springboot整合kafka
1、配置pom.xml
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<?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>
<groupId>cn.itfeiyue.kafka</groupId>
<artifactId>springboot-kafka</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot-kafka</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<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.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>2.1.1.RELEASE</version>
</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>
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2、编写消息实体类 Message.java
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package cn.itfeiyue.kafka.springbootkafka.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
/**
* @Description: 消息实体类
* @Author: ZHANGPENGFEI
* @CreateDate: 2018/5/21 15:20
* @Version: 1.0
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Message {
private Long id;//id
private String msg;//消息
private Date sendTime;//时间戳
}
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3、消息发送类 KafkaSender.java
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package cn.itfeiyue.kafka.springbootkafka.sender;
import cn.itfeiyue.kafka.springbootkafka.pojo.Message;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.UUID;
/**
* @Description: 消息发送类
* @Author: ZHANGPENGFEI
* @CreateDate: 2018/5/21 15:25
* @Version: 1.0
*/
@Component
@Slf4j
public class KafkaSender {
@Autowired
private KafkaTemplate kafkaTemplate;
private Gson gson = new GsonBuilder().create();
//发送消息的方法
public void send(){
Message message = new Message();
message.setId(System.currentTimeMillis());
message.setMsg(UUID.randomUUID().toString());
message.setSendTime(new Date());
log.info("+++++++++++++++++++++ message = {}",gson.toJson(message));
kafkaTemplate.send("feiyue",gson.toJson(message));
}
}
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这里关键的代码为 kafkaTemplate.send() 方法，feiyue是 Kafka 里的 topic ，这个 topic 在 Java 程序中是不需要提前在 Kafka 中设置的，因为它会在发送的时候自动创建你设置的 topic
4、消息接收类 KafkaReceiver.java
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package cn.itfeiyue.kafka.springbootkafka.receiver;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.internals.Topic;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;
import java.util.Optional;
import java.util.function.Consumer;
/**
* @Description: 消息接受者
* @Author: ZHANGPENGFEI
* @CreateDate: 2018/5/21 15:38
* @Version: 1.0
*/
@Component
@Slf4j
public class KafkaReceiver {
@KafkaListener(topics={"feiyue"})
public void listen(ConsumerRecord<?,?> record){
Optional<?> kafkaMessage = Optional.ofNullable(record.value());
if (kafkaMessage.isPresent()){
Object message = kafkaMessage.get();
log.info("----------------- record =" + record);
log.info("------------------ message =" + message);
}
}
}
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5、编写测试类
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package cn.itfeiyue.kafka.springbootkafka;
import cn.itfeiyue.kafka.springbootkafka.sender.KafkaSender;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootKafkaApplicationTests {
@Autowired
KafkaSender kafkaSender;
@Test
public void contextLoads() {
for (int i=0;i<3;i++){
//调用消息发送类中的发送方法
kafkaSender.send();
try {
Thread.sleep(3000);
}catch (Exception e){
e.printStackTrace();
}
}
}
}
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6、相关配置为：
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#============== kafka ===================
# 指定kafka 代理地址，可以多个
spring.kafka.bootstrap-servers=192.168.52.128:9092
#=============== 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
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7、效果如下：