Springboot集成kafka

布满荆棘的人生 2022-02-24 00:56 303阅读 0赞

**一.kafka在mac环境下的安装**

1.安装kafka

$brew install kafka

上面安装过程中已经自动安装了zookeeper

2.软件位置

/usr/local/Cellar/zookeeper
    /usr/local/Cellar/kafka

3.配置文件位置

/usr/local/etc/kafka/zookeeper.properties
    /usr/local/etc/kafka/server.properties

备注：后续操作均需进入 /usr/local/Cellar/kafka/1.0.0/bin 目录下。

4.启动zookeeper

zookeeper-server-start /usr/local/etc/kafka/zookeeper.properties &

5.启动kafka服务

kafka-server-start /usr/local/etc/kafka/server.properties &

6.创建topic

kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test1

7.查看创建的topic

kafka-topics --list --zookeeper localhost:2181

8.生产数据

kafka-console-producer --broker-list localhost:9092 --topic test1

9.消费数据

kafka-console-consumer --bootstrap-server 127.0.0.1:9092 --topic test1 --from-beginning

备注：–from-beginning 将从第一个消息开始接收

**二.springboot集成kafka**

1.pom文件依赖

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.1.3.RELEASE</version>
    		<relativePath/>
    	</parent>
    	<groupId>com.ligh</groupId>
    	<artifactId>Springboot-kafka</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>Springboot-kafka</name>
    	<properties>
    		<java.version>1.8</java.version>
    	</properties>
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.projectlombok</groupId>
    			<artifactId>lombok</artifactId>
    			<optional>true</optional>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.kafka</groupId>
    			<artifactId>spring-kafka</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>com.google.code.gson</groupId>
    			<artifactId>gson</artifactId>
    			<version>2.8.2</version>
    		</dependency>
    	</dependencies>
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    </project>

2.在配置文件application.properties中添加以下配置

#============== kafka ===================
    # 指定kafka 代理地址，可以多个
    spring.kafka.bootstrap-servers=127.0.0.1:9092
    
    #=============== provider  =======================
    spring.kafka.producer.retries=0
    # 每次批量发送消息的数量
    spring.kafka.producer.batch-size=16384
    spring.kafka.producer.buffer-memory=33554432
    
    # 指定消息key和消息体的编解码方式
    spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
    spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
    
    #=============== consumer  =======================
    # 指定默认消费者group id
    spring.kafka.consumer.group-id=test-consumer-group
    
    spring.kafka.consumer.auto-offset-reset=earliest
    spring.kafka.consumer.enable-auto-commit=true
    spring.kafka.consumer.auto-commit-interval=100
    
    # 指定消息key和消息体的编解码方式
    spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
    spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

3.创建一个实体类Message

import lombok.Data;
    import java.util.Date;
    @Data
    public class Message {
    
        private Long id;     //id
    
        private String msg;  //消息
    
        private Date sendTime; //时间戳
        
    }

4.创建生产者端

import com.google.gson.Gson;
    import com.google.gson.GsonBuilder;
    import com.ligh.domain.Message;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.kafka.core.KafkaTemplate;
    import org.springframework.stereotype.Component;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import java.util.Date;
    import java.util.UUID;
    @Component
    @Slf4j
    @Controller
    public class KafkaProducer {
    
        @Autowired
        private KafkaTemplate<String,String> kafkaTemplate;
        private Gson gson = new GsonBuilder().create();
    
        //发送消息
        @RequestMapping("send")
        @ResponseBody
        public String send(){
            Message message = new Message();
            message.setId(System.currentTimeMillis());
            message.setMsg(UUID.randomUUID().toString());
            message.setSendTime(new Date());
            System.out.println("+++++++++++  message = {}" +(gson.toJson(message)));
            kafkaTemplate.send("ligh",gson.toJson(message));
            return "success";
        }
    }

5.创建消费者端

import lombok.extern.slf4j.Slf4j;
    import org.apache.kafka.clients.consumer.ConsumerRecord;
    import org.springframework.kafka.annotation.KafkaListener;
    import org.springframework.stereotype.Component;
    import java.util.Optional;
    
    @Component
    @Slf4j
    public class KafkaConsumer {
        @KafkaListener(topics = {"ligh"})
        public void listen(ConsumerRecord<?,?> record){
            Optional<?> kafkaMessage = Optional.ofNullable(record.value());
            if(kafkaMessage.isPresent()){
                Object message = kafkaMessage.get();
                System.out.println("--------- recode = "+record);
                System.out.println("--------- message = "+message);
            }
        }
    }

**三.测试**

1.访问localhost:8080/send进行生产者生产消息

![在这里插入图片描述][20190402163617887.png]  
2.查看控制台消费者是否消费到了消息

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpZ2hfc3Fo_size_16_color_FFFFFF_t_70]

以上就完成了kafka的安装到集成到springboot中的过程。

[20190402163617887.png]: /images/20220224/018ab55491a642f88d29225aaa6751ed.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpZ2hfc3Fo_size_16_color_FFFFFF_t_70]: /images/20220224/3db9d6e368d94c2db7ad36fd206f60c1.png