在Java中,可以使用Kafka的Consumer API來過濾消息。Consumer API提供了一種靈活的方式來過濾消息,可以根據消息的鍵值、分區、偏移量等屬性進行過濾。
以下是一些常用的過濾方法:
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) {
// 設置鍵值過濾條件
consumer.seek(partition, 0);
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
// 撤銷鍵值過濾條件
}
});
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) {
// 過濾指定分區
consumer.seek(partition, 0);
}
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
// 撤銷分區過濾條件
}
});
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) {
// 設置偏移量過濾條件
consumer.seek(partition, 10);
}
}
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
// 撤銷偏移量過濾條件
}
});
通過以上方法,可以實現對Kafka消息的過濾。根據具體需求,可以選擇適合的過濾方法。