要将Kafka数据写入Redis，可以按照以下步骤进行：

创建一个Kafka消费者，用于从Kafka主题中读取数据。创建一个Redis客户端，用于与Redis进行交互。在消费者中，解析Kafka消息，并将相应的数据写入Redis。

以下是一个示例代码，展示了如何将Kafka数据写入Redis：

import org.apache.kafka.clients.consumer.*;import org.apache.kafka.common.serialization.StringDeserializer;import redis.clients.jedis.Jedis;import java.util.Collections;import java.util.Properties;public class KafkaToRedisExample {private static final String KAFKA_BOOTSTRAP_SERVERS = "localhost:9092";private static final String KAFKA_TOPIC = "your-kafka-topic";private static final String REDIS_HOST = "localhost";private static final int REDIS_PORT = 6379;public static void main(String[] args) {// 创建Kafka消费者配置Properties kafkaProps = new Properties();kafkaProps.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_BOOTSTRAP_SERVERS);kafkaProps.put(ConsumerConfig.GROUP_ID_CONFIG, "kafka-to-redis-example-group");kafkaProps.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());kafkaProps.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());// 创建Redis客户端Jedis jedis = new Jedis(REDIS_HOST, REDIS_PORT);// 创建Kafka消费者KafkaConsumer<String, String> consumer = new KafkaConsumer<>(kafkaProps);consumer.subscribe(Collections.singletonList(KAFKA_TOPIC));// 持续从Kafka消费消息并写入Rediswhile (true) {ConsumerRecords<String, String> records = consumer.poll(100);for (ConsumerRecord<String, String> record : records) {// 解析Kafka消息String key = record.key();String value = record.value();// 写入Redisjedis.set(key, value);System.out.println("Wrote to Redis: " + key + " - " + value);}// 提交消费位移consumer.commitAsync();}}}

请根据你的实际情况修改KAFKA_BOOTSTRAP_SERVERS、KAFKA_TOPIC、REDIS_HOST和REDIS_PORT等配置。这个示例代码使用了Kafka的Java客户端和Jedis库来连接Kafka和Redis。