Kafka 0.8 Producer (0.9以前版本适用)

Kafka旧版本producer由scala编写，0.9以后已经废除，但是很多公司还在使用0.9以前的版本，所以总结如下：

要注意包Producer是 kafka.javaapi.producer.Producer 这个才是java api使用的包

示例代码如下：

import kafka.producer.KeyedMessage;

import kafka.javaapi.producer.Producer;

import kafka.producer.ProducerConfig;

import java.util.Properties;

public class ProducerDemo {

	public static void main(String[] args) {

		Properties properties = new Properties();

		properties.put("metadata.broker.list", "kafka01:9092,kafka02:9092");

		properties.put("serializer.class", "kafka.serializer.StringEncoder");

		properties.put("request.requird.acks", "1");

		ProducerConfig config = new ProducerConfig(properties);

		Producer<String, String> producer = new Producer<String, String>(config);

		KeyedMessage<String,String> msg = new KeyedMessage<String,String>("topic","key","hello");

		producer.send(msg);

	}

}

自定义partition示例代码如下：

import kafka.producer.Partitioner;

import kafka.utils.VerifiableProperties;

public class SimplePartitioner implements Partitioner {

    public SimplePartitioner (VerifiableProperties props) {

    }

    public int partition(Object key, int a_numPartitions) {

        int partition = 0;

        String stringKey = (String) key;

        int offset = stringKey.lastIndexOf('.');

        if (offset > 0) {

            partition = Integer.parseInt( stringKey.substring(offset+1)) % a_numPartitions;

        }

        return partition;

    }

}

更多实时计算，Kafka等相关技术博文，欢迎关注实时流式计算