目录
1、安装kafka
1.1确认jdk是否安装OK
1.2下载&&安装kafka
1.3验证kafka
2、连接kafka
3、在java中操作kafka
1、安装kafka
1.1确认jdk是否安装Ok
java -version
1.2下载&&安装kafka
wget http://archive.apache.org/dist/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz
mkdir zk-3.4.14
tar -xvzf zookeeper-3.4.14.tar.gz -C /home/lighthouse/zk-3.4.14
配置
进入该目录下的conf文件夹中。
zoo_sample.cfg是一个配置文件的样本，需要将这个文件复制并重命名为zoo.cfg:
cp zoo_sample.cfg zoo.cfg
修改配置文件：
vi zoo.cfg
配置环境变量, 使用vim打开etc目录下的profile文件：vim /etc/profile
在末尾配置环境变量，这里需要写入的是：
export ZOOKEEPER_HOME=/home/lighthouse/zk-3.4.14/zookeeper-3.4.14
export PATH=$PATH:$ZOOKEEPER_HOME/bin
写入信息并保存后，需要使配置文件生效，所用的命令为：source /etc/profile
启动zookeeper, 由于配置了环境变量，可以在系统中的任意目录执行启动zookeeper的命令，其执行的实际上是zookeeper的bin文件夹中的zkServer.sh的命令：zkServer.sh start
Zookeeper启动成功：
下载kafka2.2.1：
wget https://archive.apache.org/dist/kafka/2.2.1/kafka_2.12-2.2.1.tgz
解压：
tar -zxvf kafka_2.12-2.2.1.tgz
启动：
nohup bin/kafka-server-start.sh config/server.properties > output.txt &
其中server.properties文件内容如下：
1.3验证kafka
执行命令：bin/kafka-topics.sh –version
看不到版本号
2、连接kafka，并执行命令
2.1创建topic：执行命令：
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
2.2查看topic：执行命令：
bin/kafka-topics.sh --list --zookeeper localhost:2181
bin/kafka-topics.sh --list --zookeeper 43.138.0.199:2181
2.3使用kafka-console-producer.sh 发送消息：
bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
bin/kafka-console-producer.sh --broker-list 43.138.0.199:9092 --topic test
2.4使用kafka-console-consumer.sh消费消息：
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
bin/kafka-console-consumer.sh --bootstrap-server 43.138.0.199:9092 --topic test --from-beginning
3、在java中操作kafka
pom.xml增加如下依赖：
<dependencies><dependency><groupId>org.apache.kafka</groupId><artifactId>kafka_2.11</artifactId><version>1.0.1</version></dependency><dependency><groupId>org.apache.kafka</groupId><artifactId>kafka-clients</artifactId><version>1.0.1</version></dependency></dependencies>Producer.java代码如下：
package com.hmblogs.backend.util;import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;
import org.apache.log4j.Logger;import java.util.Properties;/************************************************************ @ClassName : Producer.java****** @author : milo ^ ^****** @date : 2018 03 14 11:34****** @version : v1.0.x*******************************************************/
public class Producer {static Logger log = Logger.getLogger(Producer.class);private static final String TOPIC = "test";private static final String BROKER_LIST = "43.138.0.199:9092";private static KafkaProducer<String,String> producer = null;/*初始化生产者*/static {Properties configs = initConfig();producer = new KafkaProducer<String, String>(configs);}/*初始化配置*/private static Properties initConfig(){Properties properties = new Properties();properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,BROKER_LIST);properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,StringSerializer.class.getName());return properties;}public static void main(String[] args) throws InterruptedException {//消息实体ProducerRecord<String , String> record = null;for (int i = 0; i < 3; i++) {record = new ProducerRecord<String, String>(TOPIC, "value"+(int)(10*(Math.random())));//发送消息producer.send(record, new Callback() {@Overridepublic void onCompletion(RecordMetadata recordMetadata, Exception e) {if (null != e){System.out.println("send error" + e.getMessage());}else {System.out.println(String.format("offset:%s,partition:%s",recordMetadata.offset(),recordMetadata.partition()));}}});}producer.close();}
}执行报错，如下：
send errorExpiring 3 record(s) for test-0: 30034 ms has passed since batch creation plus linger time
send errorExpiring 3 record(s) for test-0: 30034 ms has passed since batch creation plus linger time
send errorExpiring 3 record(s) for test-0: 30034 ms has passed since batch creation plus linger time
搜索资料，尝试解决
