贴一下我根据官网的例子，写的kafka的hello world列子，完整的代码如下
pom.xml如下
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.demo</groupId> <artifactId>kafak-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>kafak-demo</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> <version>0.9.0.0</version> </dependency> </dependencies> </project> 生产者代码 package com.fosun.kafak_demo.main; import java.util.Properties; import org.apache.kafka.clients.producer.KafkaProducer; import org.apache.kafka.clients.producer.Producer; import org.apache.kafka.clients.producer.ProducerRecord; import com.fosun.kafak_demo.util.Constants; public class KafkaProducerTest{ private KafkaProducerTest(){ } void produce() { Properties props = new Properties(); props.put("bootstrap.servers", "dmeo-hadoop1.fx01:9092,demo-hadoop2.fx01:9092"); 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<String, String>(props); for(int i = 3844; i < 1000000; i++){ System.out.printf("produce %d message\n",i); producer.send(new ProducerRecord<String, String>(Constants.TOPIC, i%4 , "hello"+Integer.toString(i), "hello"+Integer.toString(i))); try { Thread.sleep(100); } catch (InterruptedException e) { } } producer.close(); } public static void main( String[] args ) { new KafkaProducerTest().produce(); } } 消费者 package com.fosun.kafak_demo.main; import java.util.Arrays; import java.util.Properties; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka.clients.consumer.KafkaConsumer; import org.apache.kafka.common.TopicPartition; import com.fosun.kafak_demo.util.Constants; public class KafkaConsumerTest { private KafkaConsumerTest() { } void consume() { Properties props = new Properties(); props.put("bootstrap.servers", "demo-hadoop1.fx01:9092,demo-hadoop2.fx01:9092"); props.put("group.id", "testsssss"); props.put("enable.auto.commit", "false"); props.put("auto.commit.interval.ms", "1000"); props.put("auto.offset.reset", "earliest"); props.put("session.timeout.ms", "30000"); 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); //针对某个topic // consumer.subscribe(Arrays.asList(Constants.TOPIC)); //读具体分区 TopicPartition partition0 = new TopicPartition(Constants.TOPIC,0); consumer.assign(Arrays.asList(partition0)); boolean flag = true; while (flag) { ConsumerRecords<String, String> records = consumer.poll(100); for (ConsumerRecord<String, String> record : records) System.out.printf("offset = %d, key = %s, value = %s\n", record.offset(), record.key(), record.value()); } consumer.close(); } public static void main(String[] args) { new KafkaConsumerTest().consume(); } }