本文共 4895 字，大约阅读时间需要 16 分钟。

1、消费者

package com.asiainfo.group.kafka.consumer;import java.io.FileReader;import java.util.ArrayList;import java.util.List;import java.util.Map;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.clients.consumer.OffsetAndMetadata;import org.apache.kafka.clients.consumer.OffsetCommitCallback;import org.apache.kafka.common.TopicPartition;public class ConsumerDemo {	private static final String PATH="D:/development-software/eclipse-mars/default/java_test/src/main/java/com/asiainfo/group/kafka/consumer/";	private static KafkaConsumer
   
     consumer;	static{		try {			Properties p = new Properties();			p.load(new FileReader(PATH+"consumer.properties"));			consumer = new KafkaConsumer
    
     (p);		} catch (Exception e) {			e.printStackTrace();		}			}			public static void main(String[] args){				new Thread(new Runnable() {						@Override			public void run() {				List
     
       topics = new ArrayList
      
       ();				topics.add("okk");				consumer.subscribe(topics);												try {					while(true){						ConsumerRecords
       
         records = consumer.poll(3000);						System.err.println("收到了"+records.count()+"条消息");						for (ConsumerRecord
        
          record : records) { System.err.println("topic:"+record.topic()); System.err.println("partition:"+record.partition()); System.err.println("offset:"+record.offset()); System.err.println("key:"+record.key()); System.err.println("value:"+record.value()); } //同步提交：会一直尝试直至提交成功,会一直阻塞 //consumer.commitSync(); //异步提交：不会重试，原因是因为重试过程中可能有更大的偏移量提交 consumer.commitAsync(new OffsetCommitCallback() { @Override public void onComplete(Map
         
           arg0, Exception arg1) { System.err.println("异步提交偏移量成功！"); } }); //同步提交结合异步提交 //如果一切正常，就用异步提交，即使此次提交不成功，下次提交总会成功的 //如果关闭消费者，就没有下一次了，则用同步提交，一直尝试到提交成功为止，类似下面的代码 /*try{ consumer.commitSync(); } finally{ consumer.close(); }*/ } } catch (Exception e) { e.printStackTrace(); } finally{ consumer.close(); } } }).start(); try { Thread.sleep(10000); } catch (InterruptedException e) { e.printStackTrace(); } //wakeup方法是唯一能够打断consumer.poll的方法，并使其抛出异常跳出while(true),然后进入finally关闭consumer consumer.wakeup(); }}
         
        
       
      
     
    
   

2、生产者

package com.asiainfo.group.kafka.producer;import java.io.FileReader;import java.util.Properties;import java.util.concurrent.ExecutionException;import org.apache.kafka.clients.producer.Callback;import org.apache.kafka.clients.producer.KafkaProducer;import org.apache.kafka.clients.producer.ProducerRecord;import org.apache.kafka.clients.producer.RecordMetadata;public class ProductDemo {	private static final String PATH="D:/development-software/eclipse-mars/default/java_test/src/main/java/com/asiainfo/group/kafka/producer/";	private static KafkaProducer
   
     producer;	static{		try {			Properties p = new Properties();			p.load(new FileReader(PATH+"producer.properties"));			producer = new KafkaProducer
    
     (p);		} catch (Exception e) {			e.printStackTrace();		}			}			/**	 * 发送并忘记（不关心是否到达）	 * @throws ExecutionException 	 * @throws InterruptedException 	 */	public void sendAndForget() throws Exception{		for (int i = 0; i < 10; i++) {			ProducerRecord
     
       record = new ProducerRecord<>("okk", "key"+i, "sendAndForget"+i);			producer.send(record);		}		producer.close();	}			public void syncSend() throws Exception{		long start = System.currentTimeMillis();		for (int i = 0; i < 1000; i++) {			ProducerRecord
      
        record = new ProducerRecord<>("test1", "key"+i, "syncSend"+i);			RecordMetadata recordMetadata = producer.send(record).get();			System.err.println("同步发送成功！");		}		System.err.println("同步发送耗时："+(System.currentTimeMillis()-start));		producer.close();			}		public void asyncSend(){		long start = System.currentTimeMillis();		for (int i = 0; i < 10; i++) {			ProducerRecord
       
         record = new ProducerRecord<>("test1", "key"+i, "asyncSend"+i);			producer.send(record, new Callback() {				@Override				public void onCompletion(RecordMetadata arg0, Exception arg1) {					System.err.println("异步发送成功！");				}			});					}		System.err.println("异步发送耗时："+(System.currentTimeMillis()-start));		producer.close();	}		@SuppressWarnings("resource")	public static void main(String[] args) throws Exception{		new ProductDemo().sendAndForget();		//new ProductDemo().syncSend();		//new ProductDemo().asyncSend();									}}
       
      
     
    
   

3、生产者配置文件

bootstrap.servers=192.168.0.108:9092key.serializer=org.apache.kafka.common.serialization.StringSerializervalue.serializer=org.apache.kafka.common.serialization.StringSerializer

4、消费者配置文件

bootstrap.servers=192.168.0.108:9092key.deserializer=org.apache.kafka.common.serialization.StringDeserializervalue.deserializer=org.apache.kafka.common.serialization.StringDeserializergroup.id=groupByJava1enable.auto.commit=false

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