47 lines
1.8 KiB
Java
47 lines
1.8 KiB
Java
package com.mobai.demo;
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import org.apache.kafka.clients.consumer.KafkaConsumer;
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import org.apache.kafka.clients.consumer.ConsumerConfig;
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import org.apache.kafka.clients.consumer.ConsumerRecords;
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import org.apache.kafka.clients.consumer.ConsumerRecord;
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import org.apache.kafka.common.serialization.StringDeserializer;
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import java.util.Collections;
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import java.util.Properties;
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/**
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* demo消费者
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*/
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public class KafkaSimpleConsumer {
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public static void main(String[] args) {
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String bootstrapServers = "127.0.0.1:9092";
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String groupId = "test-group";
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String topic = "testTopic";
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// 设置消费者属性
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Properties properties = new Properties();
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properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
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properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
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properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
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properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, groupId);
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properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
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// 创建消费者
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KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
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// 订阅主题
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consumer.subscribe(Collections.singleton(topic));
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// 拉取并处理消息
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while(true) {
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ConsumerRecords<String, String> records = consumer.poll(5);
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for (ConsumerRecord<String, String> record : records) {
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System.out.printf("Received message: key = %s, value = %s, offset = %d%n",
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record.key(), record.value(), record.offset());
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}
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}
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// 注意：实际应用中需要合适的退出机制
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}
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}
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