spring boot 与kafka集成的示例代码

新建spring boot项目

这里使用intellij IDEA

添加kafka集成maven

<?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.example</groupId>
  <artifactId>demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>demo</name>
  <description>Demo project for Spring Boot</description>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.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.kafka</groupId>
      <artifactId>spring-kafka</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-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>

项目中application.properties 添加

spring.kafka.bootstrap-servers=vm208:9092,vm:9092,vm50:9092
spring.kafka.consumer.auto-offset-reset=latest
spring.kafka.consumer.group-id=local_test
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.acks=1

新建KafkaConsumer消费类

package com.example.demo.consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;
@Component
public class KafkaConsumer {

  private Logger logger = LoggerFactory.getLogger(this.getClass());

  @KafkaListener(topics = {"test"})
  public void listen(ConsumerRecord<?, ?> record) {
    System.out.printf("offset = %d,key =%s,value=%s\n", record.offset(), record.key(), record.value());
  }
}

启动spring-boot程序,在kafka集群,模拟发送topic,检验接收

代码如下:

bin/kafka-console-producer.sh --broker-list    vm208:9092,vm210:9092,vm50:9092  --topic  test

编写producer代码

package com.example.demo.producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;
@Component
public class KafkaProducer {

  @Autowired
  private KafkaTemplate kafkaTemplate;
  String topic="test";
  public void sendMessage(String key,String data){
    kafkaTemplate.send(new ProducerRecord(topic,key,data));
  }
}

建立一个restful模拟发送( //http://localhost:8080/kafka/send.do?key=2&data=allen-test-message)

package com.example.demo.controller;
import com.example.demo.producer.KafkaProducer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ProducerController {
  @Autowired
  private KafkaProducer kafkaProducer;
  @RequestMapping(value = "/kafka/send.do", method = RequestMethod.GET)
  public String sendMessage(@RequestParam(value = "key") String key, @RequestParam(value = "data") String data) {
    kafkaProducer.sendMessage(key, data);
    return "sucess";
  }
}

可以发现 spring-kafka大大减少了代码工作量.

官方文档: https://docs.spring.io/spring-kafka/docs/1.2.2.RELEASE/reference/html/

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