    public ConsumerRecords<String, String> filter(Consumer<String, String> consumer, ConsumerRecords<String, String> records) {
        ConsumerRecords<String, String> filteredRecords = new ConsumerRecords<>();
        for (ConsumerRecord<String, String> record : records) {
            // 在这里实现过滤逻辑
            if (record.value().contains("filtered")) {
                filteredRecords.add(record);
            }
        }
        return filteredRecords;
    }
}

配置Kafka消费者使用自定义Filter

在Spring配置文件中配置Kafka消费者使用自定义的Filter：

spring:
  kafka:
    consumer:
      group-id: my-group
      bootstrap-servers: localhost:9092
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      properties:
        org.apache.kafka.clients.consumer.ConsumerConfig.GROUP_ID_CONFIG: my-group
        org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG: localhost:9092
        org.apache.kafka.clients.consumer.ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG: org.apache.kafka.common.serialization.StringDeserializer
        org.apache.kafka.clients.consumer.ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG: org.apache.kafka.common.serialization.StringDeserializer
        org.apache.kafka.clients.consumer.ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG: false
        org.apache.kafka.clients.consumer.ConsumerConfig.AUTO_OFFSET_RESET_CONFIG: earliest
        org.apache.kafka.clients.consumer.ConsumerConfig.MAX_POLL_RECORDS_CONFIG: 500
        org.apache.kafka.clients.consumer.ConsumerConfig.FILTER_CLASS_CONFIG: com.example.MyMessageFilter

现在，当消费者消费消息时，MyMessageFilter将会对消息进行过滤，只有满足过滤条件的消息才会被消费。

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