一、環境要求
(項目源碼在最下方有鏈接)
操作系統:win10
JDK:1.7以上
kafka版本:kafka_2.12-1.0.0
Kafka官網下載:下載
選擇:kafka_2.12-1.0.0.tgz
zookeeper下載:下載
選擇:zookeeper-3.4.11.tar.gz(二進制)
二、環境搭建
1.JDK環境(過程略)
2.zookeeper環境
與jdk環境配置類似
a.解壓zookeeper壓縮包,找到該項目下conf目錄中的“zoo_sample.cfg”重 命名爲“zoo.cfg”,我的是在E:\Java\Tool\zookeeper-3.4.11\zookeeper-3.4.11
b.在任意文本編輯器(如notepad++,記事本)中打開zoo.cfg,
c. 找到並編輯dataDir=e://Java//Tool//tmp
添加環境變量:
ZOOKEEPER_HOME
變量值 E:\Java\Tool\zookeeper-3.4.11\zookeeper-3.4.11
Path:在末尾添加%ZOOKEEPER_HOME%\bin
測試:打開cmd,輸入zkServer(保持打開,以下還要用)
控制檯能打印出端口號,說明配置成功
三、kafka安裝與運行
1.解壓kafka的壓縮包,進入解壓包目錄,E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0,打開並修改config下的server.properties,修改log.dirs=E:/Java/tmp/kafka-log
2.在kafka安裝目錄即:E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0打開命令執行窗口,輸入
.\bin\windows\kafka-server-start.bat.\config\server.properties
(保持打開,以下還要用)
日誌中有個javax.management.MalformedObjectNameException: Invalid character ‘:’ in value part of property錯誤,可以忽略。
3.創建主題:
在kafka安裝目錄即:E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0打開命令執行窗口,輸入
.\bin\windows\kafka-topics.bat --create --zookeeper localhost:2181--replication-factor 1 --partitions 1 --topic topic1
(最後鍵名爲主題的名字)
(保持打開,以下還要用)
創建生產者
在kafka安裝目錄即:E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0打開命令執行窗口,輸入
.\bin\windows\kafka-console-producer.bat--broker-list localhost:9092 --topic topic1
(最後鍵名爲主題的名字)
(保持打開,以下還要用)
創建消費者
在kafka安裝目錄即:E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0打開命令執行窗口,輸入
.\bin\windows\kafka-console-consumer.bat--zookeeper localhost:2181 --topic topic1
(最後鍵名爲主題的名字)
在生產者中輸入任何信息,消費者能接收即爲部署成功。
總結步驟:
1.啓動zookeeper服務
zkServer
2.啓動kafka服務(kafka安裝目錄)
.\bin\windows\kafka-server-start.bat .\config\server.properties
3.創建主題(kafka安裝目錄)
.\bin\windows\kafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic topic1
4.創建生產者(kafka安裝目錄)
.\bin\windows\kafka-console-producer.bat --broker-list localhost:9092 --topic topic1
5.創建消費者(kafka安裝目錄)
.\bin\windows\kafka-console-consumer.bat --zookeeper localhost:2181 --topic topic1
四、JAVA項目整合實現
1.創建maven項目,修改pom文件
添加kafka的jar
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.8.2.1</version>
</dependency>
2.創建一個類充當配置文件
package com.chenx.demo.conf;
public interface KafkaProperties {
final static String zkConnect = "127.0.0.1:2181";
final static String groupId = "group1";
final static String topic = "topic1";
final static String kafkaServerURL = "127.0.0.1";
final static int kafkaServerPort = 9092;
final static int kafkaProducerBufferSize = 64 * 1024;
final static int connectionTimeOut = 20000;
final static int reconnectInterval = 10000;
final static String topic2 = "topic2";
final static String topic3 = "topic3";
final static String clientId = "SimpleConsumerDemoClient";
}
3.創建生產者
package com.chenx.demo.producer;
import java.util.Properties;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
public class KafkaProducer extends Thread {
private final kafka.javaapi.producer.Producer<Integer, String> producer;
private final String topic;
private final Properties props = new Properties();
public KafkaProducer(String topic)
{
props.put("serializer.class", "kafka.serializer.StringEncoder");
props.put("metadata.broker.list", "127.0.0.1:9092");
