Java中的消息中间件与异步通信实现

package cn.juwatech.example;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import java.util.Properties;
public class KafkaProducerExample {
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        Producer<String, String> producer = new KafkaProducer<>(props);
        try {
            for (int i = 0; i < 10; i++) {
                String message = "Message " + i;
                producer.send(new ProducerRecord<>("my-topic", message));
                System.out.println("Sent message: " + message);
                Thread.sleep(1000); // Simulate delay
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            producer.close();
        }
    }
}

package cn.juwatech.example;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
public class CompletableFutureExample {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
            // Simulate a task that takes time
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return "Hello, CompletableFuture!";
        });
        // Block and get the result asynchronously
        String result = future.get();
        System.out.println(result);
    }
}