kafka安装及运行
- 官网下载0.10.1.0版本,java1.8
- 启动zookeeper
bin/zookeeper-server-start.sh config/zookeeper.properties
- 启动broker
bin/kafka-server-start.sh config/server.properties
- 创建一个topic
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
- 启动consumer
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
- 启动producer
bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
java代码测试
pom文件
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.10.1.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
<version>0.10.1.0</version>
</dependency>
producer-demo1
import java.util.Properties;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
public class KafkaProducerDemo1 {
public static void main(String[] args) {
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<>(props);
char c = 'a';
for(int i = 1; i < 2; i++) {
String k = new String(new char[]{c});
String v = k + k;
producer.send(new ProducerRecord<String, String>("test", k, v));
c++;
}
producer.close();
}
}
consumer-demo1
每次重新创建一个groupid,从开始的offset读取message
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import java.util.Arrays;
import java.util.UUID;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.ConsumerRecord;
public class KafkaConsumerDemo1 {
public static void main(String[] args) throws InterruptedException, UnsupportedEncodingException {
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, UUID.randomUUID().toString());
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
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<String, String>(props);
try {
consumer.subscribe(Arrays.asList("test"));
while(true) {
ConsumerRecords<String, String> records = consumer.poll(100);
for (ConsumerRecord<String, String> record : records) {
System.out.println(record.offset() + ": " + record.value());
}
Thread.sleep(1000);
}
} finally {
consumer.close();
}
}
}
consumer-demo2
固定groupid,从指定的offset读取message
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import java.util.Arrays;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.TopicPartition;
public class KafkaConsumerDemo2 {
public static void main(String[] args) throws InterruptedException, UnsupportedEncodingException {
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "group_test_1");
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put("enable.auto.commit", "false");
props.put("auto.commit.interval.ms", "1000");
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<String, String>(props);
try {
String topic = "test";
long offset = 10;
TopicPartition partition0 = new TopicPartition(topic, 0);
consumer.assign(Arrays.asList(partition0));
consumer.seek(partition0, offset);
while(true) {
ConsumerRecords<String, String> records = consumer.poll(100);
for (ConsumerRecord<String, String> record : records) {
System.out.println(record.offset() + ": " + record.value());
}
consumer.commitSync();
Thread.sleep(1000);
}
} finally {
consumer.close();
}
}
}
consumer-demo3
固定groupid,自己维护offset的位置信息
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import java.util.Arrays;
import java.util.List;
import java.util.Collections;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.common.TopicPartition;
public class KafkaConsumerDemo3 {
public static void main(String[] args) throws InterruptedException, UnsupportedEncodingException {
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "group_test_1");
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put("enable.auto.commit", "false");
props.put("auto.commit.interval.ms", "1000");
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<String, String>(props);
try {
consumer.subscribe(Arrays.asList("test"));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(100);
for (TopicPartition partition : records.partitions()) {
List<ConsumerRecord<String, String>> partitionRecords = records.records(partition);
for (ConsumerRecord<String, String> record : partitionRecords) {
System.out.println(record.offset() + ": " + record.value());
}
long lastOffset = partitionRecords.get(partitionRecords.size() - 1).offset();
consumer.commitSync(Collections.singletonMap(partition, new OffsetAndMetadata(lastOffset + 1)));
}
}
} finally {
consumer.close();
}
}
}
kafka-streaming-demo1
import java.util.Map;
import java.util.HashMap;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.kstream.KStreamBuilder;
import org.apache.kafka.common.serialization.Serdes;
public class KafkaStreamingDemo1 {
public static void main(String[] args) {
Map<String, Object> props = new HashMap<>();
props.put(StreamsConfig.APPLICATION_ID_CONFIG, "my-stream-processing-application");
props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
props.put(StreamsConfig.KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
props.put(StreamsConfig.VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
StreamsConfig config = new StreamsConfig(props);
KStreamBuilder builder = new KStreamBuilder();
builder.stream("test").filter((k,v) -> (v.equals("b"))).print();
KafkaStreams streams = new KafkaStreams(builder, config);
streams.start();
}
}
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