#Kafka的安装以及配置，本文是自己学习备用，有不足的地方请到网上寻找其他方法。
wget http://mirror.bit.edu.cn/apache/kafka/0.11.0.0/kafka_2.11-0.11.0.0.tgz
2.安装
tar xzvf kafka_2.11-0.11.0.0.tgz -C /usr/local/
3.配置(服务器在阿里云ECS上)
vi %kafka_home%/server.properties
############################# Server Basics #############################
broker.id=0
port=9092
host.name=阿里云内网ip
advertised.host.name=阿里云外网ip
delete.topic.enable=true
…其他的配置不变
二Spring boot操作Kafka
1、pom 文件代码如下：
代码如下（示例）：
<?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>com.zhisheng</groupId>
<artifactId>kafka-learning</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>kafka-learning</name>
<description>Demo project for Spring Boot + kafka</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.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.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>
<version>1.1.1.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>
主要引入了 spring-kafka 、lombok 、 gson 依赖。
再看一下对应的配置文件:
spring.application.name=kafka-user
server.port=8080
#============== kafka ===================
# 指定kafka 代理地址，可以多个
spring.kafka.bootstrap-servers=localhost: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=user-log-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
yml配置文件,本例为kafka节点集群
spring:
kafka:
bootstrap-servers: http://master:9092,http://worker1:9092,http://worker2:9092
producer:
retries: 0
batch-size: 16384
buffer-memory: 33554432
key-serializer: org.apache.kafka.common.serialization.StringSerializer
value-serializer: org.apache.kafka.common.serialization.StringSerializer
message消息实体类
代码如下（示例）：
@Data
public class Message {
private Long id; //id
private String msg; //消息
private Date sendTime; //时间戳
}
生产者
@Component
@Slf4j
public class KafkaProducer {
@Autowired
private KafkaTemplate<String, String> kafkaTemplate;
private Gson gson = new GsonBuilder().create();
//发送消息方法
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));
//topic-ideal为主题
kafkaTemplate.send("topic-ideal", gson.toJson(message));
}
}
测试类,运行kafkaProducer方法即可
@RunWith(SpringRunner.class)
@SpringBootTest
public class KafkaProducerApplicationTests {
@Autowired
private KafkaProducer kafkaProducer;
@Test
public void kafkaProducer(){
this.kafkaProducer.send();
}
@Test
public void contextLoads() {
}
}
消费者类
@Component
@Slf4j
public class KafkaConsumer {
@KafkaListener(topics = {
"topic-ideal"})
public void consumer(ConsumerRecord<?, ?> record){
Optional<?> kafkaMessage = Optional.ofNullable(record.value());
if (kafkaMessage.isPresent()) {
Object message = kafkaMessage.get();
log.info("----------------- record =" + record);
log.info("------------------ message =" + message);
}
}
}