之前项目用了kafka，当时多少有点仓促，看了一下简单的api直接使用了就，一直想着自己搭建一个简单的Demo，这个周末终于有时间搞了一下。话不多说，直接上代码吧。
pom.xml
<?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>2.4.2</version>
<relativePath/>
</parent>
<groupId>com.atyangjun</groupId>
<artifactId>sharding-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>sharding-demo</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</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>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.0.5</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
1、新建bean：
import lombok.Data;
import java.util.Date;
@Data
public class Message {
private Longid;
private Stringmsg;
private DatesendTime;
}
2、生产者service ：KafkaProService
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.SendResult;
import org.springframework.stereotype.Service;
import org.springframework.util.concurrent.ListenableFuture;
@Service
public class KafkaProService {
private static final LoggerLOG = LoggerFactory.getLogger(KafkaProService.class);
@Autowired
private KafkaTemplatekafkaTemplate;
@Value("${kafka.app.topic.foo}")
private Stringtopic;
public void send(String message) {
LOG.info("topic=" +topic +",message=" + message);
ListenableFuture> future =kafkaTemplate.send(topic, message);
future.addCallback(success ->LOG.info("KafkaMessageProducer 发送消息成功！"),
fail ->LOG.error("KafkaMessageProducer 发送消息失败！"));
}
}
3、消费者KafkaReceiver
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 KafkaReceiver {
@KafkaListener(topics = {"test"})
public void listen(ConsumerRecord record) {
Optional kafkaMessage = Optional.ofNullable(record.value());
if (kafkaMessage.isPresent()) {
Object message = kafkaMessage.get();
log.info("===消费者收到消息============");
log.info("消息=======:" + message);
}
}
}
4、KafkaProController
package com.atyangjun.shardingdemo.controller;
import com.atyangjun.shardingdemo.entity.Message;
import com.atyangjun.shardingdemo.service.KafkaProService;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Date;
import java.util.UUID;
@Controller
public class KafkaProController {
@Autowired
private KafkaProServicekafkaProService;
private Gsongson =new GsonBuilder().create();
private static final LoggerLOGGER = LoggerFactory.getLogger(KafkaProController.class);
@RequestMapping("sendMessage")
@ResponseBody
public String send(@RequestParam(required =true) String message) {
try {
kafkaProService.send(message);
}catch (Exception e) {
return "send failed";
}
return message;
}
@RequestMapping("sendBatch")
@ResponseBody
public String send2() {
for (int i =0; i <10; i++) {
try {
Message message =new Message();
message.setId(System.currentTimeMillis());
message.setMsg(UUID.randomUUID().toString());
message.setSendTime(new Date());
LOGGER.info("消费者发送消息 message = {}",gson.toJson(message));
String s =gson.toJson(message);
kafkaProService.send(s);
}catch (Exception e) {
return "send failed";
}
}
return "success";
}
}
5、application.properties 配置中心
#==kakfa配置
#spring.kafka.bootstrap-servers=127.0.0.1:9092
spring.kafka.bootstrap-servers=0.0.0.0:9092
#=========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
kafka.app.topic.foo=test
运行之后 在页面发送请求，一种单个message，一种批量任务。
如果小伙伴在运行期间有啥问题，可以留言一起解决哈，虽然一个简单的Demo，可是稍不注意 会有几个小坑呢🌈。