producer = new kafka.javaapi.producer.Producer<Integer, String>(new ProducerConfig(props));
this.topic = topic;
}
@Override
public void run() {
int messageNo = 1;
while (true)
{
String messageStr = new String("helloWord->" + messageNo);
System.out.println("Send:" + messageStr);
producer.send(new KeyedMessage<Integer, String>(topic, messageStr));
// System.out.println("topic:"+topic);
messageNo++;
try {
sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
4.創建生產者
package com.chenx.demo.consumer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import com.chenx.demo.conf.KafkaProperties;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
public class KafkaConsumer extends Thread {
private final ConsumerConnector consumer;
private final String topic;
public KafkaConsumer(String topic)
{
consumer = kafka.consumer.Consumer.createJavaConsumerConnector(
createConsumerConfig());
this.topic = topic;
}
private static ConsumerConfig createConsumerConfig()
{
Properties props = new Properties();
props.put("zookeeper.connect", KafkaProperties.zkConnect);
props.put("group.id", KafkaProperties.groupId);
props.put("zookeeper.session.timeout.ms", "40000");
props.put("zookeeper.sync.time.ms", "200");
props.put("auto.commit.interval.ms", "1000");
return new ConsumerConfig(props);
}
@Override
public void run() {
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(topic, new Integer(1));
Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
KafkaStream<byte[], byte[]> stream = consumerMap.get(topic).get(0);
ConsumerIterator<byte[], byte[]> it = stream.iterator();
while (it.hasNext()) {
System.out.println("receive:" + new String(it.next().message()));
try {
sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
5.創建客戶端啓動程序
package com.chenx.demo.client;
import com.chenx.demo.conf.KafkaProperties;
import com.chenx.demo.consumer.KafkaConsumer;
import com.chenx.demo.producer.KafkaProducer;
public class KafkaClient {
public static void main(String[] args) {
KafkaProducer producerThread = new KafkaProducer(KafkaProperties.topic);
producerThread.start();
KafkaConsumer consumerThread = new KafkaConsumer(KafkaProperties.topic);
consumerThread.start();
}
}
6.啓動zookeeper和kafka服務
cmd輸入zkServer,
在kafka安裝目錄即:E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0打開命令執行窗口,輸入
.\bin\windows\kafka-server-start.bat.\config\server.properties
同上
運行KafkaClient類
控制檯正常打印出內容
項目結構和最後結果圖
爲了能更直接的體現消費者和生產者模型,可以通過windows的控制檯啓動消費者,java項目不啓動消費者。
下面修改代碼,註解掉 consumerThread.start();
package com.chenx.demo.client;
import com.chenx.demo.conf.KafkaProperties;
import com.chenx.demo.consumer.KafkaConsumer;
import com.chenx.demo.producer.KafkaProducer;
public class KafkaClient {
public static void main(String[] args) {
KafkaProducer producerThread = new KafkaProducer(KafkaProperties.topic);
producerThread.start();
// KafkaConsumer consumerThread = new KafkaConsumer(KafkaProperties.topic);
// consumerThread.start();
}
}
啓動消費者服務
在kafka安裝目錄即:E:\Java\Tool\kafka_2.12-1.0.0\kafka_2.12-1.0.0打開命令執行窗口,輸入
.\bin\windows\kafka-console-producer.bat--broker-list localhost:9092 --topic topic1
項目源碼
tip:關掉kafka服務,重啓之後再創建主題topic1時會顯示已存在的消息,這個時候可以直接跳過進入創建生產者的步驟,或者刪除kafka日誌目錄下的東西、tmp/kafka-log,重啓kafka服務,就能重新創建topic1,或者用其他方法刪除topic,我還在學習。
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