springboot与kafka的实例

一、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 https://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>2.1.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.citydo</groupId>
    <artifactId>kafka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>kafka</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-streams</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

二、配置

server.port=8999
spring.kafka.bootstrapServers=192.168.0.195:9092
spring.kafka.consumer.groupId=Group
spring.kafka.consumer.keyDeserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.valueDserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.groupId=Group
spring.kafka.producer.keyDeserializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.valueDserializer=org.apache.kafka.common.serialization.StringSerializer

三、参数

package com.citydo.kafka;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString
public class PayMessage {
    private String orderCode;
    private Float fee;
    private Long sendTime;
}

四、消费者

package com.citydo.kafka;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Service;


@Service
@Slf4j
public class MessageConsumer {
    public static final String PAY_TOPIC = "payTopic";

    private Gson gson = new GsonBuilder().create();

    @KafkaListener(topics = PAY_TOPIC)
    public void onMessage(String payMessage) {
        PayMessage msg = gson.fromJson(payMessage, PayMessage.class);
        log.info("msg"+msg);
    }
}

五、生产者

package com.citydo.kafka;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;


@Component
@Slf4j
public class MessageProducer {

    public static final String PAY_TOPIC = "payTopic";

    @Autowired
    private KafkaTemplate kafkaTemplate;

    private Gson gson = new GsonBuilder().create();

    public void send(PayMessage payMessage) {
        String msg = gson.toJson(payMessage);
        kafkaTemplate.send(PAY_TOPIC, msg);
        log.info("msg"+msg);
    }

}

六、启动

package com.citydo.kafka;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import java.util.UUID;

@SpringBootApplication
@Slf4j
public class KafkaApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(KafkaApplication.class, args);
        //发送消息
        MessageProducer producer = applicationContext.getBean(MessageProducer.class);
        while (true){
            PayMessage message = new PayMessage();
            message.setFee((float) System.currentTimeMillis());
            message.setOrderCode(UUID.randomUUID().toString());
            message.setSendTime(System.currentTimeMillis());
            producer.send(message);
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
               log.info("{}",e.getMessage());
            }
        }
    }

}

最后

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