java maven写入kafka消息demo

      org.apache.kafka
      kafka-clients
      0.11.0.2      

package com.demo;

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 java.util.Properties;


public class KafkaProducerTest {

    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost: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 producer = new KafkaProducer<>(props);
        int totalMessageCount = 10000;
        for (int i = 0; i < totalMessageCount; i++) {
            String value = String.format("%d,%s,%d", System.currentTimeMillis(), "machine-1", currentMemSize());
            producer.send(new ProducerRecord<>("flink-topic", value), new Callback() {
                @Override
                public void onCompletion(Recordmetadata metadata, Exception exception) {
                    if (exception != null) {
                        System.out.println("Failed to send message with exception " + exception);
                    }
                }
            });
            Thread.sleep(1000L);
        }
        producer.close();
    }

    private static long currentMemSize() {
        return MemoryUsageExtrator.currentFreeMemorySizeInBytes();
    }
}

辅助类：

package com.demo;


import com.sun.management.OperatingSystemMXBean;

import java.lang.management.ManagementFactory;

public class MemoryUsageExtrator {

    private static OperatingSystemMXBean mxBean =
            (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

    
    public static long currentFreeMemorySizeInBytes() {
        return mxBean.getFreePhysicalMemorySize();
    }
}

启动zookeeper和kafka，并创建主题flink-topic，启动消费者

zkServer.cmd

.binwindowskafka-server-start.bat .configserver.properties

.binwindowskafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic flink-topic

.binwindowskafka-console-consumer.bat --bootstrap-server localhost:9092 --topic flink-topic --from-beginning

启动程序，可以看到kafka消费者接收到的数据。