有限元分析的簡單示例，Java Kafka 簡單示例

2023-10-12 阅读 28 评论 0

摘要：Java Kafka 簡單示例簡介 ????Java kafka 簡單代碼示例 maven依賴配置  <dependency><groupId>org.apache.kafka</groupId><artifactId>kafka-clients</artifactId><version>0.11.0.0</version> </depende

Java Kafka 簡單示例

簡介

????Java kafka 簡單代碼示例

maven依賴配置

<!-- kafka -->
<dependency><groupId>org.apache.kafka</groupId><artifactId>kafka-clients</artifactId><version>0.11.0.0</version>
</dependency>

kakfa生產和消費者生成

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;import java.util.*;/*** @author lw1243925457*/
public class KafkaUtil {public static KafkaConsumer<String, String> createConsumer(String servers, String topic) {Properties properties = new Properties();properties.put("bootstrap.servers", servers);properties.put("group.id", "group-1");properties.put("enable.auto.commit", "false");properties.put("auto.commit.interval.ms", "1000");properties.put("auto.offset.reset", "earliest");properties.put("session.timeout.ms", "30000");properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);kafkaConsumer.subscribe(Arrays.asList(topic));return kafkaConsumer;}public static void readMessage(KafkaConsumer<String, String> kafkaConsumer, int timeout) {while (true) {ConsumerRecords<String, String> records = kafkaConsumer.poll(timeout);for (ConsumerRecord<String, String> record : records) {String value = record.value();kafkaConsumer.commitAsync();System.out.println(value);}}}public static KafkaProducer<String, String> createProducer(String servers) {Properties properties = new Properties();properties.put("bootstrap.servers", servers);properties.put("acks", "all");properties.put("retries", 0);properties.put("batch.size", 16384);properties.put("linger.ms", 1);properties.put("buffer.memory", 33554432);properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");return new KafkaProducer<String, String>(properties);}public static void send(KafkaProducer<String, String> producer, String topic, String message) {producer.send(new ProducerRecord<String, String>(topic, message));}
}

運行

public class Main {public static void main(String[] args) {String servers = "localhost:9092,localhost:9093,localhost:9094";String topic = "TestTopic";String message = "test";KafkaProducer<String, String> producer = KafkaUtil.createProducer(servers);KafkaUtil.send(producer, topic, message);KafkaConsumer<String, String> consumer = KafkaUtil.createConsumer(servers, topic);KafkaUtil.readMessage(consumer, 100);}
}