kafka安装使用

版本：kafka_2.11-0.10.1.0 (之前安装2.10-0.10.0.0，一直出问题)

安装
Springboot结合Kafka的使用

安装

下载并解压代码

wget http://mirrors.cnnic.cn/apache/kafka/0.10.0.0/kafka_2.10-0.10.0.0.tgz
#http://kafka.apache.org/downloadstar -zxvf kafka_2.10-0.10.0.0.tgz

cd kafka_2.10-0.10.0.0

修改每个broker安装目录下的配置文件

# $targetID默认是0，每个broker的broker.id必须要唯一
broker.id=$targetID#默认是注释的,$IP改成当前节点的IP即可。如果不改该配置项，在节点通过命令行可以收发消息，而在其他机器是无法通过IP去访问队列的
#在之前的版本不叫listeners，而是advertised.host.name和host.name
listeners=PLAINTEXT://$IP:9092

启动服务

#kafka依赖于zookeeper
#如果没有的话，可以通过kafka提供的脚本快速创建一个单节点zookeeper实例：
#bin/zookeeper-server-start.sh config/zookeeper.properties#确认zookeeper服务已经启动后，启动kafka服务
nohup bin/kafka-server-start.sh config/server.properties &

创建一个名为test，有一份备份，一个分区的topic

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
#查看所有topicbin/kafka-topics.sh --list --zookeeper localhost:2181

发送消息

bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test

开启一个消费者接收消息

bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning

查看topic信息

bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic test

Springboot结合Kafka的使用

1.在pom文件添加依赖

<dependency><groupId>org.springframework.kafka</groupId><artifactId>spring-kafka</artifactId>
</dependency>

2.在application.properties中添加配置

# APACHE KAFKA (KafkaProperties)
spring.kafka.bootstrap-servers=192.168.0.155:9092,192.168.0.156:9092
spring.kafka.client-id=K1
spring.kafka.consumer.auto-offset-reset= earliest
spring.kafka.consumer.enable-auto-commit= true
spring.kafka.consumer.group-id= test-consumer-group
spring.kafka.producer.batch-size=2
spring.kafka.producer.bootstrap-servers= 192.168.0.155:9092,192.168.0.156:9092
spring.kafka.producer.client-id= P1
spring.kafka.producer.retries=3
spring.kafka.template.default-topic= test

3.创建消费者类(订阅消息的对象)

import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;@Component
public class ListenerBean {@KafkaListener(topics = "myTopic")public void processMessage(String content) {System.out.println("you have a new message:" + content);// ...
    }
}

4.创建生产者类(发布消息的对象)

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;@Component
@RestController
@RequestMapping("/send")
@EnableAutoConfiguration
public class SendMsgBean {private final KafkaTemplate<String,String> kafkaTemplate;@Autowiredpublic SendMsgBean(KafkaTemplate<String,String> kafkaTemplate) {this.kafkaTemplate = kafkaTemplate;}@RequestMapping(path="/{msg}",method=RequestMethod.GET)public String send(@PathVariable("msg") String msg) {System.out.println("==sending msg:" + msg);kafkaTemplate.send("test","test-"+msg);return "message has been sent!";}
}