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Java使用kafka发送和生产消息的示例

运维开发网 https://www.qedev.com 2020-07-09 11:46 出处:网络 作者: will的猜想
1. maven依赖包 <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId>

1. maven依赖包

<dependency> 
 <groupId>org.apache.kafka</groupId> 
 <artifactId>kafka-clients</artifactId> 
 <version>0.9.0.1</version> 
</dependency> 

2. 生产者代码

package com.lnho.example.kafka;  
import org.apache.kafka.clients.producer.KafkaProducer; 
import org.apache.kafka.clients.producer.Producer; 
import org.apache.kafka.clients.producer.ProducerRecord;   
import java.util.Properties;   
public class KafkaProducerExample { 
 public static void main(String[] args) { 
  Properties props = new Properties(); 
  props.put("bootstrap.servers", "master: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); 
  for(int i = 0; i < 100; i++) 
   producer.send(new ProducerRecord<>("topic1", Integer.toString(i), Integer.toString(i)));   
  producer.close(); 
 } 
} 

3. 消费者代码

package com.lnho.example.kafka;   
import org.apache.kafka.clients.consumer.ConsumerRecord; 
import org.apache.kafka.clients.consumer.ConsumerRecords; 
import org.apache.kafka.clients.consumer.KafkaConsumer; 
import java.util.Arrays; 
import java.util.Properties;   
public class KafkaConsumerExample { 
 public static void main(String[] args) { 
  Properties props = new Properties(); 
  props.put("bootstrap.servers", "master:9092"); 
  props.put("group.id", "test"); 
  props.put("enable.auto.commit", "true"); 
  props.put("auto.commit.interval.ms", "1000"); 
  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<>(props); 
  consumer.subscribe(Arrays.asList("topic1")); 
  while (true) { 
   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()); 
  } 
 } 
} 

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