Kafka: 生产者发送消息的三种方式

1.同步
public class ProducerMain2 {

public static void main(String[] args) throws Exception {
	// 配置信息
	Properties props = new Properties();
	props.put("bootstrap.servers", "localhost:9092");
	// 设置数据key的序列化处理类
	props.put("key.serializer",
			"org.apache.kafka.common.serialization.StringSerializer");
	// 设置数据value的序列化处理类
	props.put("value.serializer",
			"org.apache.kafka.common.serialization.StringSerializer");
	// 创建生产者实例
	Producer producer = new KafkaProducer<>(props);	
	// 创建一条新的记录，第一个参数为Topic名称
	ProducerRecord record = new ProducerRecord("test", "currenttime","now is :"+ new Date().toString());
	// 发送记录
	Future send=producer.send(record);
	RecordMetadata recordMetadata=send.get();
	System.out.println(recordMetadata);
	producer.close();
}

}
2异步：发送并忘记
package org.crazyit.cloud;

import java.util.Date;
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 org.apache.kafka.common.serialization.StringSerializer;

/**

• 生产者
• @author 杨恩雄

*/
public class ProducerMain {

public static void main(String[] args) throws Exception {
	// 配置信息
	Properties props = new Properties();
	props.put("bootstrap.servers", "localhost:9092");
	// 设置数据key的序列化处理类
	props.put("key.serializer",
			"org.apache.kafka.common.serialization.StringSerializer");
	// 设置数据value的序列化处理类
	props.put("value.serializer",
			"org.apache.kafka.common.serialization.StringSerializer");
	// 创建生产者实例
	Producer producer = new KafkaProducer<>(props);	
	// 创建一条新的记录，第一个参数为Topic名称
	ProducerRecord record = new ProducerRecord("test", "currenttime","now is :"+ new Date().toString());
	// 发送记录
	producer.send(record);
	producer.close();
}

}

3.异步回调
package org.crazyit.cloud;

import java.util.Date;
import java.util.Properties;
import java.util.concurrent.Future;

import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.serialization.StringSerializer;

/**

• 生产者
• @author 杨恩雄

*/
public class ProducerMain3 {

public static void main(String[] args) throws Exception {
	// 配置信息
	Properties props = new Properties();
	props.put("bootstrap.servers", "localhost:9092");
	// 设置数据key的序列化处理类
	props.put("key.serializer",
			"org.apache.kafka.common.serialization.StringSerializer");
	// 设置数据value的序列化处理类
	props.put("value.serializer",
			"org.apache.kafka.common.serialization.StringSerializer");
	// 创建生产者实例
	Producer producer = new KafkaProducer<>(props);	
	// 创建一条新的记录，第一个参数为Topic名称
	ProducerRecord record = new ProducerRecord("test", "currenttime","now is :"+ new Date().toString());
	// 发送记录
	producer.send(record,new Callback()
			{

				@Override
				public void onCompletion(RecordMetadata metadata, Exception exception) {
					System.out.println("sent succesfully."+metadata);
					
				}
		
			});
	
	producer.close();
}

}