代码实现
public class CustomConsumer {
public static void main(String[] args) {
Properties props = new Properties();
// 定义kakfa 服务的地址,不需要将所有broker指定上
props.put("bootstrap.servers", "hcmaster:9092");
// 制定消费者组id
props.put("group.id", "g1");
// 是否自动确认offset
props.put("enable.auto.commit", "true");
// 自动确认offset的时间间隔
props.put("auto.commit.interval.ms", "1000");
// key的序列化类
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
// value的序列化类
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
// 定义consumer
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
// 消费者订阅的topic, 可同时订阅多个
consumer.subscribe(Arrays.asList("first","second"));
while (true) {
// 读取数据,读取超时时间为100ms
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord<String, String> record : records) {
System.out.printf("topic = %s , partition = %s , offset = %d, key = %s, value = %s%n",record.topic(), record.partition(), record.offset(), record.key(), record.value());
}
}
}
}
测试
在终端分别启动fist和second两个Producer
发送数据顺序:
- first发送aa、bb
- second发送11、22
- first发送33
- second发送cc
Intellij控制台输出结果: