在Java中,可以使用Kafka的Consumer API來(lái)過(guò)濾消息。Consumer API提供了一種靈活的方式來(lái)過(guò)濾消息,可以根據(jù)消息的鍵值、分區(qū)、偏移量等屬性進(jìn)行過(guò)濾。
以下是一些常用的過(guò)濾方法:
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "test-group");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList("topic1"), new ConsumerRebalanceListener() {
@Override
public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
for (TopicPartition partition : partitions) {
// 設(shè)置鍵值過(guò)濾條件
consumer.seek(partition, 0);
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
// 撤銷(xiāo)鍵值過(guò)濾條件
}
});
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "test-group");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList("topic1"), new ConsumerRebalanceListener() {
@Override
public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
for (TopicPartition partition : partitions) {
if (partition.partition() == 1) {
// 過(guò)濾指定分區(qū)
consumer.seek(partition, 0);
}
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
// 撤銷(xiāo)分區(qū)過(guò)濾條件
}
});
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "test-group");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList("topic1"), new ConsumerRebalanceListener() {
@Override
public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
for (TopicPartition partition : partitions) {
// 設(shè)置偏移量過(guò)濾條件
consumer.seek(partition, 10);
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
// 撤銷(xiāo)偏移量過(guò)濾條件
}
});
通過(guò)以上方法,可以實(shí)現(xiàn)對(duì)Kafka消息的過(guò)濾。根據(jù)具體需求,可以選擇適合的過(guò)濾方法。