java连接kafka测试

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①进入到kafka文件夹中修改配置文件：vim config/server.properties

②启动zookeeper：

bin/zookeeper-server-start.sh config/zookeeper.properties
端口2181是ZooKeeper的默认端口，可以通过编辑文件config/zookeeper.properties 中的clientPort来修改监听端口。

③ 启动Kafka Broker

bin/kafka-server-start.sh config/server.properties
④ 创建一个Topic 名称为HelloWorld

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 \
> --partitions 1 --topic HelloWorld
⑤校验Topic是否创建成功

bin/kafka-topics.sh --list --zookeeper localhost:2181
⑥配置pom文件：

<!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka -->
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.11.0.0</version>
</dependency>
⑦编写一个producer文件：

package com.winter.kafka;

import java.util.Properties;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;

public class ProducerDemo {

public static void main(String[] args){
Properties properties = new Properties();
properties.put("bootstrap.servers", "47.91.214.23:9092");
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");
Producer<String, String> producer = null;
try {
producer = new KafkaProducer<String, String>(properties);
// producer.send(new ProducerRecord<String, String>("HelloWorld","aaaaaaaaaaaa"));
for (int i = 0; i < 100; i++) {
String msg = "This is Message " + i;
producer.send(new ProducerRecord<String, String>("HelloWorld", msg));
System.out.println("Sent:" + msg);
}
} catch (Exception e) {
e.printStackTrace();

} finally {
producer.close();
}

}
}
⑧配置一个customer文件：

package com.winter.kafka;

import java.util.Arrays;
import java.util.Properties;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

public class ConsumerDemo {

public static void main(String[] args) throws InterruptedException {
Properties properties = new Properties();
properties.put("bootstrap.servers", "47.91.214.23:9092");
properties.put("group.id", "group-1");
properties.put("enable.auto.commit", "true");
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<>(properties);
kafkaConsumer.subscribe(Arrays.asList("HelloWorld"));
while (true) {
ConsumerRecords<String, String> records = kafkaConsumer.poll(100);
for (ConsumerRecord<String, String> record : records) {
System.out.printf("offset = %d, value = %s", record.offset(), record.value());
System.out.println("=====================>");
}
}

}
}

先动customer 文件，然后启动producer文件，然后观察控制台：

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版权声明：本文为CSDN博主「july_young」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/july_young/article/details/81704876

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