Cara menggunakan Java untuk membangunkan aplikasi analisis data masa nyata berdasarkan Apache Kafka

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import java.util.Properties;

public class KafkaProducerExample {
    public static void main(String[] args) {
        String kafkaServers = "localhost:9092";
        String topic = "data_topic";

        Properties properties = new Properties();
        properties.put("bootstrap.servers", kafkaServers);
        properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

        KafkaProducer<String, String> producer = new KafkaProducer<>(properties);

        // 发送数据
        for (int i = 0; i < 10; i++) {
            String data = "data" + i;
            ProducerRecord<String, String> record = new ProducerRecord<>(topic, data);
            producer.send(record);
        }

        // 关闭生产者连接
        producer.close();
    }
}

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.serialization.StringDeserializer;
import java.util.Collections;
import java.util.Properties;

public class KafkaConsumerExample {
    public static void main(String[] args) {
        String kafkaServers = "localhost:9092";
        String topic = "data_topic";

        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaServers);
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "data_group");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());

        Consumer<String, String> consumer = new KafkaConsumer<>(properties);
        consumer.subscribe(Collections.singletonList(topic));

        // 持续消费数据
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(100);
            records.forEach(record -> {
                String data = record.value();
                // 进行实时数据分析
                System.out.println("Received data: " + data);
            });
        }
    }
}

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.serialization.StringDeserializer;
import java.util.Collections;
import java.util.Properties;

public class KafkaRealTimeAnalysisExample {
    public static void main(String[] args) {
        String kafkaServers = "localhost:9092";
        String topic = "data_topic";

        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaServers);
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "data_group");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());

        Consumer<String, String> consumer = new KafkaConsumer<>(properties);
        consumer.subscribe(Collections.singletonList(topic));

        // 持续消费数据并进行实时分析
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(100);
            records.forEach(record -> {
                String data = record.value();
                // 实时分析代码
                // 例如，计算数据的平均值
                double avg = calculateAverage(data);
                System.out.println("Received data: " + data);
                System.out.println("Average: " + avg);
            });
        }
    }

    private static double calculateAverage(String data) {
        // 实现计算平均值的逻辑
        // ...
        return 0; // 返回计算结果
    }
}