Java连接Kafka创建Consumer

首先Maven依赖

		<--==========KAFKA===========-->
		<dependency>
			<groupId>org.apache.kafka</groupId>
			<artifactId>kafka_2.12</artifactId>
			<version>2.2.0</version>
		</dependency>

新建KafkaConsumerSimple类

package com.aas.demo.Kafka;

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

import org.apache.kafka.clients.consumer.ConsumerConfig;
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.common.serialization.StringDeserializer;

public class KafkaConsumerSimple {
    public static void main(String[] args) {

        // 设置配置信息
        Properties props = new Properties();
        props.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
                "cdh01:9092,cdh02:9092,cdh03:9092");
        // Just a user-defined string to identify the consumer group
        props.put(ConsumerConfig.GROUP_ID_CONFIG, "test");
        // Enable auto offset commit
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true");
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
        props.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
                StringDeserializer.class.getName());
        props.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
                StringDeserializer.class.getName());

        try (KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props)) {
            //要消费的主题列表 配置可以多个
            consumer.subscribe(Arrays.asList("testTopic"));
            while (true) {
                try {
                    ConsumerRecords<String, String> records = consumer.poll(100);
                    for (ConsumerRecord<String, String> record : records) {
                    //数据处理部分
                        System.out.printf("Offset = %d\n", record.offset());
                        System.out.printf("Key    = %s\n", record.key());
                        System.out.printf("Value  = %s\n", record.value());
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

然后先建立testTopic 再创建生产者，最后Run起来消费者
（关于生产者请查看上一篇博客）
控制台打印信息