循环遍历KStream对象并打印出它的值

import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.kstream.KStream;
import java.util.Properties;

public class KStreamExample {
    public static void main(String[] args) {
        // 设置Kafka集群连接信息
        Properties props = new Properties();
        props.put(StreamsConfig.APPLICATION_ID_CONFIG, "kstream-example");
        props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");

        // 创建Kafka Streams应用程序
        StreamsBuilder builder = new StreamsBuilder();

        // 创建KStream对象
        KStream<String, String> kStream = builder.stream("input-topic");

        // 循环遍历KStream对象并打印出值
        kStream.foreach((key, value) -> System.out.println(value));

        // 构建Kafka Streams应用程序并启动
        KafkaStreams streams = new KafkaStreams(builder.build(), props);
        streams.start();
    }
}