kafal推送消息demo
时间: 2023-07-23 16:34:35 浏览: 47
Kafka是一个分布式的消息队列系统,可以用于处理大量的实时数据。下面是一个使用Java编写的Kafka消息生产者和消费者的示例代码。
Kafka消息生产者示例代码:
```java
import java.util.Properties;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
public class KafkaProducerDemo {
public static void main(String[] args) throws Exception{
String topicName = "test-topic";
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");
KafkaProducer<String, String> producer = new KafkaProducer<>(props);
for(int i = 0; i < 10; i++)
producer.send(new ProducerRecord<>(topicName, Integer.toString(i), Integer.toString(i)));
System.out.println("Message sent successfully");
producer.close();
}
}
```
Kafka消息消费者示例代码:
```java
import java.util.Collections;
import java.util.Properties;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.KafkaConsumer;
public class KafkaConsumerDemo {
public static void main(String[] args) throws Exception {
String topicName = "test-topic";
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("group.id", "test-group");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Collections.singletonList(topicName));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(100);
for (ConsumerRecord<String, String> record : records)
System.out.printf("offset = %d, key = %s, value = %s\n", record.offset(), record.key(), record.value());
}
}
}
```
这里的生产者将10个数字发送到名为“test-topic”的主题中,消费者从该主题中读取这些数字并将其打印到控制台上。注意,这只是一个简单的示例,实际使用中需要根据具体的需求进行修改。