java连接kafka测试

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：